hsrp question

[Leonardo Pena Davila]

Hi, I want to configure two MSFC`s in the same chasis. By example I have in the first MSFC

Interface Vlan 56

ip address 156.175.20.1 255.255.255.0

ip helper-address 156.175.28.202

If I want to configure the second MSFC for HSRP do I have to change the ip addresse of my Interface Vlan 56.

For those devices that have default gateway 156.175.20.1 do I have to add a new default gateway.

Thanks a lot

Regard

LP

[mhussein]

I think it is better if you change the vlan interface ip address so that you don't have to change the default gateway on the devices.

e.g:

first MSFC

interface vlan56

ip address 156.175.20.253 255.255.255.0

standby 10 156.175.20.1

standby 10 priority 110

second MSFC

interface vlan56

ip address 156.175.20.254 255.255.255.0

standby 10 156.175.20.1

standby 10 priority 100

Regards,

Mustafa

[darby.weaver]

Mustafa is correct. This configuration works great.

Another alteration is that same config works as well when applied to two MSFC's in two different chassis as well.

[ankurbhasin]

Hi Darby,

I will say it depends on the way you have configured your MSFC.

IF you are running SRM which is single router mode only one msfc will be active , you just need to configure your first MSFC and it will sync the config to the secondary MSFC and in that acse your ip on interface will also be synched and will remain the same on both the msfc but the interface will remain in line protocol down state in standby msfc.

Also in that case you need to configure HSRP because your one msfc in standby state and will immediately come up once your active msfc will go down.

Yes of course you can configure HSRP if you are running DRM (dual router mode) or you have 2 seperate chassis in which your both msfc remains active and then for loand balancing and redundancy HSRP is required.

For SRM you do not need HSRP as same ip will get sync in standby msfc and you can keep the common ip address as gateway on your machines which you will configure on your interface vlan x.

For more inf on SRM and DRM on MSFC (single chassis)

have a look at this link. You need a CCO login for the same

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_7_2/confg_gd/redund.htm#1071742

HTH

Ankur