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BLADE OS 5.1 Application Guide
80
Chapter 5: Spanning Tree Group BMD00136, November 2009
Spanning Tree with ISLs
This configuration shows how to configure Spanning Tree Protocol with Inter-Switch Links (ISLs).
In normal operation, the ISL is blocked by Spanning Tree. If there is an uplink failure on one
switch, the ISL becomes active, and traffic passes through the ISL to the active uplink.
Figure 11 Spanning Tree with Inter-Switch Links
In the example illustrated in Figure 11, assume that port 50 on each switch is used for the ISL. To
ensure that the ISL is blocked during normal operation, set the port path cost to a higher value than
other paths in the network.
Configure the port path cost on the ISL port for both switches.
Server 1
Server 2
Server 3
Server 4
Enterprise
Routing Switch
Enterprise
Routing Switch
Switch 1 Switch 2
x
RS G8000 (config)# interface port 50
RS G8000 (config-if)# spanning-tree stp 1 path-cost 60000