Planning A Switch Cluster; Automatic Discovery Of Cluster Candidates And Members; Discovery Through Cdp Hops; Tac - Cisco WS-C2955T-12 Software Manual

Chapter 5 Clustering Switches

Planning a Switch Cluster

Anticipating conflicts and compatibility issues is a high priority when you manage several switches
through a cluster. This section describes these guidelines, requirements, and caveats that you should
understand before you create the cluster:
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Refer to the release notes (http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/index.htm) for
the list of Catalyst switches eligible for switch clustering, including which ones can be command
switches and which ones can only be member switches, and for the required software versions and
browser and Java plug-in configurations.

Automatic Discovery of Cluster Candidates and Members

The command switch uses Cisco Discovery Protocol (CDP) to discover member switches, candidate
switches, neighboring switch clusters, and edge devices in star or cascaded topologies.
Note Do not disable CDP on the command switch, on cluster members, or on any cluster-capable switches
that you might want a command switch to discover. For more information about CDP, see the
"Configuring CDP" section on page
Following these connectivity guidelines ensures automatic discovery of the switch cluster, cluster
candidates, connected switch clusters, and neighboring edge devices:
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78-6511-08
Automatic Discovery of Cluster Candidates and Members, page 5-5
HSRP and Standby Command Switches, page 5-12
IP Addresses, page 5-15
Host Names, page 5-16
Passwords, page 5-16
SNMP Community Strings, page 5-16
TACACS+ and RADIUS, page 5-17
Access Modes in CMS, page 5-17
Management VLAN, page 5-18
Network Port, page 5-19
NAT Commands, page 5-19
LRE Profiles, page 5-19
Availability of Switch-Specific Features in Switch Clusters, page 5-19
Discovery through CDP Hops, page 5-6
Discovery through Non-CDP-Capable and Noncluster-Capable Devices, page 5-7
Discovery through the Same Management VLAN, page 5-8
Discovery through Different Management VLANs, page 5-9
Discovery of Newly Installed Switches, page 5-11
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
6-13.
Planning a Switch Cluster
5-5