Foundry Networks FESX User Manual

Foundry Configuration Guide for the FESX, FSX, and FWSX
8 - 22 © Foundry Networks, Inc. December 2005
Figure 8.10 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’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 8.11
shows an example.
Figure 8.11 Track port priority
Configured priority = 100
Actual priority = 100 * (3/3) = 100
Configured priority = 150
Actual priority = 150 * (2/3) = 100
B
VSRP
Aware
VSRP
Master
optional link
VSRP
Aware
VSRP
Backup
BBFF
VSRP
Aware
F
X
Link down
B
VSRP
Aware
VSRP
Master
optional link
VSRP
Aware
Configured priority = 100
Actual priority = 100 * (3/3) = 100
VSRP
Backup
BBF
Track port
is up
VSRP
Aware
F
Configured priority = 100
Track priority 20
Actual priority = (100 - 0) * (3/3) = 100
F

Foundry Networks FESX Specifications

General

Brand	Foundry Networks
Model	FESX
Category	Switch
Language	English