Having just one HSRP Group: MAC Address problems?

abatson · ‎07-02-2003

The following config was reccomended by a fellow CCO member. However, my Cisco SE told me that he preferred that each virtual IP below, be in its own HSRP group, lest I have problems with MAC Address overlap. See config below. Thoughts?

interface Vlan500

description Connection to Flat Network

ip address 198.186.47.2 255.255.255.0

ip address 198.186.44.2 255.255.255.0 secondary

ip address 198.186.45.2 255.255.255.0 secondary

ip address 198.186.46.2 255.255.255.0 secondary

ip address 198.186.43.2 255.255.255.0 secondary

ip address 198.186.59.2 255.255.255.0 secondary

ip address 198.186.61.2 255.255.255.0 secondary

no ip redirects

mls rp management-interface

standby 1 ip 198.186.47.1

standby 1 ip 198.186.44.1 secondary

standby 1 ip 198.186.45.1 secondary

standby 1 ip 198.186.46.1 secondary

standby 1 ip 198.186.43.1 secondary

standby 1 ip 198.186.59.1 secondary

standby 1 ip 198.186.61.1 secondary

standby 1 priority 106

standby 1 preempt

--Alex

jhalldn · ‎07-02-2003

Hey Alex!

As i recall the limit is 16 additional macaddresses (ie HSRP addresses) and then the switch cant handle more on the same interface. Though you cand name the groups 0-255 (0=none group).

Any thoughts about splitting all net/prefixes in each vlan ?

I would probably set a VLAN for each prefix and then route/switch all traffic between the VLANs (using MLS). The use HSRP on each VLAN interface/for each net.

But i dont have the whole picture,so...maybe i miss the important things.

Regards;

abatson · ‎07-02-2003

So it would seem that Cisco will support up to 16 IPs in one single HSRP group? I realize this config looks strange, but migrating to VLANs is phase-II I want to ensure as best as possible that we don't have any surprises when I try to implement this config....

-alex