[ovs-build] Failed: dceara/ovn#83 (arp_nd_broadcast_limit-v2 - 4caed9e)

[Travis CI]

Build Update for dceara/ovn
-------------------------------------

Build: #83
Status: Failed

Duration: 29 mins and 9 secs
Commit: 4caed9e (arp_nd_broadcast_limit-v2)
Author: Dumitru Ceara
Message: ovn-northd: Limit ARP/ND broadcast domain whenever possible.

ARP request and ND NS packets for router owned IPs were being
flooded in the complete L2 domain (using the MC_FLOOD multicast group).
However this creates a scaling issue in scenarios where aggregation
logical switches are connected to more logical routers (~350). The
logical pipelines of all routers would have to be executed before the
packet is finally replied to by a single router, the owner of the IP
address.

This commit limits the broadcast domain by bypassing the L2 Lookup stage
for ARP requests that will be replied by a single router. The packets
are still flooded in the L2 domain but not on any of the other patch
ports towards other routers connected to the switch. This restricted
flooding is done by using a new multicast group (MC_ARP_ND_FLOOD).

IPs that are owned by the routers and for which this fix applies are:
- IP addresses configured on the router ports.
- VIPs.
- NAT IPs.

Reported-at: https://bugzilla.redhat.com/1756945
Reported-by: Anil Venkata <vkommadi at redhat.com>
Signed-off-by: Dumitru Ceara <dceara at redhat.com>

---
v2: Move ARP broadcast domain limiting to table S_SWITCH_IN_L2_LKUP to
address localnet ports too.

View the changeset: https://github.com/dceara/ovn/compare/adcdbd9a4ead^...4caed9eae1e7

View the full build log and details: https://travis-ci.org/dceara/ovn/builds/601674976?utm_medium=notification&utm_source=email

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