Dell FCX624-E Laptop User Manual


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358 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Virtual Switch Redundancy Protocol (VSRP)
10
FIGURE 68 VSRP mesh – redundant paths for Layer 2 and Layer 3 traffic
In this example, two Dell PowerConnect devices are configured as redundant paths for VRID 1. On
each of the devices, a Virtual Router ID (VRID) is configured on a port-based VLAN. Since VSRP is
primarily a Layer 2 redundancy protocol, the VRID applies to the entire VLAN. However, you can
selectively remove individual ports from the VRID if needed.
Following Master election (described below), one of the Dell PowerConnect devices becomes the
Master for the VRID and sets the state of all the VLAN ports to Forwarding. The other device is a
Backup and sets all the ports in its VRID VLAN to Blocking.
If a failover occurs, the Backup becomes the new Master and changes all its VRID ports to the
Forwarding state.
Other Dell PowerConnect devices can use the redundant paths provided by the VSRP devices. In
this example, three Dell PowerConnect devices use the redundant paths. A Dell PowerConnect
device that is not itself configured for VSRP but is connected to a Dell PowerConnect device that is
configured for VSRP, is VSRP aware. In this example, the three Dell PowerConnect devices
connected to the VSRP devices are VSRP aware. A Dell PowerConnect device that is VSRP aware
can failover its link to the new Master in sub-second time, by changing the MAC address associated
with the redundant path.
When you configure VSRP, make sure each of the non-VSRP Dell PowerConnect devices connected
to the VSRP devices has a separate link to each of the VSRP devices.
Configuration notes and feature limitations
VSRP and 802.1Q-n-Q tagging are not supported together on the same device.
VSRP and Super Aggregated VLANs are not supported together on the same device.
When VSRP or VSRP-aware is configured on a VLAN, the VLAN will support IGMP snooping
version 2 only. IGMP version 3 will not be supported on the VLAN.
VSRP
Master
VSRP
Backup
optional link
VSRP
Aware
VSRP
Aware
VSRP
Aware
Hello packets
F
F
F
B
B
B