Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 436)

418 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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VRRP and VRRP-E overview
• Hello packets
- VRRP sends Hello messages to IP Multicast address 224.0.0.18.
- VRRP-E uses UDP to send Hello messages in IP multicast messages. The Hello packets
use the MAC address of the interface and the IP address as the source addresses. The
destination MAC address is 00-00-00-00-00-02, and the destination IP address is
224.0.0.2 (the well-known IP multicast address for “all routers”). Both the source and
destination UDP port number is 8888. VRRP-E messages are encapsulated in the data
portion of the packet.
• Track ports and track priority
- VRRP changes the priority of the VRID to the track priority, which typically is lower than the
VRID priority and lower than the VRID priorities configured on the Backup routers. For
example, if the VRRP interface priority is 100 and a tracked interface with track priority 20
goes down, the software changes the VRRP interface priority to 20.
- VRRP-E reduces the priority of a VRRP-E interface by the amount of a tracked interface
priority if the tracked interface link goes down. For example, if the VRRP-E interface
priority is 200 and a tracked interface with track priority 20 goes down, the software
changes the VRRP-E interface priority to 180. If another tracked interface goes down, the
software reduces the VRID priority again, by the amount of the tracked interface track
priority.
• VRRP-E can use HMAC-MD5-96 for authenticating VRRP-E packets. VRRP can use only simple
passwords.