Chapter 5 Clustering Switches
Planning a Switch Cluster
5-10
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Host Names
You do not need to assign a host name to either a command switch or an eligible
cluster member. However, a host name assigned to the command switch can help
to more easily identify the switch cluster. The default host name for any
Catalyst 2900 XL and Catalyst 3500 XL switch is Switch.
If a switch joins a cluster and it does not have a host name, the command switch
appends a unique member number to its own host name and assigns it sequentially
as each switch joins the cluster. The number indicates the member number of the
switch. For example, a command switch named eng-cluster could name cluster
member number 5, eng-cluster-5.
If a switch has a host name, it retains that name when it joins a cluster. It retains
that host name even after it leaves the cluster.
If a switch received its host name from the command switch, was removed from
the cluster, and was then was added to a new cluster, its old host name (such as
eng-cluster-5) is overwritten with the host name of the command switch in the
new cluster.
SNMP Community Strings
The Cluster Management software appends the member switch number (@esN,
where N is the switch number) to the first configured RO and RW community
strings on the command switch and propagates them to the member switch:
• commander-readonly-community-string@esN
• commander-readwrite-community-string@esN
If the command switch has multiple read-only or read-write community strings,
only the first read-only and read-write strings are propagated to the member
switch.
The Catalyst 2900 XL and Catalyst 3500 XL switches support an unlimited
number of community strings and string lengths.
The Catalyst 1900 and Catalyst 2820 switches support up to four read-only and
four read-write community strings; each string contains up to 32 characters. When
these switches join the cluster, the first read-only and read-write community
string on the command switch is propagated and overwrites the fourth read-only
and read-write community string on the member switches. To support the
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