Service module placement and the L2 adjacency problem

I'd be very interested to hear others opinions on this. You have a datacenter environment with L2 boundaries at end of row aggregators, then L3 back to the core and edge. You have 6500 service module switches hanging off the core housing ACE and FWSM modules. You want to offer firewalling and load-balancing services to servers around the datacenter.
What is the current best practice ways of resolving the L2 adjacency requirement that the firewalling and load-balancing services impose? L2TPv3? EoMPLS? Any relevant advice, deployment examples, whitepapers etc would be much appreciated!
Thanks for any replies,
George

George
You could i suppose look to use L2TPv3 if your switches support it or EoMPLS but to my mind this is actually using a band aid to fix a problem that shouldn't be there.
We too struggled in our data centres with this setup but remember you only need L2 adjacency if you are running the FWSM in transparent mode or the ACE in bridged mode.
If you are then the cleanest solutions are either
1) redesign core connections to L2
2) deploy 6500 switches in the distribution layer. I say distribution layer because it's not clear from your description what your topology actually is but i'm assuming L2 access to distro and then L3 distro to core and the core switches are the 6500 switches.
Personally i always use the routed L3 approach where possible for fast failover and no STP and in the campus environment it works really well.
However L3 from the access-layer to the distro in the data centre is very limiting and you often come across problems such as the one you are facing.
Now again it does depend on your topology but assuming the issue is your core is L3 connected and you need L2 adjacency with your distro to offer servers i would look to deploy 6500 switches in the distro layer with the service modules in them.
If i have misunderstood please come back with more details.
Jon

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Last edited by kumico (2008-03-18 10:53:47)

Service module placement and the L2 adjacency problem

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