VPP interface by default is in L3 mode and has to be set into L2 mode for either bridging or cross connect. The reason, setting up an interface cross connected to the 2nd interface only does not work, is that the second interface is not in L2 mode. Thus, L2 forwarding cannot output packets on the 2nd interface. If you do not want the 2nd interface sending its packets back to the 1st interface, I believe (have not tried it) you can xconnect it to the local0 interface. Then input packet on the 2nd interface should be dropped.
Regards, John From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Manjunath Munavalli Sent: Saturday, August 11, 2018 5:20 PM To: vpp-dev@lists.fd.io Subject: [vpp-dev] query regarding L2 xconnect feature Hi, I want to use the L2 xconnect feature only in one direction, i.e suppose i have 2 ports x and y, i want to only do "set interface l2 xconnect X Y" so that all traffic from port X is sent to port Y. If I do this only one direction it is not working. It works only if i do it both the direction X->Y and Y->X. May i know why it doesn't work if we set l2 xconnect only in one direction. Regards, Manju
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