Dell PowerConnect B-RX BigIron RX Series Configuration Guide v02.7.02 - Page 489

Overview of Virtual Switch Redundancy Protocol (VSRP) 15 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 78 shows an example. FIGURE 78 Track port priority Configured priority = 100 Track priority 20 Actual priority = (100 - 0) * (3/3) = 100 Configured priority = 100 Actual priority = 100 * (3/3) = 100 VSRP Master optional link VSRP Backup Track port is up FF F B BB VSRP Aware VSRP Aware VSRP Aware In Figure 78, 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 79. FIGURE 79 Track port priority subtracted during priority calculation Configured priority = 100 Track priority 20 Actual priority = (100 - 20) * (3/3) = 80 Configured priority = 100 Actual priority = 100 * (3/3) = 100 X VSRP Backup optional link VSRP Master Track link is down B BB FF F VSRP Aware VSRP Aware VSRP Aware BigIron RX Series Configuration Guide 417 53-1001810-01