Hsrp And Standby Command Switches - Cisco Catalyst 3550 series Software Configuration Manual

Planning a Switch Cluster
Figure 6-8
Catalyst 2950
(Management
New (out-of-box)
Catalyst 3550

HSRP and Standby Command Switches

The switch supports Hot Standby Router Protocol (HSRP) so that you can configure a group of standby
command switches. Because a command switch manages the forwarding of all communication and
configuration information to all the member switches, we strongly recommend that you configure a
cluster standby command switch to take over if the primary command switch fails.
A cluster standby group is a group of command-capable switches that meet the requirements described
in the
can be assigned per cluster. Follow these guidelines when configuring a cluster standby group:
•
•
•
•
•
•
Note The cluster standby group is an HSRP group. Disabling HSRP disables the cluster standby group.
Catalyst 3550 Multilayer Switch Software Configuration Guide
6-12
Discovery of Newly Installed Switches
Command switch
Si
VLAN 9
switch
AP
VLAN 9)
VLAN 9
Si
switch
"Standby Command Switch Characteristics" section on page
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 2955 switch, all standby command switches must be
Catalyst 2955 switches.
When the command switch is a Catalyst 2950 LRE switch, all standby command switches must be
Catalyst 2950 LRE switches.
When the command switch is a non-LRE Catalyst 2950 switch running Cisco IOS
Release 12.1(9)EA1 or later, all standby command switches must be non-LRE Catalyst 2950
switches running Cisco IOS Release 12.1(9)EA1 or later.
When the command switch is a non-LRE Catalyst 2950 switch running Cisco IOS
Release 12.1(6)EA2 or later, all standby command switches must be non-LRE Catalyst 2950
switches running Cisco IOS Release 12.1(6)EA2 or later.
When the command switch is running Cisco IOS Release 12.0(5)WC2 or earlier, the standby
command switches can be these switches: Catalyst 2900 XL, non-LRE Catalyst 2950, and
Catalyst 3500 XL switches.
VLAN 16
Catalyst 3500 XL
switch
(Management
AP
VLAN 16)
VLAN 16
New (out-of-box)
Catalyst 2950
switch
Chapter 6 Clustering Switches
6-3. Only one cluster standby group
78-11194-09