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What is HSRP and GLBP?
HSRP provides routing redundancy for routing IP traffic without being dependent on the availability of any single router. GLBP provides routing redundancy similar to HSRP and also provides load balancing over multiple routers by using a single virtual IP address and multiple virtual MAC addresses.
What is a benefit of GLBP over protocols such as VRRP or HSRP?
GLBP (Gateway Load Balancing Protocol) prevents a single point of failure, like HSRP and VRRP, but also allows load-sharing among a group of redundant routers. Multiple first-hop routers on the LAN form a group to offer a single virtual router, also sharing the IP packet forwarding load.
What is the use of preempt in HSRP?
The standby preempt command enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. Priority is determined first by the configured priority value, and then by the IP address. In each case, a higher value is of greater priority.
Which is the default router for HSRP and VRRP?
The group IP address is configured as the default gateway in each host. In an HSRP or VRRP group, one router is elected to handle all requests sent to the group IP address. It is called the active router with HSRP and the master router with VRRP. There is at least one standby router with HSRP and similarly at least one backup router with VRRP.
Which is the highest priority VRRP R1 or R2?
The highest priority (255) assignment to R1 is a consequence of using the physical IP address of R1 as the virtual group IP address. The output of show vrrp on R2 below shows that it is a virtual router backup having priority 110.
How does GLBP prevent single point of failure?
GLBP (Gateway Load Balancing Protocol) prevents a single point of failure, like HSRP and VRRP, but also allows load-sharing among a group of redundant routers. Multiple first-hop routers on the LAN form a group to offer a single virtual router, also sharing the IP packet forwarding load.
What are the protocols for first hop redundancy?
There exists a class of redundancy protocols known as FHRPs (First Hop Redundancy Protocols) that include VRRP (Virtual Router Redundancy Protocol), HSRP (Hot Standby Router Protocol), and GLBP (Gateway Load Balancing Protocol).