Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

Converting a fabric cluster to a logical chassis cluster

You can convert an existing fabric cluster to a logical chassis cluster using the default configuration file.

  1. Be sure all nodes are running the same firmware version. Logical chassis cluster functionality is supported in Network OS 4.0.0 and later.
  2. Be sure all the nodes that you intend to transition from a fabric cluster to a logical chassis cluster are online. Run either the show vcs or show vcs detail command to check the status of the nodes.
  3. Log in to one switch that you are converting from fabric cluster mode to logical chassis cluster mode.
  4. In Privileged EXEC mode, enter the vcs logical-chassis enable command with desired options; for example you can convert all RBridges with one command:
    switch# vcs logical-chassis enable rbridge-id all default-config
    To convert a specific RBridge from fabric cluster mode to logical chassis mode, use the RBridge ID value in place of the "all" option. You can also specify a range, such as "1,3,4-6". Refer to the Network OS Command Reference for details.

    The nodes automatically reboot in logical chassis cluster mode. Allow for some down time during the mode transition.

  5. Run either the show vcs or the show vcs detail command to check that all nodes are online and now in logical chassis cluster (listed as "Distributed" in the command output) mode.
  6. The show vcs command output can also be used to determine which node has been assigned as the cluster principal node.
    switch# show vcs
    R-Bridge   WWN                     Switch-MAC            Status
    1     > 11:22:33:44:55:66:77:81    AA:BB:CC::DD:EE:F1    Online
    2       11:22:33:44:55:66:77:82    AA:BB:CC::DD:EE:F2    Online
    3       11:22:33:44:55:66:77:83*	  AA:BB:CC::DD:EE:F3    Online

    The RBridge ID with the arrow pointing to the WWN is the cluster principal. In this example, RBridge ID 1 is the principal.

  7. Log in to the principal cluster and make any desired global and local configuration changes. These changes then are distributed automatically to all nodes in the logical chassis cluster.
    You can enter the RBridge ID configuration mode for any RBridge in the cluster from the cluster principal node.
    You can change the principal node by using the logical-chassis principal priority and logical chassis principal switchover commands. For more information about cluster principal nodes, refer to Selecting a principal node.