Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 95)

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.
NOTE
802.1Q-n-Q tagging and Aggregated VLANs are not supported on the Brocade ICX 6430-C devices.
• The VLAN supports IGMP snooping version 2 and version 3 when VSRP or VSRP-aware is
configured on a VLAN.
Layer 2 and Layer 3 redundancy
You can configure VSRP to provide redundancy for Layer 2 only or also for Layer 3:
• Layer 2 only - The Layer 2 links are backed up but specific IP addresses are not backed up.
• Layer 2 and Layer 3 - The Layer 2 links are backed up and a specific IP address is also backed up.
Layer 3 VSRP is the same as VRRP-E. However, using VSRP provides redundancy at both layers at
the same time.
Layer 2 Switches support Layer 2 VSRP only. Layer 3 Switches support Layer 2 and Layer 3
redundancy. You can configure a Layer 3 Switch for either Layer 2 only or Layer 2 and Layer 3. To
configure for Layer 3, specify the IP address you are backing up.
NOTE
If you want to provide Layer 3 redundancy only, disable VSRP and use VRRP-E.
Master election and failover
Each VSRP device advertises its VSRP priority in Hello messages. During Master election, the VSRP
device with the highest priority for a given VRID becomes the Master for that VRID. After Master
election, the Master sends Hello messages at regular intervals to inform the Backups that the Master is
healthy.
If there is a tie for highest VSRP priority, the tie is resolved as follows:
• Layer 2 Switches - The Layer 2 Switch with the higher management IP address becomes the Master.
‐ Switches with management IP addresses are preferred over switches without management
IP addresses.
‐ If neither of the switches has a management IP address, then the switch with the higher
MAC address becomes the Master. (VSRP compares the MAC addresses of the ports
configured for the VRID, not the base MAC addresses of the switches.)
• Layer 3 Switches - The Layer 3 Switch whose virtual routing interface has a higher IP address
becomes the master.
VSRP configuration notes and feature limitations
FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide 95
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