Configuration Guide User guide

FastIron Configuration Guide 1655
53-1002494-02
VRRP and VRRP-E overview
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.
NOTE
VRRP-E is supported in the edge Layer 3 and full Layer 3 code only. It is not supported in the base
Layer 3 code.
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.