+++ This bug was initially created as a clone of Bug #1959906 +++

Description of problem:
Adding logical port may fail with:

2021-05-07T20:04:31.323426314Z stderr F I0507 20:04:31.323357      35 event.go:282] Event(v1.ObjectReference{Kind:"Pod", Namespace:"default", Name:"e2e-gateway-pod", UID:"764b0bc2-17d4-41ed-87bc-e9765aef8f8b", APIVersion:"v1", ResourceVersion:"9601", FieldPath:""}): type: 'Warning' reason: 'ErrorAddingLogicalPort' failed to handle external GW check: unable to add src-ip route to GR router, stderr:"ovn-nbctl: duplicate nexthop for the same ECMP route\n", err:OVN command '/usr/bin/ovn-nbctl --timeout=15 --may-exist --policy=src-ip --ecmp-symmetric-reply lr-route-add GR_ovn-worker2 10.244.0.15/32 172.18.0.5'

if an entry already exists. OVN should handle the case where the same entry exists and not error.

Note this was mentioned in the QE coverage of:
https://bugzilla.redhat.com/show_bug.cgi?id=1916842#c1

--- Additional comment from OpenShift Automated Release Tooling on 2021-06-18 17:53:24 UTC ---

Elliott changed bug status from MODIFIED to ON_QA.

--- Additional comment from Anurag saxena on 2021-06-21 21:11:03 UTC ---

@dbrahane Can you help confirming if OVN version is 20.12.0-140.el8fdp on latest 4.8?

--- Additional comment from Anurag saxena on 2021-06-21 21:11:21 UTC ---

*4.9 sorry

--- Additional comment from Ken Holtz on 2021-06-30 11:54:20 UTC ---

Is there any known workaround for folks hitting this issue in 4.7.13 and unable to bump to a later version right now?

--- Additional comment from Dan Brahaney on 2021-07-22 14:14:08 UTC ---

Confirmed latest 4.8 builds contain OVN 20.12.0-140.el8fdp