Brocade BigIron RX Series Configuration Guide - Manual (Page 512)

434 BigIron RX Series Configuration Guide
53-1002484-04
Overview of Virtual Switch Redundancy Protocol (VSRP)
15
FIGURE 79 Track port priority
In Figure 79 , 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 80 .
FIGURE 80 Track port priority subtracted during priority calculation
MAC address failover on VSRP-aware devices
VSRP-aware devices maintain a record of each VRID and its VLAN. When the device has received a
Hello message for a VRID in a given VLAN, the device creates a record for that VRID and VLAN and
includes the port number in the record. Each subsequent time the device receives a Hello
message for the same VRID and VLAN, the device checks the port number:
VSRP
Master
VSRP
Backup
optional link
VSRP
Aware
VSRP
Aware
VSRP
Aware
F F F B B B
Configured priority = 100
Track priority 20
Actual priority = (100 - 0) * (3/3) = 100
Configured priority = 100
Actual priority = 100 * (3/3) = 100
Track port
is up
X
VSRP
Master
VSRP
Backup
optional link
VSRP
Aware
VSRP
Aware
VSRP
Aware
Configured priority = 100
Track priority 20
Actual priority = (100 - 20) * (3/3) = 80
Configured priority = 100
Actual priority = 100 * (3/3) = 100
Track link
is down
B B B
F F F