Configuration Guide User guide

634 FastIron Configuration Guide
53-1002494-02
VSRP
Figure 50 shows an example of a VSRP configuration.
FIGURE 50 VSRP mesh – redundant paths for Layer 2 and Layer 3 traffic
In this example, two Brocade 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 Brocade 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 Brocade devices can use the redundant paths provided by the VSRP devices. In this
example, three Brocade devices use the redundant paths. A Brocade device that is not itself
configured for VSRP but is connected to a Brocade device that is configured for VSRP, is VSRP
aware. In this example, the three Brocade devices connected to the VSRP devices are VSRP aware.
A Brocade 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 Brocade devices connected to the
VSRP devices has a separate link to each of the VSRP devices.
VSRP 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