HSRP
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HSRP. Redundancy & Failover: When one router or switch fails the other redundant router or switch takes over so that the connectivity is not interfered. Three protocol for redundancy are HSRP VRRP GLBP HSRP: Hot Standby Router Protocol created in 1994 It is a Cisco proprietary protocol

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HSRP

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Hsrp

HSRP

Redundancy & Failover:

When one router or switch fails the other redundant router or switch takes over so that the connectivity is not interfered.

Three protocol for redundancy are

  • HSRP

  • VRRP

  • GLBP

  • HSRP:

    Hot Standby Router Protocol created in 1994

  • It is a Cisco proprietary protocol

  • Hello timer is 3 Sec

  • Holdon Timer is 10 Sec


Hsrp

HSRP

VRRP:

Virtual Router Redundancy Protocol created in 1999

  • Its Non proprietary

  • Works between various vendors and not limited to one.

  • Created by IETF

  • Hello Timer 1 sec

  • Holdon Timer 3 sec

    GLBP:

    Gateway Load Balance Protocol created in 2005

    Cisco proprietary

    Same Features as HSRP

    Allows Load Balancing


Hsrp

HSRP

Scenario:

Two Switches (Layer 3) A & B

Switch A:

Switch A has Vlan 50 as interface and its IP address is set to 192.168.100.2

Shared Group 10

Switch B:

Switch B has Vlan 50 as interface and its IP address is set to 192.168.100.3

Shared Group 10

Virtual IP Address is 192.168.100.1


Hsrp

HSRP

Virtual IP Address & Virtual Mac Address:

In Virtual Mac Address e.g 0000.0C07.AC0A

First 6 are vendor ID, 07AC is HSRP ID and 0A is Group 10 (HEX)

It is generated on both Switches , so when the Active Switch fails the IP becomes available on Standby Switch. Clients don’t need to change any Gateway settings on their devices.

Hello Messages are sent every 3 sec , Gateway is assumed Dead if no response is received in 10 secs.

However we can tune the timers for fast processing.


Hsrp

HSRP

HSRP CONFIGURATION:

A quick note : vlan 50 and intvlan 50 are different vlan 50 is only the segementation of ports (layer 2) , intvlan 50 is routed interface for that vlan.

SwitchA(Config)# intvlan 50  [intvlan 50 will take us into routed int]

SwitchA(Config-if)# standby 10 ip 192.168.100.1 

Note for above [10 is Group number, standby command is used to enable HSRP, Virtual IP / Phantom IP is 192.168.100.1]

Note: Every Switch will have default priority of 100 so to make switch active we higher the priority

Switch A(config-if)# standby 10 priority 150 

Exit


Hsrp

HSRP

HSRP CONFIGURATION:

On Switch B

SwitchB(Config)# intvlan 50  [intvlan 50 will take us into routed int]

SwitchB(Config-if)# standby 10 ip 192.168.100.1 

Note for above [10 is Group number, standby command is used to enable HSRP, Virtual IP / Phantom IP is 192.168.100.1]

SwitchB(config-if)# standby 10 priority 100 

Exit

HSRP is Setup we can verify it by pinging to virtual ip and then we can disconnect Switch A and can see take over from Switch B.

Thanks,

Hyp3ri0n

www.itpings.com


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