netdev - Different behavior wrt VRF and no VRF

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Message-ID: <CAE_QS3ccJB8GqVrJ_95P7K=NmXC0TP_NyoAiVbTqhk09JRodrA@mail.gmail.com>
Date:   Thu, 15 Apr 2021 12:45:44 +0530
From:   Bala Sajja <bssajja@...il.com>
To:     netdev@...r.kernel.org
Subject: Different behavior wrt VRF and no VRF - packet Tx

When interfaces are not part of VRF  and below ip address config is
done on these interfaces, ping with -I (interface) option, we see
packets transmitting out of the right interfaces.

 ip addr add 2.2.2.100 peer 1.1.1.100/32 dev enp0s3
 ip addr add 2.2.2.100 peer 1.1.1.100/32  dev enp0s8

 ping 1.1.1.100    -I  enp0s3 , packet always goes out of  enp0s3
 ping 1.1.1.100    -I   enp0s8, packet always goes out of  enp0s8

When interfaces are enslaved  to VRF  as below and ip are configured
on these interfaces, packets go out of one  interface only.

 ip link add MGMT type vrf table 1
 ip link set dev MGMT up
 ip link set dev enp0s3 up
 ip link set dev enp0s3 master MGMT
 ip link set dev enp0s8 up
 ip link set dev enp0s8 master MGMT
 ip link set dev enp0s9 up

 ip addr add 2.2.2.100 peer 1.1.1.100/32 dev enp0s3
 ip addr add 2.2.2.100 peer 1.1.1.100/32  dev enp0s8

 ping 1.1.1.100    -I  enp0s3 , packet always goes out of  enp0s3
 ping 1.1.1.100    -I   enp0s8, packet always goes out of  enp0s3


Regards,
Bala.