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Knowledge point carding

Hot backup routing protocol

HSRP (Hot Standby Routing Protocol)

Cisco private protocol HSRP group member

Active router

Backup router

Virtual router

Other router HSRP messages

All routers in HSRP send or receive HSRP messages

UDP port number 1985

Use Multicast to send HSRP messages, Multicast address 224.0.0.2

TTL=1HSRP statu

Initial state

Learning state

Monitoring statu

Speaking status

Backup statu

Active HSRP timer

Hello interval (default 3s)

Hold time (default 10s) Hot backup routing protocol HSRP

Cisco Private Protocol Virtual routing redundancy Protocol VRRP

Developed by IETF, RFC 2338

The implementation principle and process are basically the same as those of HSRP.

Different from HSRP in protocol details HSRP port tracking

HSRP priority is reduced when the trace port is not available

Active routers can automatically adjust HSRP preemption according to line conditions: high priority routers regain forwarding rights and become members of active routers configured as HSRP

Switch (config-if) # standby group-number ip virtual-ip-address configure the priority of HSRP

Switch (config-if) # standby group-number priority priority-valueHSRP preemptive configuration

Switch (config-if) # standby group-number preemptHSRP timer configuration configure Hello interval and hold time

Switch (config-if) # standby group-number times hellotime holdtime configure HSRP port tracking

Switch (config-if) # standby group-number track type mod/num interface-priority

View HSRP summary information

Switch#show standby [type mod/num] [group-number] brief

View HSRP details

Switch#show standby

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