Cisco WS-C2960S-24PD-L Software Guide - Page 113
Virtual IP Addresses, Other Considerations for Cluster Standby Groups
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Chapter 5 Clustering Switches Planning a Switch Cluster Virtual IP Addresses You need to assign a unique virtual IP address and group number and name to the cluster standby group. This information must be configured on the management VLAN on the active command switch. The active command switch receives traffic destined for the virtual IP address. To manage the cluster, you must access the active command switch through the virtual IP address, not through the command-switch IP address. This is in case the IP address of the active command switch is different from the virtual IP address of the cluster standby group. If the active command switch fails, the standby command switch assumes ownership of the virtual IP address and becomes the active command switch. The passive switches in the cluster standby group compare their assigned priorities to determine the new standby command switch. The passive standby switch with the highest priority then becomes the standby command switch. When the previously active command switch becomes active again, it resumes its role as the active command switch, and the current active command switch becomes the standby command switch again. For more information about IP address in switch clusters, see the "IP Addresses" section on page 5-15. Other Considerations for Cluster Standby Groups These requirements also apply: • Standby command switches must meet these requirements: - When the command switch is a Catalyst 3550 switch, all standby command switches must be Catalyst 3550 switches. - When the command switch is a Catalyst 2950 switch running Release 12.1(9)EA1 or later, all standby command switches must be Catalyst 2950 switches running Release 12.1(9)EA1 or later. - When the command switch is a Catalyst 2950 switch running Release 12.1(6)EA2 or later, all standby command switches must be Catalyst 2950 switches running Release 12.1(6)EA2 or later. - When the command switch is running Release 12.0(5)WC2 or earlier, the standby command switches can be these switches: Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL switches. We strongly recommend that the command switch and standby command switches are of the same switch platform. - If you have a Catalyst 3550 command switch, the standby command switches should be Catalyst 3550 switches. - If you have a Catalyst 2950 command switch, the standby command switches should be Catalyst 2950 switches. - If you have a Catalyst 2900 XL or Catalyst 3500 XL command switch, the standby command switches should be Catalyst 2900 XL and Catalyst 3500 XL switches. • Only one cluster standby group can be assigned to a cluster. 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 5-13