Incomplete ARP entries on L3 gw namespace

Bug #1958627 reported by Jonas Nemeiksis
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
neutron
Opinion
Medium
Unassigned

Bug Description

Setup information:

Legacy l3 router + bgp + Public Address

I see a lot unnecessary ARP request traffic to all instances in same network.

Check bgp speaker advertised routes:(fake addresses)

openstack bgp speaker list advertised routes 3e533042-729a-4782-8b8d-xxxxx
+------------------+---------------+
| Destination | Nexthop |
+------------------+---------------+
| 99.99.99.0/24 | 99.99.99.1 |
+------------------+---------------+

Check L3 gw namespace arp table:(large count of incomplete ARP entries)

ip netns exec qrouter-b524c5fc-dc91-41cb-xxxx-ceded936xxx arp -ne
Address HWtype HWaddress Flags Mask Iface
99.99.99.92 ether (incomplete). C qg-6a574a15-db
99.99.99.96 ether fa:16:3e:c6:85:28 C qr-7a4cfad1-f7
99.99.99.97 ether fa:16:3e:b4:3d:28 C qr-7a4cfad1-f7
99.99.99.90 ether fa:16:3e:83:1f:4b C qr-7a4cfad1-f7
99.99.99.91 (incomplete) qr-7a4cfad1-f7
99.99.99.98 ether (incomplete) C qr-7a4cfad1-f7
99.99.99.99 ether fa:16:3e:c6:e6:fd C qr-7a4cfad1-f7
99.99.99.94 ether fa:16:3e:dc:34:74 C qr-7a4cfad1-f7
99.99.99.95 (incomplete) qr-7a4cfad1-f7
99.99.99.92 ether fa:16:3e:51:af:ef C qr-7a4cfad1-f7
99.99.99.93 (incomplete) qr-7a4cfad1-f7
99.99.99.98 (incomplete) qr-7a4cfad1-f7
99.99.99.96 (incomplete) qr-7a4cfad1-f7
.................

Neutron adds all subnet IPs and try arping all time.

Wallaby release

Tags: l3-bgp
Revision history for this message
Oleg Bondarev (obondarev) wrote :

Seems more related to neutron-dynamic-routing project

tags: added: l3-bgp
Changed in neutron:
importance: Undecided → Medium
status: New → Opinion
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