Dell PowerConnect B-RX Configuration Manual page 486

15
Overview of Virtual Switch Redundancy Protocol (VSRP)
VSRP priority calculation
Each VSRP device has a VSRP priority for each VRID and its VLAN. The VRID is used during Master
election for the VRID. By default, a device's VSRP priority is the value configured on the device
(which is 100 by default). However, to ensure that a Backup with a high number of up ports for a
given VRID is elected, the device reduces the priority if a port in the VRID's VLAN goes down. For
example, if two Backups each have a configured priority of 100, and have three ports in VRID 1 in
VLAN 10, each Backup begins with an equal priority, 100. This is shown in
FIGURE 75
414
VSRP priority
Configured priority = 100
Actual priority = 100 * (3/3) = 100
VSRP
Master
F F F
VSRP
Aware
Configured priority = 100
Actual priority = 100 * (3/3) = 100
optional link
B
VSRP
Aware
BigIron RX Series Configuration Guide
Figure 75
VSRP
Backup
B
B
VSRP
Aware
53-1001810-01