Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 592)

‐ VRRP has an Owner and one or more Backup routers for each VRID. The Owner is the
router on which the VRID's IP address is also configured as a real address. All the other
routers supporting the VRID are Backup routers.
‐ VRRP-E does not use Owners. All routers are Backup routers for a given VRID. The router
with the highest priority becomes the Master. If there is a tie for highest priority, the router
with the highest IP address becomes the Master. The elected Master owns the virtual IP
address and answers pings and ARP requests.
• VRID's IP address
‐ VRRP requires that the VRID’s IP address also be a real IP address configured on the
VRID's interface on the Owner.
‐ VRRP-E requires only that the VRID be in the same subnet as an interface configured on
the VRID's interface. VRRP-E does not allow you to specify a real IP address configured
on the interface as the VRID IP address.
• VRID's MAC address
‐ VRRP uses the source MAC address as a virtual MAC address defined as
00-00-5E-00-01--vrid , where vrid is the VRID. The Master owns the virtual MAC address.
‐ VRRP-E uses the MAC address of the interface as the source MAC address. The MAC
address is hash-value-vrid , where hash-value is a two-octet hashed value for the IP
address and vrid is the VRID.
• 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 01-00-5E-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.
VRRP and VRRP-E
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