[164913] in North American Network Operators' Group
Re: 204.17.16.0/20 Unreachable via Comcast ASN 7992; Looking for Help
daemon@ATHENA.MIT.EDU (Phil Fagan)
Fri Aug 9 14:43:17 2013
In-Reply-To: <CAGQUKcezZurngy=Pj=gUqAAaL8BpkxEjnnw0jyXgeO=oc4Hd=w@mail.gmail.com>
From: Phil Fagan <philfagan@gmail.com>
Date: Fri, 9 Aug 2013 12:42:46 -0600
To: Tony Tauber <ttauber@1-4-5.net>
Cc: Chad Reid <Chad.Reid@apollogrp.edu>, "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Interesting; instability due to reaching this table limit? Good info!
On Thu, Aug 8, 2013 at 10:39 AM, Tony Tauber <ttauber@1-4-5.net> wrote:
> It's a fair question and had nothing to do with the other network (TW
> Telecom, in this case, not TIme Warner Cable).
> Sorry for not filling in details sooner.
>
> We recently needed to adjust the scale profile on some of our Cisco ASR9k
> trident chip (80gig) Line Cards as we reached . The default profile only
> supports up to 512k routes and will notify that CEF has run out of
> DATA_TYPE_TABLE_SET space as a result. The profile change required (profi=
le
> 13) requires a reload of the chassis. please be advised. You might want =
to
> review with your local support team.
>
> The symptom involved BGP neighbor instability and unreachability of some
> destinations.
> Shutting down that particular BGP session was a temporary work-around
> until the adjustment could be made during a demand maintenance window to
> minimize disruption.
>
> Thanks,
> Tony
>
>
> On Wed, Aug 7, 2013 at 5:31 PM, Phil Fagan <philfagan@gmail.com> wrote:
>
>> BGP Noob question here; but wouldn't Time Warner not recieve a prefix if
>> it
>> wasn't reachable? Is this an artifact?
>>
>>
>> On Mon, Aug 5, 2013 at 11:32 AM, Chad Reid <Chad.Reid@apollogrp.edu>
>> wrote:
>>
>> > Thanks for the assistance everyone. This issue was resolved by shuttin=
g
>> > down a BGP peering session between Time Warner and Comcast. --Chad
>> >
>> > Chad M. Reid, Network Administrator II
>> > Work Hours: Sun. - Tue. 6AM-6PM and Wed. 6AM-3PM (MST -7)
>> > Apollo Group | IT Services =E2=94=82 IT Operations Center (ITOC)
>> > 4025 S. Riverpoint Parkway =E2=94=82 MS: AA-M002 =E2=94=82 Phoenix, AZ=
85040
>> > phone: 602.557.6746 =E2=94=82 fax: 602.557.6606 =E2=94=82 email:
>> chad.reid@apollogrp.edu
>> >
>> >
>> > -----Original Message-----
>> > From: Chad Reid
>> > Sent: Sunday, August 04, 2013 7:41 AM
>> > To: 'nanog@nanog.org'
>> > Subject: 204.17.16.0/20 Unreachable via Comcast ASN 7992; Looking for
>> > Help or Contacts
>> >
>> > Hello NANOG,
>> >
>> > A few hundred of our users that use Comcast in the South East United
>> > States (other regions aren't affected) are unable to access our
>> websites in
>> > the IP block 204.17.16.0/20. Based upon testing with the users, they'r=
e
>> > getting a destination unreachable from a Comcast backbone router in AS=
N
>> > 7922:
>> > be-16-pe03.56marietta.ga.ibone.comcast.net [68.86.83.134] reports:
>> > Destination net unreachable.
>> >
>> > We're not a customer of Comcast, nor are any of our ISPs. Because of
>> this,
>> > we can't find anyone at Comcast to look at this issue nor do we have
>> good
>> > contact info to even reach someone. Our users in the South East can op=
en
>> > tickets with Comcast technical support, but you can imagine how
>> successful
>> > they are trying to explain this to frontline support and getting
>> frontline
>> > support to understand.
>> >
>> > Is anyone from Comcast on the list that can assist or know of a contac=
t?
>> >
>> >
>> > Chad M. Reid, Network Administrator II
>> > Work Hours: Sun. - Tue. 6AM-6PM and Wed. 6AM-3PM (MST -7) Apollo Grou=
p
>> |
>> > IT Services =E2=94=82 IT Operations Center (ITOC)
>> > 4025 S. Riverpoint Parkway =E2=94=82 MS: AA-M002 =E2=94=82 Phoenix, AZ=
85040
>> > phone: 602.557.6746 =E2=94=82 fax: 602.557.6606 =E2=94=82 email:
>> chad.reid@apollogrp.edu
>> >
>> >
>> >
>> > This message is private and confidential. If you have received it in
>> > error, please notify the sender and remove it from your system.
>> >
>> >
>> >
>> >
>>
>>
>> --
>> Phil Fagan
>> Denver, CO
>> 970-480-7618
>>
>
>
--=20
Phil Fagan
Denver, CO
970-480-7618
