Configuration Guide User guide

432 BigIron RX Series Configuration Guide
53-1002484-04
Overview of Virtual Switch Redundancy Protocol (VSRP)
15
FIGURE 76 VSRP priority
However, if one of the VRID’s ports goes down on one of the Backups, that Backup’s priority is
reduced. If the Master’s priority is reduced enough to make the priority lower than a Backup’s
priority, the VRID fails over to the Backup. Figure 77 shows an example.
FIGURE 77 VSRP priority recalculation
VSRP
Master
VSRP
Backup
optional link
VSRP
Aware
VSRP
Aware
VSRP
Aware
F
F
F
B
B
B
Configured priority = 100
Actual priority = 100 * (3/3) = 100
Configured priority = 100
Actual priority = 100 * (3/3) = 100
Internet
or
enterprise Intranet
Internet
or
enterprise Intranet
Router 1
Router 2
e 2/4
e 3/2
Owner
Backup
192.53.5.1 192.53.5.3
e 1/6
e 1/5
Host1
Default Gateway
192.53.5.1
VRID1
Router1 = Master
IP address = 192.53.5.1
MAC address = 00-00-5E-00-01-01
Priority = 255
VRID1
Router2 = Backup
IP address = 192.53.5.1
MAC address = 00-00-5E-00-01-01
Priority = 100