MPLS Redundancy Using HSRP
HSRP provides network redundancy in a way that ensures that user traffic immediately and transparently recovers from first-hop failures in network edge devices and access circuits. By sharing an IP address and a MAC (Layer 2) address, two or more routers can act as a single virtual router to the hosts on a LAN. The members of the router group continually exchange status messages by detecting when a router goes down. This HSRP group consists of an active router and a standby router to replace the active router should it fail. The address of this HSRP group is called the virtual IP address.
Hot Standby Router Protocol (HSRP) support on an MPLS VPN interface is useful when an Ethernet is connected between two PE routers using either a CE with a default route to the HSRP virtual IP address or one or more hosts with the HSRP virtual IP address configured as the default gateway.
Continue reading here: Figure B1B VSI Controllers
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