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Dual WAE's in mixed return methods?

Ryan Posey
Level 1
Level 1

Today we have a single 7341 attached directly to the router's Gi0/1.  The original WAE uses Forwarded return.  Lastweek we received a second 7341 (and 15 other WAE boxes for branch sites). Since we can not connect a second WAE directly to the router without adding a switch between them, we planned on eventually moving both 7341's to our internal LAN segment.  Our new 7341 will be provisioned on the internal LAN and will use GRE Negotiated Return to the routers Loopback interface.  Once the new 7341 is up and running we plan on moving our original 7341 to that same architecture.

Does this present an issue?  Will the router have an issue with service group 61 and 62 having two WCCP clients, using different return mechanisms?

7341#1 = Forwarded Return (Directly connected to router, L2)

7341#2 = GRE Negotiated Return (On Internal LAN, Routed)

1 Accepted Solution

Accepted Solutions

ktunugun
Cisco Employee
Cisco Employee

Hi Ryan,

This should not be an issue. The Packet egress method can be different on different WAEs which are part of the same WCCP service group. However please note that the packet return method should be the same. The return method is negotiated between a router and all WAAS devices on a per Service Group basis. While the WCCPv2 protocol allows different cache engines to use different packet return methods, Cisco WAAS and IOS-WCCP prevent this from happening.

Hope this helps.

Regards

Kiran.

View solution in original post

2 Replies 2

ktunugun
Cisco Employee
Cisco Employee

Hi Ryan,

This should not be an issue. The Packet egress method can be different on different WAEs which are part of the same WCCP service group. However please note that the packet return method should be the same. The return method is negotiated between a router and all WAAS devices on a per Service Group basis. While the WCCPv2 protocol allows different cache engines to use different packet return methods, Cisco WAAS and IOS-WCCP prevent this from happening.

Hope this helps.

Regards

Kiran.

Just to clarify, both of these 7341 boxes will be in the same WCCP service groups. (61 LAN & 62 WAN).  The "Return method" is GRE for both.

"However please note that the packet return method should be the same."

7341#1

wccp router-list 8 10.X.X.1 (Gi0/1 on router)

wccp tcp-promiscuous service-pair 61 62 failure-detection 30

wccp tcp-promiscuous service-pair 61 62 router-list-num 8

wccp version 2

!

7341#2

wccp router-list 1 10.X.X.129 (Loopback1 on same router)

wccp tcp-promiscuous service-pair 61 62 failure-detection 30

wccp tcp-promiscuous service-pair 61 62 router-list-num 1

wccp version 2

!

egress-method negotiated-return intercept-method wccp

!

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