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Re: Time Warner Routing Issue
From: Courtney Smith <courtneysmith () comcast net>
Date: Wed, 14 Dec 2011 17:40:14 -0500


On Dec 14, 2011, at 4:09 PM, nanog-request () nanog org wrote:


Message: 3
Date: Wed, 14 Dec 2011 15:46:52 -0500
From: Brian Christopher Raaen <mailing-lists () brianraaen com>
To: nanog () nanog org
Subject: Time Warner Routing Issue
Message-ID:
      <CAEV7mMFS7pAmxwB_SLNpYEq9m3OwAL792k0hpSx5Nse2H=uHtg () mail gmail com>
Content-Type: text/plain; charset=ISO-8859-1

 They said the reason was they didn't
have an LOA (which they had gotten back in October) and the ip blocks were
not in the Level3 Radb list.  I could still see announcement to some peers
(Shaw Cable in Canada) in a few looking glasses and BGP routers.  However
my network blocks were not showing for the larger US carriers like Qwest
and AT&T.  One of their techs just called me back and said that Level3
should be advertising it, but I still do not see the routes on the AT&T
route server.  After noting that the tech said that it may take another day
for BGP to "propagate" to other peers as they update their radb tables.  In
my experience I've never seen anything where I had to wait for a route to
propagate other than standard routing table updates which usually take less
then an hour, and I'd really not expect this many problems between Tier1
and Tier2 providers.  I need to know if this matches other's experience and
wanting to know what other people were seeing with traceroutes and "show ip
bgp".  The networks in question at the following 4 /24's

68.68.176.0/24
68.68.177.0/24
68.68.178.0/24
68.68.179.0/24

the serial ip address is 72.43.84.254

Thanks for your assistance.

---
Brian Raaen
Zcorum
Network Architect


I believe the TWC tech is referring to prefix filter updates and not routing table updates.  Some of TWC's peers most 
likely use IRR based filters on their BGP sessions.  Most networks only check once a day for IRR changes and apply 
those changes to filters.  It looks TWC put in proxy route objects today for your blocks so I am guessing someone at 
TWC forgot to make the updates in advance.   Work around is for them to reach out to the peers with IRR based filters 
and request a manual update.   Sounds like that is what they are doing.

route:      68.68.176.0/24
descr:      RR-RC-Princetown Cable Company, Inc.-Albany
origin:     AS11351
notify:     ipaddreg () rr com
mnt-by:     MAINT-RR
changed:    ipaddreg () rr com 20111214
source:     RADB
route:      68.68.177.0/24
descr:      RR-RC-Princetown Cable Company, Inc.-Albany
origin:     AS11351
notify:     ipaddreg () rr com
mnt-by:     MAINT-RR
changed:    ipaddreg () rr com 20111214
source:     RADB

Run the below on 12/15 and it should return your blocks.
$ whois -h filtergen.level3.net radb::as11351 | grep 68.6
$ 




Courtney Smith
courtneysmith () comcast net

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