Brocade TurboIron 24X Series Configuration Guide - Manual (Page 337)

Brocade TurboIron 24X Series Configuration Guide 303
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Virtual Switch Redundancy Protocol (VSRP)
FIGURE 21 VSRP priority bias
Track ports
Optionally, you can configure track ports to be included during VSRP priority calculation. In VSRP, a
track port is a port that is not a member of the VRID VLAN, but whose state is nonetheless
considered when the priority is calculated. Typically, a track port represents the exit side of traffic
received on the VRID ports. By default, no track ports are configured.
When you configure a track port, you assign a priority value to the port. If the port goes down, VSRP
subtracts the track port priority value from the configured VSRP priority. For example, if the you
configure a track port with priority 20 and the configured VSRP priority is 100, the software
subtracts 20 from 100 if the track port goes down, resulting in a VSRP priority of 80. The new
priority value is used when calculating the VSRP priority.
Figure 22 shows an example.
X
VSRP
Master
VSRP
Backup
optional link
VSRP
Aware
VSRP
Aware
VSRP
Aware
F F F
B B B
Configured priority = 150
Actual priority = 150 * (2/3) = 100 Configured priority = 100
Actual priority = (100 - 0) * (3/3) = 100
Link down