Cisco Systems DOC-7814982 - page 140

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Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 6 Clustering Switches
Planning a Sw it ch Cl uster
•All stan dby-group memb ers must be me mber s of the clust er.
Note There is no limit to the number of switches that you can assign as standby command
switches. However, the total number of switches in the cluster—which would include the
active command switc h, standby-gr oup mem bers, and memb er swit ches—ca nnot be more
than 16.
•Each standby-group member (see Figure 6-9) must be conne cted to the command switch through its
management VLAN. Each standby-group member must also be redundantly connected to each other
through the management VLAN.
Catalyst 1900, Catalyst 2820, Ca talyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL member
switches m ust be conn ec ted t o the c lust er sta ndby g roup t hrou gh the ir m anag emen t V LANs .
Note Catalyst 2950 standby com mand sw itch es run ning Re leas e 12 .1 (9)EA 1 or la ter can conn ec t to
candidate and member switches in VLANs different from their management VLANs.
For more information about VLANs in switch clusters, see these sections:
– “Discovery through the Same Mana gement VL AN” section on pa ge 6-8
– “Discovery thro ugh Different Manage ment VL ANs” se ction on page 6-9
Figure 6-9 VLAN Connectivity between Standby-Group Members and Cluster Members
Si
Management
VLAN 16
Catalyst 2900 XL or
Catalyst 3500 XL
switch
Catalyst 3550
multilayer switch
Catalyst 3550 standby
command switch
VLAN 16
VLAN 9
Si Si
VLAN 9
Catalyst 3550 active
command switch Catalyst 3550 passive command switch
Member switches
Management
VLAN 9
Catalyst 3550
switch
Catalyst 2950
switch
VLAN 9
VLANs 9,16 VLANs 9,16
Management
VLAN 16
65280
Si