HSRPv1: must be within the range from 0 through 255, uses the IP version 4 (IPv4) multicast address 224.0.0.2 for HSRP Hello messages, Hello messages do not uniquely identify the sending router, Hello messages do not include millisecond timer values, HSRPv2: must be within the range from 0 through 4095, uses the IPv4 multicast address 224.0.0.102, which is dedicated exclusively to this version, Hello messages contain a unique identifier, Hello messages include millisecond timer values, support for IPv6,

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