Cisco Systems 3750E 用户手册
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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 6 Clustering Switches
Planning a Switch Cluster
•
All standby-group members must be members of the cluster.
Note
There is no limit to the number of switches that you can assign as standby cluster command
switches. However, the total number of switches in the cluster—which would include the
active cluster command switch, standby-group members, and cluster member
switches—cannot be more than 16.
switches. However, the total number of switches in the cluster—which would include the
active cluster command switch, standby-group members, and cluster member
switches—cannot be more than 16.
•
Each standby-group member (
) must be connected to the cluster command switch through
the same VLAN. In this example, the cluster command switch and standby cluster command
switches are Catalyst 3560-E or Catalyst 3750-E cluster command switches. Each standby-group
member must also be redundantly connected to each other through at least one VLAN in common
with the switch cluster.
switches are Catalyst 3560-E or Catalyst 3750-E cluster command switches. Each standby-group
member must also be redundantly connected to each other through at least one VLAN in common
with the switch cluster.
Catalyst 1900, Catalyst 2820, Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL cluster
member switches must be connected to the cluster standby group through their management
VLANs. For more information about VLANs in switch clusters, see these sections:
member switches must be connected to the cluster standby group through their management
VLANs. For more information about VLANs in switch clusters, see these sections:
–
–
Figure 6-7
VLAN Connectivity between Standby-Group Members and Cluster Members
Automatic Recovery of Cluster Configuration
The active cluster command switch continually forwards cluster-configuration information (but not
device-configuration information) to the standby cluster command switch. This ensures that the standby
cluster command switch can take over the cluster immediately after the active cluster command switch
fails.
device-configuration information) to the standby cluster command switch. This ensures that the standby
cluster command switch can take over the cluster immediately after the active cluster command switch
fails.
101326
Management
VLAN 16
VLAN 16
Standby
command device
VLAN 16
VLAN 9
VLAN 9
Command
device
Passive
command device
Member devices
Management
VLAN 9
VLANs 9,16
VLANs 9,16
Management
VLAN 16