Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 588)

558 Multi-Service IronWare Switching Configuration Guide
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Layer 2 redundancy
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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’s 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’s 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 162 shows an example.
FIGURE 162 Track port priority
In Figure 162 , the track port is up. SInce the port is up, the track priority does not affect the VSRP
priority calculation. If the track port goes down, the track priority does affect VSRP priority
calculation, as shown in
Figure 163 .
FIGURE 163 Track port priority subtracted during priority calculation