I have a query , we have enabled ip route cache flow on the main ATM IMA interface and we have few subinterfaces configured in it.While looking at the output of ip cache flow I see the source IP add & source interfaces to be different i.e. in the below example 172.18.96.0/22 is a subnet which resides behind AT0/IMA0.75 but I see this subnet as a source / destination IP through a different sub-interfaces.As per the network setup there is no other link for the other sub-interfaces to reach the mentioned subnet.
below is one sample output , we see lot of traffic as highlighted below
AT0/IMA0.776 172.18.96.115 Gi0/0.1 172.18.9.64 06 047D 0882 1 - In this example the mentioned IP should not reflect the source interface as Ima.776 rather it should b only IMA.75 as below.
AT0/IMA0.75 172.18.96.115 Gi0/0.1 172.18.9.64 06 047D 0887 1 - this is right information AT0/IMA0.779 172.18.11.15 AT0/IMA0.75 172.18.96.186 06 0CF6 0050 1 - this is right inforamtion
interface ATM0/IMA0 no ip address ip route-cache flow logging event subif-link-status load-interval 30 ima clock-mode common 0 ima differential-delay-maximum 150 atm vc-per-vp 1024 no atm ilmi-keepalive end
we have these many subinterfaces.ATM0/IMA0.75 is the connection to hub site and the rest are the spoke sites connecting to this router lastly this router is the only transit to reach the hub router.
No routing issues as the route table looks completly good.
And today I disbaled WAAS ,removed WCCP redirect statement and the traffic flow was normal , would like to know why we see this kind of traffic flow ? Moreover we have seen this kind of traffic flow in different routers as well the common thing on all these routers are
1. Common physical link binded with multiple sub-interfaces
2. WCCP enabled
3. IOS 12.4 25c
Let me know if anyother information is required ..
This is a bit of a theory, but I have an explanation if you have the WAE configured for "Egress-Method Negotiated-Return"
In that case the WAE returns the packet to the router in a GRE tunnel that has a destination IP of the Router ID IP. The GRE header is removed, then the router does a route lookup for the inside (true source IP) next hop interface. It then re-injects that traffic onto that interface and the packet is processed normally,
Or even more simply, is AT0/IMA0.776 the interface connected to the WAE?
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