Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: That pesky AS path corruption bug...

  • From: John Fraizer
  • Date: Wed May 24 00:25:58 2000


On Tue, 23 May 2000, Vijay Gill wrote:

> 
> > Since the corrupted AS-path does not include the AS that the route is
> > coming from (at least in the corruption that I saw) it seems to me that a
> > simple solution for all is to filter on AS i.e. only allow routes that
> > have the AS of your EBGP neighbor prepended to them.  I realize this does
> > not cover all cases of wacky AS corruption problems but it may fix some of
> 
> This is a hack.  We do not need more cruft added on, rather, what we need
> is correct behavior.  The correct behavior being - if you see a corrupt/ a
> malformed update from a peer, send a notify and drop the session.  Seems
> fairly simple to me. 
> 
> The above suggestion of your fails in case of route servers.
> 
> Insist on correct behavior, not on cruftery.
> 
> /vijay

Come on people.  It's VERY easy to do one of the following:

(1) NOT implement AS-path filtering on route-server connections
(2) Apply filtering on RS sessions with an as-path access-list that
includes those AS's that you will see via that RS.

Am I the only RA that notifies the peering contacts of all other RS peers
when someone new joins?  I certainly hope not.

John Fraizer
EnterZone, Inc







Discussion Communities


About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home


Merit Network, Inc.