Migration from VRRP to HSRP

[jahanzeb.feroze]

Dear All,

Is there anyway to migrate from Cisco VRRP to HSRP, actually i have Vrrp configure on my switch and needs to migrate to Hsrp. Please guide me how to do this ?

Regards

Jahanzeb

[Mark Malone]

You can have vrrp and hsrp running under the same interface simultaneously but obviously not overlapping subnets.

If your planning on using same ip address range then there will need to be a cutover from vrrp to hsrp which will mean downtime , if your using new ip address space you could minimise imapct by setting it all up and then disabling hsrp vip ip

[jahanzeb.feroze]

Means i have to configure each and every interface separtely ? isnt there any way to do this automaticcally, likke running any command globally?

[Mark Malone]

you could do it automatically if you have Cisco prime or works and roll it out but there is no global conversion command between FHRPS

[jahanzeb.feroze]

Want to do it on core switch, will any command or scripts works?

[InayathUlla Sharieff]

There is no automatic way.

If its core dont take any chance plan a mw..then start with hsrp config on interfaces once the hsrp works fine remove  the vrrp config.

[jahanzeb.feroze]

Hi InayathUlla Sharieff

Want to use same pool of IPs in HSRP, is it possible to keep both config i-e VRRP and HSRP with the same IP pool and later delete the VRRP ?

[InayathUlla Sharieff]

Jahanzeb,

Want to use same pool of IPs in HSRP, is it possible to keep both config i-e VRRP and HSRP with the same IP pool and later delete the VRRP ?

Answer:- No you cannot have this. Same ip address used by two protocol on interface is not supported.

Example:-

6500-1#sh run int vlan 2

interface Vlan2
description abc
ip address 146.123.99.3 255.255.255.128

standby 0 ip 146.123.99.1  >> HSRP ip

Now  I will try to configure VRRP with same ip:-

6500-1(config-if)#vrrp 10 ip 146.123.99.1
% 146.123.99.1 is assigned to another application on Vlan2  >> Error.

HTH

Regards

Inayath

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Posting

Automatically?  Not that I'm aware.  Depending on device, you may be able to write a script that would reconfigure all your ports.

BTW, when doing something like this, don't forget to deactivate all standbys first, otherwise, when you flip the active gateway, a standby will try to take over.

Going from VRRP to HSRP may have minmal impact because HSRP will send a gratious ARP with its activation.  Of course, you may have hosts that won't process the gratious ARP.

BTW, unsure whether VRRP will send a gratious ARP when its activated.  So, going from HSRP to VRRP might disconnect all your hosts.

[jahanzeb.feroze]

Means no downtime required for this configuration ?