[rbak-nsp] SEOS 6.4.1.1 and iBGP problem
Marcin Kuczera
marcin at leon.pl
Mon Sep 27 12:01:19 EDT 2010
David Freedman wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Well, I notice from this output the following:
>
>> c0 0708 0000 611f 0000 0000
>
> c0 - optional transitive attribute follows
> 07 - AGGREGATOR
> 08 - of 8 bytes
> 0000611f - from AS 24863
> 00000000 - aggregated by 0.0.0.0
>
> According to RFC4271, sec 5.1.7:
>
> AGGREGATOR is an optional transitive attribute, which MAY be included
> in updates that are formed by aggregation (see Section 9.2.2.2). A
> BGP speaker that performs route aggregation MAY add the AGGREGATOR
> attribute, which SHALL contain its own AS number and IP address. The
> IP address SHOULD be the same as the BGP Identifier of the speaker.
>
> It is possible that SEOS considers 0.0.0.0 to be an invalid BGP
> identifier and therefore an impossible aggregator
>
> For reference, this update covers the following prefixes:
>
> 41.178.0.0/24
> 41.196.4.0/22
> 41.196.8.0/22
> 41.196.12.0/22
> 41.196.16.0/22
> 41.196.24.0/22
> 41.196.36.0/23
>
>
> with AS_PATH 24724 15412 24863
>
> Since none of my SEOS boxes carry a full table can another SEOS operator
> with a full table confirm if they have these prefixes (and if so, what
> it shows as aggregator)
>
> I can tell you in Cisco IOS, I accept these prefixes.
Printouts below, it seems that all aggregators here are 0.0.0.0
6.4.1.1 has probably some accidental bug or some unfinished function is
implemented here..
Regards,
Marcin
[bgp1]RedBack_SE100#show bgp route 41.178.0.0/24
BGP ipv4 unicast routing table entry: 41.178.0.0/24, version 4979776
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
[bgp1]RedBack_SE100#show bgp route 41.196.4.0/22
BGP ipv4 unicast routing table entry: 41.196.4.0/22, version 4979779
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
[bgp1]RedBack_SE100#show bgp route 41.196.8.0/22
BGP ipv4 unicast routing table entry: 41.196.8.0/22, version 4979773
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
[bgp1]RedBack_SE100#show bgp route 41.196.12.0/22
BGP ipv4 unicast routing table entry: 41.196.12.0/22, version 4979775
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
[bgp1]RedBack_SE100#show bgp route 41.196.16.0/22
BGP ipv4 unicast routing table entry: 41.196.16.0/22, version 4979767
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
[bgp1]RedBack_SE100#show bgp route 41.196.24.0/22
BGP ipv4 unicast routing table entry: 41.196.24.0/22, version 4979769
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
[bgp1]RedBack_SE100#show bgp route 41.196.36.0/23
BGP ipv4 unicast routing table entry: 41.196.36.0/23, version 4979766
Paths: total 2, best path count 1, best peer 193.111.38.97
Advertised to non peer-group peers: 2
91.195.159.30 91.195.159.138
15744 13293 3356 15412 24863
Nexthop 212.106.159.142 (0), peer 212.106.159.142 (83.230.95.254), AS
15744
Origin IGP, localpref 200, med 0, weight 100, external
aggregator: 0.0.0.0, AS 24863
Community: 13000:9001
24724 15412 24863
Nexthop 193.111.38.97 (0), peer 193.111.38.97 (193.111.37.1), AS 24724
Origin incomplete, localpref 200, med 0, weight 100, external, best
aggregator: 0.0.0.0, AS 24863
Community: 0:15169 0:20940 8714:8714
[bgp1]RedBack_SE100#
>
> Dave
>
>
> Blake Willis wrote:
>> On Sep 27, 2010, at 2:12 PM, Marcin Kuczera wrote:
>>
>>> [bgp1]se100-test#show bgp neighbor 195.66.73.253 malform update
>>> Dump logged malformed UPDATE messages for ??? (1 total entries):
>>> Sep 27 14:09:48 Malformed UPDATE msg (nbr 195.66.73.253, context
>>> 0x40080002, 120 bytes, repeated 4221 times, reason: Invalid msg) -
>>> ffff ffff ffff ffff ffff ffff ffff ffff 0078 0200 0000 4540 0101 02c0
>>> 0708 0000 611f 0000 0000 5002 000e 0203 0000 6094 0000 3c34 0000 611f 4
>>> 003 04c1 6f26 6180 0404 0000 0000 4005 0400 0000 c8c0 080c 0000 3b41
>>> 0000 51cc 220a 220a 1829 b200 1629 c404 1629 c408 1629 c40c 1629 c410 162
>>> 9 c418 1729 c424
>> Ouch. I think it's time to open a case with the TAC. Looks like we
>> won't be testing 6.4 any time soon then...
>>
>>> Is there any possibility to ignore malformed updates instead of
>>> dropping down whole session ?
>> I don't think I've seen a knob like that from any vendor so far...
>>
>> -Blake
>> _______________________________________________
>> redback-nsp mailing list
>> redback-nsp at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/redback-nsp
>>
> 7
>
> - --
>
> David Freedman
> Group Network Engineering
>
> david.freedman at uk.clara.net
> Tel +44 (0) 20 7685 8000
>
> Claranet Group
> 21 Southampton Row
> London - WC1B 5HA - UK
> http://www.claranet.com
>
> Company Registration: 3152737 - Place of registration: England
>
> All the information contained within this electronic message from
> Claranet Ltd is covered by the disclaimer at
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