BGP strange logs : bgp[3455]: 8^R+^UMv^\^]1}#,^_<a ^T(null)(null)Prefix (null) received with color

[Konrad Kulikowski]

Hi

Does anybody know what this logs came from and what they mean ?

Konrad

RP/0/RSP0/CPU0:Feb 13 17:00:23.175 bgp[3455]: ^H8o^TY^Q^W^Vql"^U^_<q^Q^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.40
RP/0/RSP0/CPU0:Feb 13 17:00:23.175 bgp[3455]: ^H8o^TY^Q^W^Vql"^U^_<q^Q^T(null)(null)Prefix (null) received with color attribute from 203.3.3.40 flags 0xc00000 found color 50331648
RP/0/RSP1/CPU0:Feb 13 17:00:23.175 bgp[3455]: 8^R+^UMv^\^]1}#,^_<a ^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.40
RP/0/RSP1/CPU0:Feb 13 17:00:23.175 bgp[3455]: 8^R+^UMv^\^]1}#,^_<a ^T(null)(null)Prefix (null) received with color attribute from 203.3.3.40 flags 0xc00000 found color 50331648
RP/0/RSP0/CPU0:Feb 13 17:00:53.494 bgp[3455]: @(o^T^T'y^T^P^Wq^T^\<q^Q^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.39
RP/0/RSP0/CPU0:Feb 13 17:00:53.494 bgp[3455]: @(o^T^T'y^T^P^Wq^T^\<q^Q^T(null)(null)Prefix (null) received with color attribute from 203.3.3.39 flags 0xc00000 found color 50331648
RP/0/RSP1/CPU0:Feb 13 17:00:53.493 bgp[3455]: ^PW4^U }6^UDa5^U^\<a ^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.39
RP/0/RSP1/CPU0:Feb 13 17:00:53.493 bgp[3455]: ^PW4^U }6^UDa5^U^\<a ^T(null)(null)Prefix (null) received with color attribute from 203.3.3.39 flags 0xc00000 found color 50331648
RP/0/RSP0/CPU0:Feb 13 17:00:53.595 bgp[3455]: @(o^T^T'y^T^P^Wq^T^\<q^Q^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.40
RP/0/RSP0/CPU0:Feb 13 17:00:53.595 bgp[3455]: @(o^T^T'y^T^P^Wq^T^\<q^Q^T(null)(null)Prefix (null) received with color attribute from 203.3.3.40 flags 0xc00000 found color 50331648
RP/0/RSP1/CPU0:Feb 13 17:00:53.595 bgp[3455]: ^PW4^U }6^UDa5^U^\<a ^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.40
RP/0/RSP1/CPU0:Feb 13 17:00:53.595 bgp[3455]: ^PW4^U }6^UDa5^U^\<a ^T(null)(null)Prefix (null) received with color attribute from 203.3.3.40 flags 0xc00000 found color 50331648
RP/0/RSP0/CPU0:Feb 13 17:01:09.632 bgp[3455]: ^\9o^TX^Q^W^V@(o^T^Z<q^Q^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.39
RP/0/RSP0/CPU0:Feb 13 17:01:09.632 bgp[3455]: ^\9o^TX^Q^W^V@(o^T^Z<q^Q^T(null)(null)Prefix (null) received with color attribute from 203.3.3.39 flags 0xc00000 found color 50331648
RP/0/RSP1/CPU0:Feb 13 17:01:09.631 bgp[3455]: L^S+^ULv^\^]^PW4^U^Z<a ^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.39
RP/0/RSP0/CPU0:Feb 13 17:01:09.633 bgp[3455]: ^\9o^TX^Q^W^V@(o^T^Z<q^Q^T(null)(null)Color network (null) (path ID: ) received from 203.3.3.40

[smilstea]

This issue was just reported by a couple of other customers a few days ago, from a codewalk we can see that the issue is related to TE BGP ODN looking for color attribute in BGP external communities.

I would recommend opening a TAC case with show tech routing bgp, dumpcore running bgp, show logging, show install active summary.

Sam

[smilstea]

Follow bug has been filed:

CSCvj01353

<B>Symptom:</B>
Excessive Syslogs printed when extended community color attribute received.

<B>Conditions:</B>
Affected releases:

IOS-XR 6.3.1
IOS-XR 6.3.2
IOS-XR 6.3.3
IOS-XR 6.3.15

IOS-XR 6.4.0
IOS-XR 6.4.1
IOS-XR 6.4.2

Device configured with BGP and receiving extended communities.

<B>Workaround:</B>
Use the attribute filter:

router bgp 1
attribute-filter group example
attribute EXTENDED-COMMUNITIES discard
!
neighbor 10.10.10.1
update in filtering
attribute-filter group example

<B>Further Problem Description:</B>

Sam