WAAS / WCCP service groups / L2 adjacencies

[dale.shaw]

Hi all,

I'm having trouble finding a definitive answer on this one. I'm working on a WAAS deployment in a network with asymmetric routing. I want to deploy WAAS accelerators at two geographically dispersed data centre sites (head end). Do the WAAS boxes themselves need to be L2 adjacent with each other in this configuration? i.e. can the service group consist of two routers (one at each DC) and two WAEs (one at each site), with routed links between the DCs (WAEs in separate IP subnets)?

Something like:

- two routers (rtr-A, rtr-B)

- two WAAS accelerators (waas-A, waas-B)

- rtr-A and waas-A are L2 adjacent and use WCCP w/L2 redirection

- rtr-B and waas-B are L2 adjacent and use WCCP w/L2 redirection

- rtr-A and waas-B are not L2 adjacent and use WCCP w/GRE redirection

- rtr-B and waas-A are not L2 adjacent and use WCCP w/GRE redirection

Here's a quick diagram:

http://i4.tinypic.com/62nhf5u.jpg

(all links are L3/routed)

cheers!

[Zach Seils]

Dale,

There is no requirement for the WAE's to be L2 adjacent to each other. Note that the WCCP Forwarding Method is negotiated per Service Group -- so it can either be L2 or GRE. Based on your description, you would want to use GRE Forwarding.

Regards,

Zach