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This chapter describes how to configure the ATM module interface and how to configure LAN emulation clients (LECs) for LAN emulation (LANE). Setting up LECs allows the Catalyst 5000 series switch to operate in an ATM LAN environment containing Cisco 7000 series routers with ATM Interface Processors (AIP) connected to Cisco LightStream ATM switches. LANE requires software version 3.1 or later on the Cisco LightStream ATM switch.
If an ATM module is installed in the Catalyst 5000, you can open a session with the ATM module. To open a session with the ATM module use the session mod_num command from the Console> prompt. The switch prompts you for a password. At this point, you are at the ATM> prompt, and you have direct access to only the ATM module that you have established a session with.
The ATM module uses a subset of the Internetwork Operating System (IOS) software. Generally, the IOS software works the same on the ATM module as it does on routers. Refer to the "ATM Module Command Line Interface" section of this document for information about using the ATM module command line interface.
To enter configuration mode, enter the EXEC command configure at the privileged-level EXEC prompt. The ATM module responds with the following prompt asking you to specify the terminal, nonvolatile memory (NVRAM) or a file stored on a network server as the source of configuration commands:
Configuring from terminal, memory, or network [terminal]?
Terminal configuration means changing the runtime configuration, which can be saved into the NVRAM. Configuring from memory means that the runtime configuration is updated from the NVRAM. Configuring from network means that the runtime configuration is updated from a file in a server on the network. Each of these three methods is described in the next two sections.
The ATM module accepts one configuration command per line. You can enter as many configuration commands as you want.
You can add comments to a configuration file describing the commands you have entered. Precede a comment with an exclamation point (!). Comments are not stored in NVRAM or in the active copy of the configuration file. In other words, comments do not appear when you list the active configuration with the write terminal EXEC command or list the configuration in NVRAM with the show configuration EXEC command. Comments are stripped out of the configuration file when it is loaded to the ATM module.
To configure the ATM module from the terminal, complete the following steps:
| Task | Command |
|---|---|
| Step 1 Enter configuration mode, selecting the terminal option. | configure terminal |
| Step 2 Enter the necessary configuration commands. | See appropriate chapter for specific commands. |
| Step 3 Quit configuration mode. | Ctrl-Z |
| Step 4 Save the configuration file modifications to NVRAM. | write memory |
In the following example, the ATM module is configured from the terminal. The interface atm 0 command is issued to designate that atm interface 0 is to be configured. Then, the lane client ethernet vlan# elan-name command is issued to link VLAN 1 to the manufacturing (man) ELAN. By pressing Ctrl-Z, the user quits configuration mode. The write memory command loads the configuration changes into NVRAM on the ATM module.
ATM# configure terminal ATM (config)# interface atm 0 ATM (config)# lane client ethernet 1 man Ctrl-Z ATM (config)# write memory
Nonvolatile memory stores the current configuration information in text format as configuration commands, recording only nondefault settings. The memory is checksummed to guard against corrupted data.
As part of its startup sequence, the ATM module startup software always checks for configuration information in NVRAM. If NVRAM holds valid configuration commands, the ATM module executes the commands automatically at startup. If the ATM module detects a problem with the nonvolatile memory or the configuration it contains, the card goes into default configuration. Problems can include a bad checksum for the information in NVRAM or the absence of critical configuration information.
You can configure the ATM module from NVRAM by reexecuting the configuration commands stored in NVRAM. To do so, complete the following step in EXEC mode:
| Task | Command |
|---|---|
| Configure the ATM module from NVRAM. | configure memory |
The implementation of LANE makes an ATM interface look like one or more Ethernet interfaces.
LANE is an ATM service defined by the ATM Forum specification "LAN Emulation over ATM," ATM_FORUM 94-0035. This service emulates the following LAN-specific characteristics:
LANE service provides connectivity between ATM-attached devices and LAN-attached devices. This includes connectivity between ATM-attached stations and LAN-attached stations, as well as connectivity between LAN-attached stations across an ATM network.
Because LANE connectivity is defined at the MAC layer, upper-protocol layer functions of LAN applications can continue unchanged when the devices join Emulated LANs (ELANs). This feature protects corporate investments in legacy LAN applications.
An ATM network can support multiple independent ELANs. Membership of an end system in any of the ELANs is independent of the physical location of the end system. This characteristic simplifies hardware moves and changes. In addition, the end systems can move easily from one ELAN to another, independent from hardware moves.
In this release, Cisco supports only emulated Ethernet LANs. This release does not support emulation of Token Ring networks.
This release of LANE is supported on Catalyst 5000 series switches containing ATM modules and on Cisco routers with ATM interfaces installed; it requires an ATM switch that supports UNI 3.0 and point-to-multipoint signaling--for example, the Cisco LightStream family of ATM switches.
An unlimited number of ELANs can be set up in an ATM switch cloud. A Catalyst 5000 ATM module can participate in multiple ELANs.
LANE is defined on a client-server LAN model as follows:
The LECS database can have the following four types of entries:
Communication among LANE components is ordinarily handled by several types of switched virtual circuits (SVCs). Some SVCs are unidirectional; others are bidirectional. Some are point-to-point and others are point-to-multipoint. Figure 5-1 illustrates the various types of SVCs.
The following section describes LANE Operation and Communication processes, starting with a LEC requesting to join an ELAN after the component Catalyst 5000 series switches have been installed.
The following process (illustrated in Figure 5-1) normally occurs after a LEC has been enabled on the ATM module in a Catalyst 5000 series switch:
As communication occurs on the ELAN, each LEC dynamically builds a local LANE ARP (LE ARP) table. A LEC's LE ARP table can also have static, preconfigured entries. The LE ARP table maps MAC addresses to ATM addresses.
When a LEC first joins an ELAN, its LE ARP table has no dynamic entries, and the LEC has no information about destinations on or behind its ELAN. To learn about a destination when a packet is to be sent, the LEC begins the following process to find the ATM address corresponding to the known MAC address:
Step 1 The LEC sends an LE ARP request to the LES for this ELAN (point-to-point Control Direct VCC, link 1-7 in Figure 5-1).
Step 2 If the MAC address is registered with the LES, it returns the corresponding ATM address. If not, the LES forwards the LE ARP request to all LECs on the ELAN (point-to-multipoint Control Distribute VCC, link 2-8 in Figure 5-1).
Step 3 Any LEC that recognizes the MAC address responds with its ATM address (point-to-point Control Direct VCC, link 1-7 in Figure 5-1).
Step 4 The LES forwards the response (point-to-multipoint Control Distribute VCC, link 2-8 in Figure 5-1).
Step 5 The LEC adds the MAC address-ATM address pair to its LE ARP cache.
Step 6 The LEC can establish a VCC to the desired destination and transmit packets to that ATM address (bidirectional point-to-point Data Direct VCC, link 6-6 in Figure 5-1).
For unknown destinations, the LEC sends a packet to the BUS, which forwards the packet to all LECs. The BUS floods the packet because the destination might be behind a bridge that has not yet learned this particular address.
When a LEC has broadcast or multicast traffic, or unicast traffic with an unknown address to send, the following process occurs:
This VCC branches at each ATM switch. The switch forwards such packets to multiple outputs. (The switch does not examine the MAC addresses; it simply forwards all packets it receives.)
On a LAN, packets are addressed by the MAC-layer addresses of the destination and source stations. To provide similar functionality for LANE, MAC-layer addressing must be supported. Every LEC must have a MAC address. In addition, every LANE component (LECS, LES, BUS, and LEC) must have a unique ATM address.
In this release, all LECs on the same interface have the same, automatically assigned MAC address. That MAC address is also used as the end-system identifier (ESI) part of the ATM address, as explained in the following section. Although LEC MAC addresses are not unique, all ATM addresses are unique.
A LANE ATM address has the same syntax as an NSAP, but it is not a network-level address. It consists of the following:
Cisco provides the following standard method of constructing and assigning ATM and MAC addresses for use in a LECS database. A pool of MAC addresses is assigned to each ATM module. The pool contains 16 MAC addresses. For constructing ATM addresses, the following assignments are made to the LANE components:
Because the LANE components are defined on different subinterfaces of an ATM interface, the value of the selector field in an ATM address is different for each component. The result is a unique ATM address for each LANE component, even within the same Catalyst 5000 series switch. For more information about assigning components to subinterfaces, see the "Assigning Components to Interfaces and Subinterfaces" section later in this chapter.
For example, if the MAC addresses assigned to an interface are 0800.200C.1000 through 0800.200C.100F, the ESI part of the ATM addresses are assigned to LANE components as follows:
Refer to the example sections "Configuring Multiple ELANs with Unrestricted Membership" and "Configuring Multiple ELANs with Restricted Membership" later in this chapter for examples using MAC address values as ESI field values in ATM addresses, and for examples using subinterface numbers as Selector field values in ATM addresses.
ATM address templates can be used in many LANE commands that assign ATM addresses to LANE components (thus overriding automatically assigned ATM addresses), or that link LEC ATM addresses to ELANs. The use of templates can greatly simplify the use of these commands. The syntax of address templates, the use of address templates, and the use of wildcard characters within an address template for LANE are very similar to those of address templates for ISO CLNS.
LANE ATM address templates can use two types of wildcards: an asterisk (*) to match any single character, and an ellipsis (...) to match any number of leading or trailing characters.
In LANE, a prefix template explicitly matches the prefix but uses wildcards for the ESI and selector fields. An ESI template explicitly matches the ESI field but uses wildcards for the prefix and selector. Table 5-1 indicates how the values of unspecified bytes are determined when an ATM address template is used.
| Unspecified Digits | Where to Obtain Value |
|---|---|
| Prefix (first 13 bytes) | ATM switch via ILMI, or configured locally if ILMI is not supported on the ATM switch. |
| ESI (next 6 bytes) | Slot MAC address1 plus
|
|
Selector field (last 1 byte) | Subinterface number, in the range 0 through 255. |
The following rules apply to assigning LANE components on the major ATM interface and its subinterfaces:
The Catalyst 5000 ATM module uses ILMI registration to build its ATM address and to register this address with the ATM switch. To build its ATM address, the Catalyst 5000 obtains its ATM address prefix from the ATM switch. Then it combines the ATM address prefix with its own MAC address and the LEC subinterface number. Once the Catalyst ATM module has determined its ATM address, it uses ILMI registration to register this address with the ATM switch.
Using the atm vc-per-vp command, you can configure the maximum number of VCIs per VPI. If this value is configured, when the Catalyst 5000 ATM module registers with the ATM switch, the maximum number of VCIs per VPI is also passed to the ATM switch. In this way, the ATM switch will not assign a VCI value for an SVC to the Catalyst 5000 that is out of the ATM switch's range. The default is 10 VCI bits, and 0 VPI bits on the Catalyst 5000 ATM module. Any change from the default requires an ATM module reset.
On the Catalyst 5000 series switch, a VLAN is a logical group of end stations, independent of physical location, with a common set of requirements. Currently, the Catalyst 5000 series switch supports a port-centric VLAN configuration. All end stations connected to ports belong to the same VLAN and are assigned to the same VLAN number. The VLAN number is only significant to the Catalyst 5000 series switch.
On an ATM network, an emulated LAN is called an ELAN and is designated by a name. To create a VLAN that spans multiple Catalyst 5000 series switches on an ATM network, you must assign the VLAN on each Catalyst 5000 series switch to the same ELAN. Use the lane client ethernet vlan# elan-name command to link the VLAN number with the ELAN name. You must use a router to allow communication between two or more ELANs, whether they are on the same or on different Catalyst 5000 series switches.
In typical LANE cases, one or more Catalyst 5000 series switches or Cisco routers with ATM interfaces are attached to a Cisco LightStream ATM switch. For distributing multiple ELANs within a network, you can use Catalyst 5000 switches instead of Cisco routers with ATM interfaces to configure the LANE LECS, LES, and LANE BUS.
The physical layout and the physical components of an emulated network might not differ for the single and the multiple ELAN cases. The differences are in the software configuration for the number of ELANs and the assignment of LANE components to the different physical components.
In typical LANE cases using Catalyst 5000 series switches only, one or more Catalyst 5000 series switches are attached to a Cisco LightStream ATM switch. The Cisco LightStream ATM switch provides connectivity to the broader ATM network switch cloud. The Catalyst 5000 series switches are configured to support one or more ELANs. One of the Catalyst 5000 series switches is configured to perform the LECS functions. Another Catalyst 5000 series switch is configured to perform the LES function and the BUS function for each ELAN. (One Catalyst 5000 series switch can perform the LES and the BUS functions for several ELANs.) A Catalyst 5000 series switch can act as a LEC for one or more ELANs.
This section presents two scenarios using Catalyst 5000 series switches and a Cisco LightStream ATM switch. Figure 5-2 illustrates the use of four Catalyst 5000 series switches and one Cisco LightStream ATM switch; it illustrates both the single and the multiple ELAN cases.
In a single ELAN scenario, the LANE components might be assigned as follows:
In the multiple LAN scenario, one ATM switch and four Catalyst 5000 series switches are used, but multiple ELANs are configured. In the following scenario, three ELANs are configured on the four Catalyst 5000 series switches.
The LANE components are assigned as follows:
LANE configurations that use routers typically have one or more Catalyst 5000 series switches or Cisco routers with ATM interfaces attached to a Cisco LightStream ATM switch. The Cisco LightStream ATM switch provides connectivity to the broader ATM network switch cloud. The routers are configured to support one or more ELANs. One of the routers is configured to perform the LECS functions. A router is configured to perform the LES function and the BUS function for each ELAN. (One router can perform the LES and the BUS functions for several ELANs.) Routers and Catalyst 5000 series switches can act as a LEC for one or more ELANs.
This section presents two scenarios using a router, Catalyst 5000 series switches, and a Cisco LightStream ATM switch. Figure 5-3 illustrates this typical layout of one Cisco LightStream ATM switch, with a Cisco router and three Catalyst 5000 series switches; it illustrates both the single and the multiple ELAN cases.
In a single ELAN scenario, the LANE components might be assigned as follows:
Refer to the "Configuring a Single ELAN" section later in this chapter for an illustrated example of this scenario.
In a multiple LAN scenario, one ATM switch, one router, and three Catalyst 5000 series switches are used, but multiple ELANs are configured. In the following scenario, three ELANs are configured on a router and three Catalyst 5000 series switches. Refer to the example sections "Configuring Multiple ELANs with Unrestricted Membership" and "Configuring Multiple ELANs with Restricted Membership" for detailed examples.
The LANE components are assigned as follows:
Before you begin configuring LANE, you must decide whether to set up one or multiple ELANs. If you set up Multiple ELANs, decide where the LESs and LECs will be located, and if you will restrict the LECs that can belong to each ELAN.
Once you have made these basic decisions, you can proceed to configure LANE. Some of the tasks required to configure LANE are performed on a Cisco LightStream ATM switch.
The following sections describe the tasks required to configure LANE:
You can configure some ELANs from a router and some from a Catalyst 5000 switch. You can configure some ELANs with unrestricted membership and some ELANs with restricted membership. You can also configure a default ELAN, which must have unrestricted membership.
Once the LANE is configured, you can monitor and maintain the components in the participating Catalyst 5000 ATM modules and optional routers by completing the tasks in the "Monitoring and Maintaining the LANE Components" section.
It might help you to begin if you draw up a plan and a worksheet for your own LANE scenario. Include the following information, and leave space for the ATM address of each LANE component on each subinterface of each participating device. The last three items in this list are very important, they determine how you set up each ELAN in the LECS database:
Before you configure LANE components on Catalyst 5000 switches, you must configure a Cisco LightStream ATM switch with the ATM address prefix to be used by all LANE components in the switch cloud.
To set the ATM address prefix, complete the following steps on the Cisco LightStream ATM switch:
| Task | Command |
|---|---|
| Set the local node ID (prefix of the ATM address). | set local name ip-address mask prefix1 |
| Save the configuration values permanently. | save |
On the Cisco LightStream ATM Switch, you can display the current prefix by using the show network command.
For each Catalyst 5000 series switch that will participate in LANE, set up the necessary LECs for each ELAN; then display and record the LEC ATM addresses. Be sure to keep track of the Catalyst 5000 series switch or router interface where the LECS will eventually be located.
If you are going to have only one default ELAN, you will have only one LES to set up. If you are going to have multiple ELANs, you can set up the LES for another ELAN on a different subinterface on the same interface of this router--or you can place it on a different Catalyst 5000 switch.
To set up only a client on a subinterface, complete the steps in the "Setting Up Signaling and ILMI PVCs" section and the "Setting Up an LEC on a Subinterface" section later in this chapter.
LEC location is important, because any router with LECs for multiple ELANs can route frames between those ELANs.
To set up the LES, BUS, and an LEC on the same subinterface, complete the steps in the following sections:
To set up only an LEC on a subinterface, complete the steps in the following sections:
Once you have set up the components, you can display their ATM addresses by completing the task in the "Displaying the LEC ATM Addresses" section later in this chapter.
Set up the signaling and the ILMI PVC that will communicate with the ILMI on the major ATM interface of any Catalyst 5000 series switch that will participate in LANE. Complete this task only once for a major interface. You do not need to repeat this task on the same interface even though you might configure LECs on several of its subinterfaces.
To set up these PVCs, complete the following steps, beginning in global configuration mode:
| Task | Command |
|---|---|
| Step 1 Specify the major ATM interface and enter interface configuration mode. | interface atm 0 |
| Step 2 Set up the signaling PVC that sets up and tears down SVCs; the vpi and vci values are usually set to 0 and 5, respectively. | atm pvc vcd vpi vci qsaal1 |
| Step 3 Set up a PVC to communicate with the ILMI; the vpi and vci values are usually set to 0 and 16, respectively. | atm pvc vcd vpi vci ilmi |
To set up the LES and (BUS for an ELAN, perform the following steps beginning in interface configuration mode:
| Task | Command |
|---|---|
| Step 1 Specify the subinterface for the first ELAN on this switch. | interface atm 0.subinterface-number |
| Step 2 Enable an LES and a LANE BUS for the first ELAN. | lane server-bus ethernet elan-name |
| Step 3 (Optional) Enable a LEC for the first ELAN. | lane client ethernet [vlan-1] [elan-name] |
| Step 4 Provide a protocol address for the LEC. | protocol address mask(1) |
If the ELAN in Step 3 is intended to have restricted membership, consider carefully whether you want to specify its name here. You will specify the name in the LECS database when it is set up. However, if you link the LEC to an ELAN in this step and, through some mistake, it does not match the database entry linking the LEC to an ELAN, this LEC will not be allowed to join this ELAN or any other. You might consider this as either a helpful check that the configuration is correct, or as a problem to overcome.
If you do decide to include the name of the ELAN linked to the LEC in Step 3 and later want to associate that LEC with a different ELAN, make the change in the LECS database before you make the change for the LEC on this subinterface.
On any given Catalyst 5000 series switch, you can set up one LEC for one ELAN or multiple LECs for multiple ELANs. You can set up a LEC for a given ELAN on any Catalyst 5000 you choose to have participate in that ELAN. After you set up the interface for the VLAN, you must link the VLAN number with the ELAN name.
You must first set up the signaling and ILMI PVCs on the major ATM interface, as described earlier in the "Setting Up Signaling and ILMI PVCs" section, before you set up the LEC.
To set up only a LEC for an ELAN, perform the following steps--beginning in interface configuration mode:
| Task | Command |
|---|---|
| Step 1 Specify the subinterface for a VLAN on this switch. | interface atm 0.subinterface-number |
| Step 2 Enable an LEC for the first ELAN. | lane client ethernet vlan# elan-name |
Once you have set up the LECs as needed on the subinterfaces of an ATM module on the Catalyst 5000 series switch, you can display their ATM addresses by completing the following step in EXEC mode:
| Task | Command |
|---|---|
| Display the LES, BUS, and LEC ATM addresses. | show lane |
The output of this command shows all subinterfaces configured for LANE. For each subinterface, the command displays and clearly labels the ATM addresses that belong to the LES, the BUS, and the LEC.
When you look at each ATM address, you will notice the following:
This automatic assignment of ATM address values was explained in the section "Automatically Assigning ATM Addresses," earlier in this chapter.
Repeat the show lane step on each Catalyst 5000 series switch before you proceed to set up the LECs on the next Catalyst 5000.
Print the display (or make a note on your LANE worksheet of these ATM addresses) so you can use it when you set up the LECS database.
At this point, the LECs will not yet be operational. That is normal for this stage of LANE configuration.
After you have set up all the LESs, BUSs, and LECs on all the ATM subinterfaces on all Catalyst 5000 series switches or routers that will participate in LANE and have displayed their ATM addresses, you can use the information to populate the LECS database.
You can set up a default ELAN, no matter whether you set up any other ELANs. You can also set up some ELANs with restricted membership and others with unrestricted membership.
To set up the database, complete the steps in the following sections as appropriate for your ELAN plan and scenario:
If you have already set up the signaling and ILMI PVCs on this interface, skip to the next section.
You must set up the signaling PVC and the PVC that will communicate with the ILMI on the major ATM interface of any router that will participate in LANE.
Complete this task only once for a major interface. You need not repeat this task on the same interface, even though you might configure LESs and LECs on several of its subinterfaces.
To set up these PVCs, complete the following steps, beginning in global configuration mode:
| Task | Command |
|---|---|
| Step 1 Specify the major ATM interface, and enter interface configuration mode. | interface atm 0 |
| Step 2 Set up the signaling PVC that sets up and tears down SVCs; the vpi and vci values are usually set to 0 and 5, respectively. | atm pvc vcd vpi vci qsaal1 |
| Step 3 Set up a PVC to communicate with the ILMI; the vpi and vci values are usually set to 0 and 16, respectively. | atm pvc vcd vpi vci ilmi1. |
When you configure a Catalyst 5000 switch as the LECSfor one default ELAN, you provide a name for the database, the ATM address of the LES for the ELAN, and a default name for the ELAN. In addition, you indicate that the LECS ATM address is to be computed automatically.
When you set up a database of only a default, unrestricted ELAN, you need not specify where the LANE LECs are located. That is, when you set up the LECS database for a single default ELAN, you need not provide any database entries that link the ATM addresses of any LECs with the ELAN name.
To set up the LECS for the default ELAN, complete the following steps beginning in global configuration mode:
| Task | Commands |
|---|---|
| Step 1 Create a named database for the LANE configuration LECS. | lane database database-name |
| Step 2 In the configuration database, bind the name of the ELAN to the ATM address of the LES. | name elan-name server-atm-address atm-address |
| Step 3 In the configuration database, provide a default name of the ELAN. | default-name elan-name |
| Step 4 Exit from database configuration mode and return to global configuration mode. | exit |
In Step 2, enter the ATM address of the LES for the specified ELAN as noted in your worksheet.
If you are setting up only a default ELAN, the elan-name value in Step 2 is the same as the default ELAN name you provide in Step 3.
When you set up a database for unrestricted ELANs, you create database entries that link the name of each ELAN to the ATM address of its LES.
However, you may choose not to specify where the LECs are located. That is, when you set up the LECS database, you do not have to provide any database entries that link the ATM addresses or MAC addresses of any LECs with the ELAN name.
To configure a router as the LECS for multiple ELANs with unrestricted membership, complete the following steps beginning in global configuration mode:
In Steps 2 and 3, enter the ATM address of the LES for the specified ELAN, as noted in your worksheet.
When you set up the database for restricted-membership ELANs, you create database entries that link the name of each ELAN to the ATM address of its LES.
However, you also must specify where the LECs are located. That is, for each restricted-membership ELAN, you provide a database entry that explicitly links the ATM address or MAC address of each LEC of that ELAN with the name of that ELAN.
Those LEC database entries specify the LECs that are allowed to join the ELAN. When an LEC requests that the LECS indicate which ELAN it is to join, the LECS consults its database and then responds as configured.
When LECs for the same restricted-membership ELAN are located in multiple Catalyst 5000 ATM modules, each LEC ATM address or MAC address must be linked explicitly with the name of the ELAN. As a result, you must configure as many LEC entries (Step 5 in the following procedure) as you have LECs for ELANs in all the ATM modules of Catalyst 5000 switches. Of course, each LEC will have a different ATM address in the database entries.
To set up the LECS for ELANs with restricted membership, perform the following steps, beginning in global configuration mode:
Once you have created the database entries as appropriate to the type and the membership conditions of the ELANs, you can enable the LECS on the selected ATM interface and Catalyst 5000 ATM module and then display its ATM address by completing the following steps:
| Task | Command |
|---|---|
| Step 1 If you are not currently configuring the interface, specify the major ATM interface where the LECS is located. | interface atm 0 |
| Step 2 Link the LECS database name to the specified major interface and enable the LECS. | lane config database-name |
| Step 3 Specify that the LECS ATM address will be computed automatically. | lane auto-config-atm-address |
| Step 4 Exit interface configuration mode. | exit |
| Step 5 Return to EXEC mode | Ctrl-Z |
| Step 6 Display theLECS ATM address. | how lane config |
Make a note of the LECS ATM address so you can configure it on each ATM subinterface where a server and BUS is configured.
You must enter the LECS ATM address into a Cisco LS100 ATM switch and save it permanently, so that the value will not be lost when the switch is reset or powered off.
To enter the LECS ATM address into the Cisco LS100 ATM Switch and save it there permanently, complete the following steps on the Cisco LS100 ATM Switch:
| Task | Command |
|---|---|
| Step 1 Specify the LECS ATM address. | set configserver 0 atm-address |
| Step 2 Save the configuration value permanently. | save |
In Step 1, you must specify the full 40-digit ATM address.
After configuring LANE components on an interface or any of its subinterfaces, on a specified subinterface, or on an ELAN, you can display their status. To show LANE information, perform the following steps in EXEC mode:
This section provides a specific operating example of how to set up a single ATM ELAN (LANE) and configure the LAN Emulation components. Substitute your own values in each step to configure the LANE module in your system. This procedure includes the following tasks:
The example below assumes you have:
Step 1 Obtain a 13-byte ATM address prefix identifier for your ATM switch. This example assumes that the ATM address prefix is:
Step 2 Obtain an IP address for the ATM switch. This is only necessary if you are going to connect the Ethernet interface on the ATM switch to your network.
Step 3 Decide on an emulated LAN (ELAN) name. This example uses the name one.
Step 4 Decide on a LAN emulation LECS database name. This example uses the name test.
Step 5 Determine the slot number of the ATM module in the Catalyst 5000 chassis. This example uses the number 5.
Step 6 Decide on a host name for the ATM switch. This example uses the host name ATMSW.
Step 7 Determine which interface and subinterface will be used for LES and BUS. This example uses subinterface 1.
Configure the default ATM address prefix of all edge devices connected to the switch. If you do not intend to connect the LS 100 ATM switch to the Ethernet network, use 0.0.0.0 as the IP address and 255.255.255.255 as the network mask.
ATMSW>enableInput the password:ATMSW>#set local ATMSWIPaddressmask39000000000000000000000000
After you assign an IP address to the supervisor engine module's sc0 interface, start a session with the ATM module on the console for the Catalyst 5000 as follows. The following example assumes the ATM module is in slot 5.
Step 1 Use the show version command to identify the module number. The example below indicates that module 5 is the ATM module.
show version
Step 2 Start an ATM session and enter enable mode as follows:
session 5
enable
Set up the signaling and ILMI permanent virtual circuits (PVCs) by typing the following commands:
ATM>enATM#config terminalATM(config)#int atm 0ATM(config-if)#atm pvc 1 0 5 qsaalATM(config-if)#atm pvc 2 0 16 ilmiATM(config-if)#end
Display the default ATM network service access points (NSAPs):
ATM#show lane default-atm-addresses
interface ATM1/0:
LANE Client: 39.000000000000000000000000.00000C302A3C.**
LANE Server: 39.000000000000000000000000.00000C302A3D.**
LANE Bus: 39.000000000000000000000000.00000C302A3E.**
LANE Config Server: 39.000000000000000000000000.00000C302A3F.00
note: ** is the subinterface number byte, in hex
To set up the Cisco LS100 ATM switch with the default LECS address, perform these steps:
Step 1 Specify the LECS NSAP address to the Cisco LS100 ATM switch as follows:
#set configserver 0 3900000000000000000000000000000C302A3F00
0 after the configserver command is the index into the LECS address table in the LS100 ATM switch. The switch can accommodate up to four LECS addresses: index 0
through 3.
Step 2 Save the configuration entered on the Cisco LS100 ATM switch to NVRAM. Following is an example:
save
This section describes how to set up the LECS, LES, and BUS.
Step 1 Set up the LECS database using the LES address displayed in the section in this chapter "Displaying the Default LANE Module Network Service Access Points," as follows:
config terminal
ATM(config)#lane database test
ATM(lane-config-database)#name one server-atm-address
39.000000000000000000000000.00000C302A3D.01
ATM(lane-config-database)#default-name one
Consider these important points:
test.
server-atm-address is the one displayed in the command above. For the last byte, use the subinterface number (config-subif) you plan to use in one. (See Step 2 in the next section "Setting Up the LAN Emulation LEC.")
Step 2 Start the LECS as follows:
int atm 0
ATM(config-if)#lane config test
ATM(config-if)#lane auto-config-atm-address
Step 3 Start the LES and BUS as follows:
int atm 0.1
ATM(config-subif)#lane server-bus ethernet one
Step 4 Write the configuration you have entered to NVRAM:
end
ATM#wr mem
Step 1 To set up a LAN Emulation Client (LEC) on an ATM module, use the console of the Catalyst 5000 to start a session with the ATM module:
session 5
Consider these important points:
sc0 interface before running the session command.
Step 2 Start up the LEC as follows:
enable
ATM#config terminal
ATM(config)#int atm 0
ATM(config-if)#no shutdown
ATM(config-if)#atm pvc 1 0 5 qsaal
ATM(config-if)#atm pvc 2 0 16 ilmi
ATM(config-if)#int atm 0.1
ATM(config-subif)#lane client ethernet 1 one
Consider these important points:
one, so you can omit it from the command above. However, you must provide the ELAN name if you are joining an ELAN that has not been designated as the default ELAN. The default was set up in Step 1 in the "Setting Up the Signaling and ILMI Permanent Virtual Circuits" section.
Step 3 The command to bring up a LEC on a Catalyst 5000 is:
lane client ethernet vlan_# elan_name
In this example, all ports on VLAN 1 of the Catalyst 5000 are assigned to the ELAN named one.
Step 4 Write the configuration to NVRAM as follows:
ATM(config-subif)#end
ATM#wr mem
The examples in the following sections illustrate how to configure LANE for the following cases:
All examples use the automatic ATM address assignment method described in the section "Automatically Assigning ATM Addresses" earlier in this chapter.
These examples show the resulting configuration, not the process of determining and entering the ATM addresses appropriately, as described earlier.
The following example configures one Cisco router and three Catalyst 5000 series switches for one ELAN. Router 1 contains the LECS, the LES, the BUS, and a LEC. The remaining Catalyst 5000 series switches each contain a LEC for the ELAN. This example accepts all default settings that are provided. For example, it does not explicitly set ATM addresses for the different LANE components that are co-located on Catalyst 5000 series switch 1. Membership in this LAN is not restricted.
lane database example1 name eng server-atm-address 39.0000014155551211.0800200c1001.01 default-name eng interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi lane auto-config-atm-address lane config example1 interface atm 0.1 lane server-bus ethernet eng lane client ethernet 1
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 0.1 lane client ethernet 1
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 0.1 lane client ethernet 1
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 0.1 lane client ethernet 1
The following example, illustrated in Figure 5-4, configures two Cisco routers and two Catalyst 5000 series switches. It contains three ELANS for engineering, manufacturing, and marketing. This example does not restrict membership in the ELANs.
In this example, Router 1 has the following LANE components:
Router 2 has the following LANE components:
Catalyst 5000 series switch 1 has the following LANE components:
Catalyst 5000 series switch 2 has the following LANE components:
For the purposes of this example, the Catalyst 5000 series switches and routers are assigned the following ATM address prefixes and base ESI:
| Router | ATM Address Prefix | ESI Base |
|---|---|---|
| Router 1 | 39.0000014155551211 | 0800.200c.1000 |
| Catalyst 5000 series switch 1 | 39.0000014155551211 | 0800.200c.20001 |
| Catalyst 5000 series switch 2 | 39.0000 014155551211 | 0800.200c.30001. |
| Router 2 | 39.0000014155551211 | 0800.200c.4000 |
Router 1 has the LECS and its database, the LES and BUS for the manufacturing ELAN, a client for manufacturing, and a client for engineering. Router 1 is configured as follows:
!The following lines name and configure the configuration server's database.
lane database example2
name eng server-atm-address 39.0000014155551211.0800200c2001.02
name man server-atm-address 39.0000014155551211.0800200c1001.01
name mkt server-atm-address 39.0000014155551211.0800200c4001.01
default-name man
!
! The following lines bring up the configuration server and associate
! it with a database name.
interface atm 1/0
atm pvc 1 0 5 qsaal
atm pvc 2 0 16 ilmi
lane auto-config-atm-address
lane config example2
!
! The following 3 lines configure the manufacturing server, broadcast-and-unknown server,
! and the client on atm subinterface 1/0.1. The client is assigned to the default
! emulated lan.
interface atm 1/0.1
ip address 172.16.0.1 255.255.255.0
lane server-bus ethernet man
lane client ethernet
!
! The following 3 lines configure the "eng" client on atm subinterface 1/0.2. The client
! is assigned to the engineering emulated lan. Each emulated LAN is a different ! subnetwork, so the "eng" client has an IP address on a different subnetwork than the
! "man" client.
interface atm 1/0.2
ip address 172.16.1.1 255.255.255.0
lane client ethernet eng
Router 2 has the LES and BUS for the marketing ELAN, an LEC for marketing, and a LEC for manufacturing. Because the default ELAN name is man, the second LEC is linked to that ELAN name by default. Router 2 is configured as follows:
interface atm 3/0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 3/0.1 lane server-bus ethernet mkt lane client ethernet mkt interface atm 3/0.2 lane client ethernet
Catalyst 5000 series switch 1 is configured for the LES and BUS for the engineering ELAN, an LEC of the manufacturing ELAN, and an LEC of the engineering ELAN. Because the default ELAN name is man, the first LEC is linked to that ELAN name by default.
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 0.1 lane client ethernet 1 interface atm 0.2 lane server-bus ethernet eng lane client ethernet 2 eng
Catalyst 5000 series switch 2 is configured for an LEC of the manufacturing ELAN and a LEC of the marketing ELAN. Because the default ELAN name is man, the first LEC is linked to that ELAN name by default.
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 0.1 lane client ethernet 1 interface atm 0.2 lane client ethernet 3 mkt
Figure 5-5, illustrates the configuration of the Cisco router for three ELANS for engineering, manufacturing, and marketing.
The same components are assigned to the four routers as in the previous example. The ATM address prefixes and MAC addresses are also the same as in the previous example.
However, this example restricts membership in the ELANs. In this example, the LECS database has explicit entries binding the ATM addresses of LECs to specified, named ELANs. In such cases, the LEC asks the LECS which ELAN it belongs to; the LECS checks its database and informs the LEC to which ELAN it belongs.
Router 1 has the LECS and its database, the LES and BUS for the manufacturing ELAN, a LEC for manufacturing, and a LEC for engineering. It also has explicit database entries binding the ATM addresses of LECs to specified, named ELANs. Router 1 is configured as follows:
! The following lines name and configure the configuration server's database. lane database example3 name eng server-atm-address 39.0000014155551211.0800200c2001.02 restricted name man server-atm-address 39.0000014155551211.0800200c1001.01 name mkt server-atm-address 39.0000014155551211.0800200c4001.01 restricted default-name man ! ! The following lines add database entries binding specified client ATM ! addresses to emulated LANs. In each case, the Selector byte corresponds ! to the subinterface number on the specified router. ! The next command binds the client on Router 1's subinterface 2 to the eng ELAN. client-atm-address 39.0000014155551211.0800200c1000.02 name eng ! The next command binds the client on Router 2's subinterface 2 to the eng ELAN. client-atm-address 39.0000014155551211.0800200c2000.02 name eng ! The next command binds the client on Router 3's subinterface 2 to the mkt ELAN. client-atm-address 39.0000014155551211.0800200c3000.02 name mkt ! The next command binds the client on Router 4's subinterface 1 to the mkt ELAN. client-atm-address 39.0000014155551211.0800200c4000.01 name mkt ! ! The following two lines bring up the configuration server and associate ! it with a database name. interface atm 1/0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi lane auto-config-atm-address lane config example3 ! ! The following 3 lines configure the "man" server/broadcast-and-unknown server, ! and the client on atm subinterface 1/0.1. The client is assigned to the default ! emulated lan. interface atm 1/0.1 ip address 172.16.0.1 255.255.255.0 lane server-bus ethernet man lane client ethernet ! ! The following 3 lines configure the "eng" client on atm subinterface 1/0.2. The ! configuration server assigns the client to the engineering emulated lan. interface atm 1/0.2 ip address 172.16.1.1 255.255.255.0 lane client ethernet eng
Router 2 has the LES and BUS for the marketing ELAN, a client for marketing, and a LEC for manufacturing. The first LEC is listed in the database as linked to the mkt ELANs. The second LEC is not listed in the database, but is linked to the man ELAN name by default. Router 2 is configured as follows:
interface atm 3/0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi ! The first client is explicitly entered in the configuration server's ! database as linked to the "mkt" ELAN. interface atm 3/0.1 ip address 172.16.2.4 255.255.255.0 lane server-bus ethernet mkt lane client ethernet mkt ! The following client is not entered in the database, so it is linked to the ! "man" ELAN by default. interface atm 3/0.2 ip address 172.16.0.4 255.255.255.0 lane client ethernet
Catalyst 5000 series switch 1 is configured for the LES and BUS for the engineering ELAN, a LEC of the manufacturing ELAN, and a LEC of the engineering ELAN. Because the default ELAN name is man, the first LEC is linked to that ELAN name by default.
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi interface atm 0.1 lane client ethernet 1 ! A client for the following interface is entered in the configuration ! server's database as linked to the "eng" ELAN. interface atm 0.2 lane server-bus ethernet eng lane client ethernet 2 eng
Catalyst 5000 series switch 2 is configured for a LEC of the manufacturing ELAN and a LEC of the marketing ELAN. Because the default ELAN name is man, the first LEC is linked to that ELAN name by default. The second LEC is listed in the database as linked to the mkt ELAN.
interface atm 0 atm pvc 1 0 5 qsaal atm pvc 2 0 16 ilmi ! The first client is not entered in the database, so it is linked to the ! "man" ELAN by default. interface atm 0.1 lane client ethernet 1 ! The second client is explicitly entered in the configuration server's ! database as linked to the "mkt" ELAN. interface atm 0.2 lane client ethernet 3 mkt
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