[Outages-discussion] [outages] CenturyLink peering issues?

[Charles Sprickman]

(on -discuss)

Two things:

My apologies for adding to the noise this morning, I’m pretty sure nether.net <http://nether.net/> was someone still trying to reach us via our L3 connection even after I turned it down due to what Stephen mentions here.

Second thing, someone better versed in the intricacies of BGP better than I am, can you explain a bit about how we end up in a situation where L3 continues advertising withdrawn routes for more than an hour?

Thanks,

Charles

> On Aug 30, 2020, at 7:25 AM, Stephen Flynn via Outages <outages at outages.org> wrote:
> 
> Confirmed Level3 carrier issue from the Orlando region --- possibly my other data centers as well (haven't checked them yet, been focusing on my ORL-FL outage).
> 
> Odd part --- I disconnected my Level3 circuit at the ORL-FL facility so that I could fully failover to my other carrier link.
> Level3 is still advertising my routes, even though my link and BGP session is down.
> 
> er-02.orl-fl> show interfaces descriptions | match Level3 
> xe-2/0/0        down  down LEVEL3 |
> 
> 
> er-02.orl-fl> show bgp summary | match 3356 
> 67.30.142.81           3356          0          0       0       0       27:43 Active
> 2001:1900:2100::26ad        3356          0          0       0       0       27:43 Idle
> 
> 
> BGP routing table entry for 209.208.0.0/17
> Versions:
>  Process           bRIB/RIB  SendTblVer
>  Speaker           86180864    86180864
> Last Modified: May 16 05:47:52.095 for 15w1d
> Paths: (25 available, best #25)
>  Advertised IPv4 Unicast paths to update-groups (with more than one peer):
>    0.1 0.2 0.8 0.9 0.10 
>  Path #1: Received by speaker 0
>  Not advertised to any peer
>  3356 6364
>    129.250.8.174 (metric 9340) from 129.250.0.2 (129.250.0.2)
>      Origin IGP, metric 4294967294, localpref 100, valid, confed-internal
>      Received Path ID 0, Local Path ID 0, version 0
>      Community: 2914:390 2914:1003 2914:2000 2914:3000 65504:3356
>  Path #2: Received by speaker 0
>  Not advertised to any peer
>  3356 6364
>    129.250.9.50 (metric 24142) from 129.250.0.6 (129.250.0.6)
>      Origin IGP, metric 4294967294, localpref 100, valid, confed-internal
>      Received Path ID 0, Local Path ID 0, version 0
>      Community: 2914:390 2914:1214 2914:2213 2914:3200 65504:3356
>  Path #3: Received by speaker 0
>  Not advertised to any peer
>  174 6364
>    130.117.15.89 (metric 24174) from 129.250.0.13 (129.250.0.13)
>      Origin IGP, metric 4294967294, localpref 100, valid, confed-internal
>      Received Path ID 0, Local Path ID 0, version 0
>      Community: 2914:390 2914:1204 2914:2205 2914:3200 65504:174
>  Path #4: Received by speaker 0
> 
> 
> 
> Regards,
> 
> Stephen Flynn
> Atlantic.Net
> Direct: (321) 206-1390
> sflynn at staff.atlantic.net
> www.atlantic.net
> 
> 
> -----Original Message-----
> From: Outages <outages-bounces at outages.org> On Behalf Of randal k via Outages
> Sent: Sunday, August 30, 2020 7:10 AM
> To: outages at outages.org
> Subject: [outages] CenturyLink peering issues?
> 
> 
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> We have been seeing serious issues with Level3/CenturyLink services over the past hour or so. Everything on-net seems OK, but transit traffic looks to have problems. Thoughts?
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