MSFC redundancy options on 6500 switches

[JUSTIN LOUCKS]

I have a 6500 switch with redundant SUP2-MSFC/PFC2 modules in it. We use the MSFC cards to provide core routing and use HSRP to provide high availability for L3 functions. As our network grows, we have foind that we now have over 20 internal VLANs that we want to provide a default gateway services to, but it seems we can only enable HSRP features on 16 interfaces of the MSFCs.

Is this a limitation of HSRP itself or the version of MSFC I'm running? Do features such as VRRP or GLBP provide higher numbers?

Any feedback on this would be appreciated.

[Anand Narayana]

simple, instead of specifying for each every vlan as different standy group vlan 2 standby group 2, vlan 3 standby group 3...something like.....

interface vlan 2

standby 2 ip

standby 2 timers 5 15

standby 2 priority 110

standby 2 preempt

interface vlan 3

standby 3 ip

standby 3 timers 5 15

standby 3 priority 110

standby 3 preempt

------------------------------------------------------

you jus specify the same standby group as for interface vlan 2,3,4 standby group as 2, then for vlan 5,6,7 as standby group 3...something like this....

interface vlan 2

standby 2 ip

standby 2 timers 5 15

standby 2 priority 110

standby 2 preempt

interface vlan 3

standby 2 ip

standby 2 timers 5 15

standby 2 priority 110

standby 2 preempt

hope this helps,

rate this post.

[amit-singh · Accepted solution]

Hi Friend,

There is a 16 HSRP group limitation on sup2/msfc2 due to PFC2.PFC2 supports only 16 HSRP group.

To overcome this limitation, you can reuse the HSRP group number under the vlan interfaces.

For example:

Int vlan 1

standby 1 ip x.x.x.x

Int vlan 20

standby 1 ip y.y.y.y

http://www.cisco.com/en/US/products/hw/switches/ps700/products_qanda_item09186a008011c6bb.shtml

GLBP is supported on MSFC2 starting with 12.2.17SXB or later IOS. GLBP provides higher numbers.

HTH, Please rate if it does.

-amit singh