Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 811)

Multi-Service IronWare Routing Configuration Guide 783
53-1003033-02
Comparison of VRRP and VRRP-E
ARP behavior with VRRP-E
In the VRRP-E implementation, the source MAC address of the gratuitous ARP sent by the VRRP-E
master router will be the VRRP-E virtual MAC address. When the router (either master or backup
router) sends an ARP request or reply packet, the sender's MAC address will be the MAC address of
the interface on the router. When an ARP request packet for the virtual router IP address is
received by the backup router, it will be forwarded to the master router to resolve the ARP. Only
master router will answer the ARP request for the virtual router IP address.
Comparison of VRRP and VRRP-E
VRRP-E is similar to VRRP, but differs in the following respects:
• Owners and Backups:
• VRRP has an Owner and one or more Backups for each virtual router. The Owner is the
router that has the IP address used for the virtual router. All the other routers supporting
the virtual router are Backups.
• VRRP-E does not use Owners. All routers are Backups for a given virtual router. 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 ping and ARP requests and so on.
• Master and Backups:
• VRRP – The “Owner” of the IP address of the VRID is the default Master and has the
highest priority (255). The precedence of the Backups is determined by their priorities. The
default Master is always the Owner of the IP address of the VRID.
• VRRP-E – The Master and Backups are selected based on their priority. You can configure
any of the Brocade devices to be the Master by giving it the highest priority. There is no
Owner.
• Virtual Router’s IP address:
• VRRP requires that the virtual router has an IP address that is configured on the Owner
router.
• VRRP-E requires only that the virtual router’s IP address be in the same subnet as an
interface configured on the VRID's interface. In fact, VRRP-E does not allow you to specify
an IP address configured on the interface as the VRID IP address.
• VRID's MAC Address:
• VRRP uses the interfaces’s actual MAC address as the source MAC address. The virtual
MAC address for IPv4 VRRP is 00-00-00-00-01- and for IPv6 VRRP is
00-00-00-00-02-.The is the ID of the virtual router. The Master owns the
Virtual MAC address.
• VRRP-E uses the interface’s actual MAC address as the source MAC address. The virtual
MAC address for IPv4 VRRP-E and IPv6 VRRP-E is 02-E0-52--, where
is a two-octet hashed value for the IP address and is the virtual
router ID.
NOTE
You cannot reuse the same VRID across IPv4 VRRP-E and IPv6 VRRP-E, if they are in the
same broadcast domain.