topic Problem with send communities in Data Center (SLX)

Problem with send communities

rafaelstein — Fri, 10 Jan 2020 04:59:08 GMT

Hi,

Someone had problem with send communities between sessions after upgrade SLX-9540 to 18r.1 firmware.
I have 2 slx 9540 with sessions between both..after i upgrade 1 slx to 18.r1 firmware this not send communities to other slx(firmware 17.r2) but receive communities without problem.

Re: Problem with send communities

joergkost — Fri, 10 Jan 2020 05:16:06 GMT

Are we talking about BGP and also extended BGP communities?

Re: Problem with send communities

rafaelstein — Fri, 10 Jan 2020 05:43:42 GMT

Yes, talking about bgp...but ALL communities, extended or not.

This problem start after upgrade

Re: Problem with send communities

joergkost — Fri, 10 Jan 2020 05:55:58 GMT

Can you share some snippets from your configuration?

I do see SLXOS-38774 in SLX18r2b release notes, but this seems limited to extended.

Re: Problem with send communities

rafaelstein — Fri, 10 Jan 2020 07:12:53 GMT

configuration is very simple

scenario: SLX01 (VERSION 17r.2 ) ----------10G fiber with IP ON INTERFACE -----------SLX02 (VERSION 18r.2)

SLX01:
neighbor X.X.X.X remote-as NNNN
neighbor X.X.X.X next-hop-self
neighbor X.X.X.X. soft-reconfiguration inbound
neighbor X.X.X.X send-community both

SLX02:

neighbor Y.Y.Y.Y remote-as NNNN
neighbor Y.Y.Y.Y next-hop-self
neighbor Y.Y.Y.Y. soft-reconfiguration inbound
neighbor Y.Y.Y.Y send-community both

ON SLX02:

# show ip bgp neighbors Y.Y.Y.Y routes detail
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH
S:SUPPRESSED F:FILTERED s:STALE x:BEST-EXTERNAL
1 Prefix: 1.0.0.0/24, Rx path-id:0x00000000, Tx path-id:0x00190001, rank:0x00000002, Status: I, Age: 14h7m37s
NEXT_HOP: Y.Y.Y.Y, Metric: 0, Learned from Peer: Y.Y.Y.Y (NNNN)
LOCAL_PREF: 651, MED: 0, ORIGIN: igp, Weight: 0, GROUP_BEST: 1
AS_PATH: 13335
COMMUNITIES: NNNN:50031
AGGREGATOR: 13335(3.3.3.3)

ON SLX01:

# show ip bgp neighbors X.X.X.X routes detail vrf xxxx
Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED
E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH m:NOT-INSTALLED-MULTIPATH
S:SUPPRESSED F:FILTERED s:STALE x:BEST-EXTERNAL
1 Prefix: 45.171.128.0/24, Rx path-id:0x00000000, Tx path-id:0x00660001, rank:0x00000001, Status: BI, Age: 14h12m56s
NEXT_HOP: X.X.X.X , Metric: 0, Learned from Peer: X.X.X.X (NNNN)
LOCAL_PREF: 760, MED: none, ORIGIN: igp, Weight: 0, GROUP_BEST: 1
AS_PATH: 26434, 43434

look, after upgrade on slx01 communities not exist. even though communities are being sent they don't appear

Re: Problem with send communities

joergkost — Fri, 10 Jan 2020 21:41:21 GMT

Does the SLX -01 with 17r1 have any other peerings?

Is the SLX-02 running 18r1, 18r2a or 18r2b?

Else, I would presume, that this is could be a variation of the SLXOS-38774 bug, that is fixed in 18.r2b.