With MX in ECMP, traffic from VM to BMS is getting routed

[Praveen]

Scenario:

The setup has following configuration,

1. VN with subnet 1.1.1.0/24
2. There are 2 MX and both of them have 1.1.1.1/24 configured.
3. A VM with 1.1.1.2 pings to BMS with IP 1.1.1.5
4. ARP inside VM for 1.1.1.5 points to VRRP MAC instead of BMS MAC resulting in packet being routed

Problem:
1. Both MX export route for 1.1.1.0/24
2. On the compute node, 1.1.1.0/24 will be a ECMP route
3. When VM ARPs for 1.1.1.5, local vrouter will respond with VRRP MAC since its a ECMP route

Fix:
Force routes with IPAM Subnet to flood ARP even if its an ECMP route

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/11601
Submitter: Praveen K V (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/11601
Committed: http://github.org/Juniper/contrail-controller/commit/b14b9a8114b2556586696a150572a285e678bf1b
Submitter: Zuul
Branch: R2.20

commit b14b9a8114b2556586696a150572a285e678bf1b
Author: Praveen K V <email address hidden>
Date: Sun Jun 14 13:45:43 2015 +0530

Flood ARP for IPAM Subnet routes in all cases

When we have 2 gateways for a network in ECMP, packets from VM to BMS
are getting routed. The root cause is, in agent gets a ECMP route for
IPAM subenet. When VM does ARP for BMS, vrouter does proxy ARP with VRRP
MAC due to ECMP Route.

Fix:
VRouter should flood ARP packet if IP address belongs to IPAM Subnet
even if the route lookup hits ECMP

Change-Id: Ibc018048694c72be4514d2e66d51beec527bbc6f
Closes-Bug: #1464972

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/11867
Submitter: Praveen K V (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/11867
Committed: http://github.org/Juniper/contrail-controller/commit/3914eab143d50e5311427f621b16b29339b011db
Submitter: Zuul
Branch: master

commit 3914eab143d50e5311427f621b16b29339b011db
Author: Praveen K V <email address hidden>
Date: Sun Jun 14 13:45:43 2015 +0530

Flood ARP for IPAM Subnet routes in all cases

When we have 2 gateways for a network in ECMP, packets from VM to BMS
are getting routed. The root cause is, in agent gets a ECMP route for
IPAM subenet. When VM does ARP for BMS, vrouter does proxy ARP with VRRP
MAC due to ECMP Route.

Fix:
VRouter should flood ARP packet if IP address belongs to IPAM Subnet
even if the route lookup hits ECMP

Closes-Bug: #1464972
Change-Id: Ibc018048694c72be4514d2e66d51beec527bbc6f