Saturday, March 15, 2008

WAAS GRE egress return

Starting from WAAS 4.0.13, it allows 2 different egress method. When IP forwarding egress method is used the return traffic packets are forwarded to the WAE default gateway.

WAE(config)# egress-method ip-forwarding intercept-method wccp

The limitation of IP forwarding is WAE should reside on a separate subnet to avoid infinite forwarding loop.

The other egress method is GRE return. The return traffic packets are returned back to the intercepting router using the GRE tunnel that is created as a result of WCCP negotiation. With GRE return egress, WAE can be deployed on the same subnet as users and subinterfaces or tertiary interfaces are not required.

WAE(config)# egress-method negotiated-return intercept-method wccp

To view egress method on WAE
WAE# sh egress-methods

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