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LAN Emulation (LANE)

FSSRP Sample Configuration

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Document ID: 10443

Updated: Dec 14, 2007

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Introduction

To improve the ATM LAN Emulation (LANE) Simple Server Replication Protocol (SSRP), Cisco has introduced the ATM LANE Fast Simple Server Replication Protocol (FSSRP). FSSRP differs from LANE SSRP in that all configured LANE servers of an Emulated LAN (ELAN) are always active. FSSRP-enabled LANE clients have virtual circuits (VCs) established to a maximum of four LANE servers and broadcast and unknown servers (BUSes) at one time. If a single LANE server (LES) goes down, the LANE client quickly switches over to the next LES and BUS, resulting in no data or LANE Address Resolution Protocol (LE_ARP) table entry loss and no extraneous signaling. Refer to the documentation for more details.

Note: The locations of the various services shown in this document might not be optimal. Before implementing such a configuration in a live network, review the LANE Design Recommendations.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

All hardware components (LAN Emulation Client [LEC], LES, BUS, LANE Configuration Server [LECS]) can be FSSRP capabable. If none of the FSSRP-enabled components are used, you cannot benefit from the features of FSSRP.

Below are the supported software versions for FSSRP:

  • Cisco IOS® Software Release 12.0(5)T and later

  • Catalyst LANE Module version 12.0 and later

  • Cisco LightStream1010 version 12.0(4a)W5(11a) and later

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to Cisco Technical Tips Conventions.

Configure

In this section, you are presented with the information to configure the features described in this document.

Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .

Network Diagram

This document uses this network setup:

fssrpconfig1.gif

Configurations

You must configure lane fssrp in the interface configuration of the ATM port (the port to perform FSSRP).

Catalyst 5500 LANE Module (LEC Only)

Below is the current configuration:

5500 
!
      hostname ATM
      !
      interface Ethernet0
      !      interface ATM0
       atm preferred phy A
       atm pvc 1 0 5 qsaal
       atm pvc 2 0 16 ilmi
       no atm ilmi-keepalive
       lane fssrp
      !
      interface ATM0.1 multipoint
       lane client ethernet 1 admin
      !
      end

7200 (Master LES/BUS + LEC)

Below is the current configuration:

7200 
version 12.1
     !
     interface ATM4/0
      no ip address
      no ip route-cache cef
      atm pvc 1 0 5 qsaal
      atm pvc 2 0 16 ilmi
      no atm ilmi-keepalive
      lane fssrp
     !
     interface ATM4/0.2 multipoint
      lane server-bus ethernet admin elan-id 1
     !
     interface ATM4/0.3 multipoint
      lane client ethernet admin
     !
     end

LS1010 (LECS, LEC and Backup LES/BUS)

Below is the current configuration:

LS1010 
version 12.0
    !
    hostname Casimir
    !
    !
    atm lecs-address-default
    47.0091.8100.0000.0060.3e5a.4501.0060.3e5a.4505.00 1
    atm address 47.0091.8100.0000.0060.3e5a.4501.0060.3e5a.4501.00
    atm router pnni
     no aesa embedded-number left-justified
     node 1 level 56 lowest
      redistribute atm-static
    !
    !
    lane database FSSRPConfig
      name admin server-atm-address 47.00918100000000603E5A4501.0030199AB871.02
      name admin server-atm-address 47.00918100000000603E5A4501.00603E5A4503.02
      name admin elan-id 1
    !
    !
    interface ATM2/0/0
     no ip address
     no ip directed-broadcast
     atm maxvp-number 0
     lane config auto-config-atm-address
     lane config database FSSRPConfig
     lane fssrp
    !
    interface ATM2/0/0.1 multipoint
     no ip directed-broadcast
     lane client ethernet admin
    !
    interface ATM2/0/0.2 multipoint
     no ip directed-broadcast
     lane server-bus ethernet admin elan-id 1
    !
     end

Verify

This section provides information you can use to confirm your configuration is working properly.

LAN Emulation Client

You can verify that the LEC is running FSSRP and find out more about the LES/BUS pairs providing services for the ELAN by issuing the show lane client detail command.

As shown below, all the LECs have joined both the active and the backup LES. Therefore, in case of a failure of the active LES, no new connection needs to be set up.

ATM# show lane client detail
      LE Client ATM0.1  ELAN name: admin  Admin: up  State: operational
      Client ID: 2                 LEC up for 33 minutes 20 seconds
      ELAN ID: 1      Join Attempt: 16
      This LEC is running in Fast SSRP mode
      Known LE Servers: 2 <-- LEC aware of both LESes
      Last Fail Reason: Link went down
      HW Address: 00e0.1410.d830   Type: ethernet         Max Frame Size: 1516 ANID: 1
      ATM Address: 47.00918100000000603E5A4501.00E01410D830.01
       VCD  rxFrames  txFrames  Type       ATM Address
         0         0         0  configure  47.00918100000000603E5A4501.00603E5A4505
                                           LEC ID: 2, State: LESBUS_ACTIVE
        44         1      1003  direct     47.00918100000000603E5A4501.00603E5A4503.02
        46      1035         0  distribute 47.00918100000000603E5A4501.00603E5A4503.02
        48         0      1057  send       47.00918100000000603E5A4501.00603E5A4504.02
        50        99         0  forward    47.00918100000000603E5A4501.00603E5A4504.02
                        LEC ID: 3, State: LESBUS_ACTIVE  <-- LEC joined the Backup LES
        45         1         2  direct     47.00918100000000603E5A4501.0030199AB871.02
        47        34         0  distribute 47.00918100000000603E5A4501.0030199AB871.02
        49         0         0  send       47.00918100000000603E5A4501.0030199AB872.02
        51         0         0  forward    47.00918100000000603E5A4501.0030199AB872.02
      Ischia# show lane client detail
      LE Client ATM4/0.3  ELAN name: admin  Admin: up  State: operational
      Client ID: 3
      LEC up for 34 minutes 13 seconds
      ELAN ID: 1
      Join Attempt: 7
      This LEC is running in Fast SSRP mode
     Known LE Servers: 2 <-- LEC aware of both LESes
      Last Fail Reason: Locally deactivate
      HW Address: 0030.199a.b870   Type: ethernet             Max Frame Size: 1516
      ATM Address: 47.00918100000000603E5A4501.0030199AB870.03
       VCD  rxFrames  txFrames  Type       ATM Address
         0         0         0  configure  47.00918100000000603E5A4501.00603E5A4505.00
                                           LEC ID: 3, State: LESBUS_ACTIVE
        66         1         2  direct     47.00918100000000603E5A4501.00603E5A4503.02
        67      1059         0  distribute 47.00918100000000603E5A4501.00603E5A4503.02
        68         0        74  send       47.00918100000000603E5A4501.00603E5A4504.02
        69      1186         0  forward    47.00918100000000603E5A4501.00603E5A4504.02
                         LEC ID: 2, State: LESBUS_ACTIVE <-- LEC joined the Backup LES
        70         1         2  direct     47.00918100000000603E5A4501.0030199AB871.02
        74        36         0  distribute 47.00918100000000603E5A4501.0030199AB871.02
        76         0         0  send       47.00918100000000603E5A4501.0030199AB872.02
        79         0         0  forward    47.00918100000000603E5A4501.0030199AB872.02
      Casimir# show lane client detail
      LE Client ATM2/0/0.1  ELAN name: admin  Admin: up  State: operational
      Client ID: 1                 LEC up for 36 minutes 16 seconds
      ELAN ID: 1      Join Attempt: 2
      This LEC is running in Fast SSRP mode
      Known LE Servers: 2 <-- LEC aware of both LESes
      Last Fail Reason: Local config change
      HW Address: 0060.3e5a.4502   Type: ethernet             Max Frame Size: 1516
      ATM Address: 47.00918100000000603E5A4501.00603E5A4502.01
       VCD  rxFrames  txFrames  Type       ATM Address
         0         0         0  configure  47.00918100000000603E5A4501.00603E5A4505.00
                                           LEC ID: 1, State: LESBUS_ACTIVE
       143         1         2  direct     47.00918100000000603E5A4501.00603E5A4503.02
       146      1120         0  distribute 47.00918100000000603E5A4501.00603E5A4503.02
       147         0        38  send       47.00918100000000603E5A4501.00603E5A4504.02
       150      1228         0  forward    47.00918100000000603E5A4501.00603E5A4504.02
                         LEC ID: 1, State: LESBUS_ACTIVE <-- LEC joined the Backup LES
      177         1         2  direct     47.00918100000000603E5A4501.0030199AB871.02
      178        37         0  distribute 47.00918100000000603E5A4501.0030199AB871.02
      179         0         0  send       47.00918100000000603E5A4501.0030199AB872.02
      180         0         0  forward    47.00918100000000603E5A4501.0030199AB872.02

LAN Emulation Server

You can issue the show lane server command to verify the status of the LES. As shown below, the LES on the 7200 platform is running in backup mode, and the LES on the LS1010 is active. Both the active and the backup have a connection to all three clients.

Ischia# show lane server
 LE Server ATM4/0.2, Elan name: admin, Admin: up, State: operational
 This LES is running in Fast SSRP mode
 Master/Backup: Backup, Type: ethernet, Max Frame Size: 1516
 locally set elan-id: 1
 elan-id obtained from LECS: 1
 ATM address: 47.00918100000000603E5A4501.0030199AB871.02
 LECS used: 47.00918100000000603E5A4501.00603E5A4505.00 connected, vcd 65, fssrp
 control distribute: vcd 73, 3 members, 38 packets <-- LEC joined the LES while in Backup state
 proxy/ (ST: Init, Conn, Waiting, Adding, Joined, Operational, Reject, Term)
 lecid ST vcd    pkts Hardware Addr  ATM Address
    1P O   71       2 0060.3e5a.4502 47.00918100000000603E5A4501.00603E5A4502.01
    2P O   72       2 0030.199a.b870 47.00918100000000603E5A4501.0030199AB870.03
    3P O   80       2 00e0.1410.d830 47.00918100000000603E5A4501.00E01410D830.01

LAN Emulation Configuration Server

The LECS status can be displayed by issuing the show lane config command. As shown below, the LECS is tracking both the LES and the backup LES/BUS, with LES as the active one.

Casimir# show lane config
 Config table: FSSRPConfig
 Admin: up State: operational
 This LECS is running in Fast SSRP mode
 LECS Mastership State: active master
 list of global LECS addresses (23 seconds to update):
 47.00918100000000603E5A4501.00603E5A4505.00  &alt------- me
 ATM Address of this LECS: 47.00918100000000603E5A4501.00603E5A4505.00 (auto)
 vcd  rxCnt  txCnt  callingParty
 138      1     47  47.00918100000000603E5A4501.00603E5A4503.02 LES admin 1 active, fssrp
 174      1     46  47.00918100000000603E5A4501.0030199AB871.02 LES admin 0 backup, fssrp
 cumulative total number of unrecognized packets received so far: 0
 cumulative total number of config requests received so far: 26
 cumulative total number of config failures so far: 3
     cause of last failure: no configuration
     culprit for the last failure: 47.00918100000000603E5A4501.0030199AB870.03
 With the command show lane config you can verify the Database indeed is being bound
 to the LECS.
 Casimir# show lane database FSSRPConfig
  LANE Config Server database table 'FSSRPConfig' bound to interface/s: ATM2/0/0
 no default elan
 elan 'admin': un-restricted, elan-id 1
   server 47.00918100000000603E5A4501.0030199AB871.02 (prio 0)
   server 47.00918100000000603E5A4501.00603E5A4503.02 (prio 1)

Conclusion

With FSSRP enabled on all the components in the LAN cloud, the LEC can join the backup LES/BUS. This reduces switchover times in case of a failure on the primary LES/BUS.

show and debug Commands

Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.

Related Information

Updated: Dec 14, 2007
Document ID: 10443