Investigating HSRP
Hot Standby Router Protocol (HSRP) is a Cisco propitiatory router protocol that provides first-hop redundancy for IP hosts on a LAN. It enables a set of router interfaces once configured to present a single virtual default gateway for IP hosts on the LAN. HSRP has two modes: ACTIVE – Physical router acts as the main router, by default the highest IP Address is elected the active router STANDBY – The second physical router that participates in HSRP and becomes the active router when the elected active router fails HSRP priorities can be used to determine the active router. The default priority is 100 HSRP versions: The default version used for Cisco IOS 15 is Version 1 Version 2 expands the number of supported groups from 0-255 in version 1 to 0-4095 Version 2 also supports IPv6 HSRPv1 uses Multicast address 224.0.0.2 HSRPv2 uses Multicat address 224.0.0.102 for IPv4 and FF02::66 for IPv6 HSRPv2 adds support for MD5 authentication HSRP virtual MAC addresses: Along with virtual IP addr...