[nsp] HSRP 6500/SUP2

Tue Sep 23 11:41:58 EDT 2003

You can run more than 16 groups, as long as you do not give them group
names, as stated below the group number becomes part of the MAC HSRP group
address for example group 1 would be 0000.0c07.ac01 and group 2 would be
0000.0c07.ac02.

So as long as you can handle the virtual MAC being the same across all vlans
then you will be ok to configure multiple instances of HSRP with NO group
numbers.

>From the switches point of view you will have this same VMAC per VLAN in the
system CAM table as per the following example:

 sh cam sys 601
* = Static Entry. + = Permanent Entry. # = System Entry. R = Router Entry.
X = Port Security Entry $ = Dot1x Security Entry

VLAN  Dest MAC/Route Des    [CoS]  Destination Ports or VCs / [Protocol
Type]
----  ------------------    -----
-------------------------------------------
601   00-00-0c-07-ac-00 R#          15/1
601   00-05-5f-50-4b-fc R#          15/1

Regards

-----Original Message-----
From: Pavan Reddy [mailto:pavan at mindspring.com] 
Sent: 23 September 2003 09:14
To: Charles Von Dartmooth
Cc: cisco-nsp at puck.nether.net
Subject: RE: [nsp] HSRP 6500/SUP2

You can use the same HSRP group on each vlan...

Each vlan will only have 2 hsrp speakers (your 2 msfc's) right?

Then no problem - HSRP group just specifies the HSRP mac.

The HSRP mac (or any mac for that matter) doesn't need to be unique across
vlans...

Pavan

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net]On Behalf Of Charles Von 
> Dartmooth
> Sent: Monday, September 22, 2003 4:33 PM
> To: cisco-nsp at puck.nether.net
> Subject: [nsp] HSRP 6500/SUP2
>
>
> Greetings,
>
>  I am interested in setting up HSRP with 2 6500
> SUP2-MSFC2 which provider L3 connectivity for a lan enviornment to the 
> rest of the network. There are a few hundered VLANs setup. Given the 
> 16 group limitation on the SUP2, what is the best way to set it
> up so that redudancy can be provided to each
> individual VLAN without effecting the rest of them?
> (IE I wish to shutdown 1 vlan on 1 switch, without the
> other taking over for all the rest.) How are the VLANs
> tied toghter if I use 1 group for all?
>
> TIA, Charles
>
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