Brocade Communications Systems FastIron SX 1600, Configuration Manual, Page: 512 / 593

Suppression of RIP advertisements for backed-up interfaces
The Brocade implementation also enhances VRRP by allowing you to configure the protocol to suppress RIP advertisements for the
backed-up paths from Backup routers. Normally, a VRRP Backup router includes route information for the interface it is backing up in
RIP advertisements. As a result, other routers receive multiple paths for the interface and might sometimes unsuccessfully use the path
to the Backup router rather than the path to the Master router. If you enable the Brocade implementation of VRRP to suppress the VRRP
Backup routers from advertising the backed-up interface in RIP, other routers learn only the path to the Master router for the backed-up
interface.
Authentication
The Brocade implementations of VRRP and VRRP-E can use simple passwords to authenticate VRRP and VRRP-E packets. VRRP-E
can also use HMAC-MD5-96 to authenticate VRRP-E packets.
VRRP and VRRP-E authentication is configured on the router interfaces. The VRRP authentication configuration of every router interface
must match. For example, if you want to use simple passwords to authenticate VRRP traffic within a router, you must configure VRRP
simple password authentication with the same password on all of the participating router interfaces.
NOTE
The HMAC-MD5-96 authentication type is supported for VRRP-E, but not supported for VRRP.
NOTE
Authentication is not supported for VRRP v3.
Independent operation of VRRP alongside RIP, OSPF, and BGP4
VRRP operation is independent of RIP, OSPF, and BGP4; therefore, RIP, OSPF, and BGP4 are not affected if VRRP is enabled on one
of these interfaces.
Dynamic VRRP configuration
All VRRP global and interface parameters take effect immediately. You do not need to reset the system to place VRRP configuration
parameters into effect.
VRRP-E overview
The most important difference between VRRP and VRRP-E is that all VRRP-E routers are Backup routers; there is no Owner router.
VRRP-E overcomes the limitations in standard VRRP by removing the Owner.
The following points explain how VRRP-E differs from VRRP:
• Owners and Backup routers
–
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.
VRRP and VRRP-E overview
FastIron Ethernet Switch Layer 3 Routing
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