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HSRP

ITA Terms
Community Member

‎06-09-2009 02:49 AM - edited ‎03-01-2019 03:34 PM

Complete Definition

The Hot Standby Router Protocol (HSRP) provides network redundancy for IP networks, ensuring that user traffic immediately and transparently recovers from first hop failures in network edge devices or access circuits.

For more information, see the HSRP page on cisco.com.

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Prashant Sheshasayee
Level 1
Level 1
‎10-22-2016 06:00 AM

HSRP

  • CISCO Proprietary
  • UDP Port No 1985
  • It has Hello Timer 3 Sec and Hold Timer 3 Sec
  • It has one Active Router and Standby Router
  • Default Priority is 100
  • By Default the Preempt is Disabled.
suman20kundu@yahoo.co.in
Level 1
Level 1
‎08-10-2021 07:45 AM

We run HSRP in R1 and R2, both are connected a L2 switch. Switch port 1 is connected with R1 and port 2 connected R2. R1 is currently active for HSRP. switch forward all packet to port no 1 (active gateway) because of switch have MAC table and the HSRP MAC address is stored against the port no 1. R1 goes down but LAN device is sending continuedly packet to gateway and switch also send the packet through port 1 as per MAC table. by default switch MAC table aging is 300 second. After 10 second R2 will be act as a active gateway for HSRP.

 

Question is:

1. How L2 switch understand HSRP mac now reachable through port 2?

2. Then how switch move the same mac address against port no 2 without having MAC flapping error?

 

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