I've assigned allowed_address_pairs to two ports belonging to different
virtual machines.
We have need to attach additional address that could be switched over in
case application failure on a VM. It could work in active-standby fashion.
While this address is assigned via neutron for both VM we starting to
seeing often BGP updates.
Those updates are visible on the gateway and for XMPP and iBGP routes in
Contrail for prefix 100.10.10.251/32.
It seems that this update occurs maily about every 90 seconds, but also it
can happen after 20 seconds.
First port is selected for most of the time. However second port can be
announced as best path for shorter time like 20 seconds.
Routes for fixed ips are stable.
Does this is known behaviour or it could be some kind of route flapping
between compute nodes ?
Is it allowed or possible for contrail to have allowed address pairs
assigned to multiple interface at the same time?
Following is short example how these allowed_address_pairs are visible in
neutron.
$ neutron port-show d196a3e5-d905-4121-ba01-d7541a7a42b5
+-----------------------+--------------------------------------------------------------------------------------+
| Field | Value
|
+-----------------------+--------------------------------------------------------------------------------------+
| admin_state_up | True
|
| allowed_address_pairs | {"ip_address": "100.10.10.251", "mac_address":
["02:d1:96:a3:e5:d9"]} |
|
| fixed_ips | {"subnet_id":
"e8c7d350-f539-422f-b8b1-0b5f83f5f16e", "ip_address": "100.10.10.12"} |
| id | d196a3e5-d905-4121-ba01-d7541a7a42b5
|
| mac_address | 02:d1:96:a3:e5:d9
|
|
+-----------------------+--------------------------------------------------------------------------------------+
$ neutron port-show 2a2b95aa-6d0b-4487-838d-80c3f8540cbd
+-----------------------+--------------------------------------------------------------------------------------+
| Field | Value
|
+-----------------------+--------------------------------------------------------------------------------------+
| admin_state_up | True
|
| allowed_address_pairs | {"ip_address": "100.10.10.251", "mac_address":
["02:2a:2b:95:aa:6d"]} |
|
| fixed_ips | {"subnet_id":
"e8c7d350-f539-422f-b8b1-0b5f83f5f16e", "ip_address": "100.10.10.13"} |
| id | 2a2b95aa-6d0b-4487-838d-80c3f8540cbd
|
| mac_address | 02:2a:2b:95:aa:6d
|
+-----------------------+--------------------------------------------------------------------------------------+
Occurences of updates:
last_modified: "2015-Aug-28 13:45:20.636004",
last_modified: "2015-Aug-28 13:47:00.799524",
last_modified: "2015-Aug-28 13:48:40.931728",
last_modified: "2015-Aug-28 13:50:24.904813",
last_modified: "2015-Aug-28 13:50:56.552607",
Changes visible at the gateway
100.10.10.251/32 *[BGP/170] 00:00:19, localpref 100, from 10.0.0.11
AS path: 64799 ?, validation-state: unverified
> via gr-0/3/0.32769, Push 16
[BGP/170] 00:00:19, localpref 100, from 10.0.0.12
AS path: 64799 ?, validation-state: unverified
> via gr-0/3/0.32769, Push 16
[BGP/170] 00:00:19, localpref 100, from 10.0.0.13
AS path: 64799 ?, validation-state: unverified
> via gr-0/3/0.32769, Push 16
100.10.10.251/32 *[BGP/170] 00:00:00, localpref 100, from 10.0.0.11
AS path: 64799 ?, validation-state: unverified
> via gr-0/3/0.32774, Push 16
[BGP/170] 00:00:00, localpref 100, from 10.0.0.12
AS path: 64799 ?, validation-state: unverified
> via gr-0/3/0.32774, Push 16
[BGP/170] 00:00:00, localpref 100, from 10.0.0.13
AS path: 64799 ?, validation-state: unverified
> via gr-0/3/0.32774, Push 16
Kind Regards
Piotr Pieprzycki
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