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Illustrated network: what is the hot backup router protocol HSRP?
2022-07-04 03:47:00 【InfoQ】
What is? HSRP?
- English full name :
Hot Standby Routing Protocol
- Chinese full name :Hot backup router protocol
- CISCO Proprietary agreement
- First hop redundancy protocol
- standard :RFC2281
What is the first hop Redundancy Protocol ?
- English full name :
First Hop Redundancy Protocols
- abbreviation :FHRP



HSRP The term
- fictitious IP: The default gateway address of the virtual device .
- fictitious MAC Address:MAC Address by HSRP Automatic generation , front 24 Bit is the default CISCO Address , Next 16 Is it HSRP ID, Last 8 Group number with hexadecimal digits .
- priority: By default , The priority value is100.
- Hello news: Regular messages exchanged by active and standby routers , These messages every 3 Every second , Tell the status of the router .
- Hold timer: The default value is 10 second , That is, about hello Of message value 3 times , This timer tells us the router , If you don't receive it on time , How long will the standby router wait hello news .
HSRP Router role

Main router
Backup router
Monitor the router
HSRP state

Initial
Standby
Learn
Active
Listen
Speak
HSRP news

Hello news
Coup news
Resign news
HSRP edition
- edition 1
- edition 2
edition 1
- Group number :
0 – 255
- fictitious MAC Address :
0000.0c07.acXX
(XX = Group number )
- Multicast address :
224.0.0.2
- Use UDP port 1985


edition 2
- Group number :
0 – 4095
- fictitious MAC Address :
0000.0c9f.fXXX
(XX = Group number )
- Multicast address :
224.0.0.102
- Use UDP port 1985


HSRP Convergence time
HSRP preemption
HSRP Router election


summary
224.0.0.2
224.0.0.102
- What is? HSRP?
- What is the first hop Redundancy Protocol ?
- HSRP The term
- HSRP Router role
- Main router
- Backup router
- Monitor the router
- HSRP state
- Initial
- Standby
- Learn
- Active
- Listen
- Speak
- HSRP news
- Hello news
- Coup news
- Resign news
- HSRP edition
- edition 1
- edition 2
- HSRP Convergence time
- HSRP preemption
- HSRP Router election
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