Network OS Administration Guide

Supporting Network OS 6.0.1a

Part Number: 53-1003768-04

Creating a logical chassis cluster

This section covers the basic steps to create a logical chassis cluster, with the assumption that all physical connectivity requirements have been met. The following figure is a representation of a five-node logical chassis cluster.

Figure 13. Five-node logical chassis cluster

To create a logical chassis cluster, follow the steps in the following example:

  1. Log in to one switch that will be a member of the logical chassis cluster you are creating:
  2. In privileged EXEC mode, enter the vcs command with options to set the VCD ID, the RBridge ID and enable logical chassis mode for the switch. The VCS ID and RBridge IDs shown are chosen for the purposes of this example.
    switch# vcs vcsid 22 rbridge-id 15 logical-chassis enable 
  3. The switch reboots after you run the vcs command. You are asked if you want to apply the default configuration; answer yes.
  4. Repeat the previous steps for each node in the cluster, changing only the RBridge ID each time. You must, however, set the VCS ID to the same value on each node that belongs to the cluster.
  5. When you have enabled the logical chassis mode on each node in the cluster, run the show vcs command to determine which node has been assigned as the cluster principal node. The arrow (>) denotes the principal node. The asterisk (*) denotes the current logged-in node.
    switch# show vcs
    Config Mode    : Distributed                                    
    VCS Mode       : Logical Chassis                                
    VCS ID         : 44                                             
    VCS GUID       : bcab366e-6431-42fe-9af1-c69eb67eaa28           
    Total Number of Nodes           : 3                             
    Rbridge-Id       WWN                            Management IP   VCS Status       Fabric Status        HostName
    144              10:00:00:27:F8:1E:3C:8C   Offline          Unknown              sw0     
    152             >10:00:00:05:33:E5:D1:93*   Online           Online               cz41-h06-m-r2
    158              10:00:00:27:F8:F9:63:41   Offline          Unknown              sw0          

    The RBridge ID with the arrow pointing to the WWN is the cluster principal. In this example, RBridge ID 154 is the principal.

  6. Set the clock and time zone for the principal node. Time should be consistent across all the nodes. Refer to Using Network Time Protocol.
  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 for the cluster.