yahoo-eng-team team mailing list archive

[Oleg Bondarev <1958627@xxxxxxxxxxxxxxxxxx>]

Seems more related to neutron-dynamic-routing project

** Tags added: l3-bgp

** Changed in: neutron
   Importance: Undecided => Medium

** Changed in: neutron
       Status: New => Opinion

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https://bugs.launchpad.net/bugs/1958627

Title:
  Incomplete ARP entries on L3 gw namespace

Status in neutron:
  Opinion

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

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