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Configuring Switch Clusters
How to Plan for Switch Clustering
LRE Profiles, page 100
Refer to the release notes for the list of Catalyst switches eligible for switch clustering, including which ones can be
cluster command switches and which ones can only be cluster member switches, and for the required software versions
and browser and Java plug-in configurations.
Automatic Discovery of Cluster Candidates and Members
The cluster command switch uses Cisco Discovery Protocol (CDP) to discover cluster member switches, candidate
switches, neighboring switch clusters, and edge devices across multiple VLANs and in star or cascaded topologies.
Note:
Do not disable CDP on the cluster command switch, on cluster members, or on any cluster-capable switches that
you might want a cluster command switch to discover. For more information about CDP, see
Following these connectivity guidelines ensures automatic discovery of the switch cluster, cluster candidates, connected
switch clusters, and neighboring edge devices:
Discovery Through CDP Hops, page 94
Discovery Through Non-CDP-Capable and Noncluster-Capable Devices, page 95
Discovery Through Different VLANs, page 96
Discovery Through Different Management VLANs, page 97
Discovery Through Routed Ports, page 97
Discovery of Newly Installed Switches, page 98
Discovery Through CDP Hops
By using CDP, a cluster command switch can discover switches up to seven CDP hops away (the default is three hops)
from the edge of the cluster. The edge of the cluster is where the last cluster member switches are connected to the
cluster and to candidate switches. For example, cluster member switches 9 and 10 in
edge of the cluster.
In
Figure 7 on page
The cluster command switch discovers switches 11, 12, 13, and 14 because they are within three hops from the edge
of the cluster. It does not discover switch 15 because it is four hops from the edge of the cluster.
95, the cluster command switch has ports assigned to VLANs 16 and 62. The CDP hop count is three.
94
Configuring CDP, page 499
Figure 7 on page 95
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