On Tue, 19 Oct 1999, Steve Austin wrote:
> Most likely UUnet is filtering out the prepended as-path. You may want to
> contact them and check to see if they are allowing you to do this.
Could you explain the reasoning as to _why_ anyone would filter out a
prepended as-path?
As for the original poster, how do you know your routes disappear? Are you
using some sort of looking glass? What may be happening is that if you
prepend enough times to UUNET, the path becomes unattractive, even
internally, and all traffic starts to go over sprint. Since the UUNET
path is no longer the best path for almost any router, and only the best
path is propagated further, it may lead to a disappearance of the uunet
path from looking glasses.
/vijay
> -Steve
>
> At 11:03 AM 10/19/99 -0400, Eric J Merkel wrote:
> >
> >We currently have 3 upstream T1's. 1 with UUNET and 2 with Sprint. Right now
> >our UUNET T1(incoming traffic) is maxing out at 97% at night while our
> >Sprint T1's are at about 40% (incoming traffic).
> >
> >I was trying to prepend our AS path to our announcements goint to UUNet to
> >hopefully even things out but for some reason when doing this, all of our
> >routes thru UUNET disappeared most likely to a misconfiguration on my part
> >(I am a BGP newbie). I have since taken our the route-map statement and
> >routes thru UUNET are visible again thru the DIGEX looking glass.
> >
> >Here are my UUnet neighbor statements:
> >neighbor 137.39.2.108 remote-as 701
> >neighbor 137.39.2.108 ebgp-multihop 2
> >neighbor 137.39.2.108 update-source FastEthernet0/0
> >neighbor 137.39.2.108 next-hop-self
> >neighbor 137.39.2.108 route-map SETPATH out
> >neighbor 137.39.2.108 filter-list 10 out
> >
> >ip as-path access-list 10 permit ^$
> >
> >access-list 1 permit 0.0.0.0
> >
> >route-map SETPATH permit 10
> > match ip address 1
> > set as-path prepend 13638 13638
> >
> >I have also tried it as such:
> >route-map SETPATH permit 10
> > match as-path 10
> > set as-path prepend 13638 13638
> >
> >
> >Anyone got any ideas? BTW I am doing a clear ip bgp 137.39.2.108 after the
> >changes are complete. :)
> >
> >
> >Eric Merkel / MetaLink Technologies, Inc
> >~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
> >Email: merkel@metalink.net
> >Phone: 419-782-3472 X304
> >~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
> >
> >
>
>
Vijay Gill |The (paying) customer is always right.
wrath@cs.umbc.edu, vijay@umbc.edu | - Piercarlo Grandi
http://www.gl.umbc.edu/~vijay | Eagles may soar, but weasels don't get
These are my opinions only. | sucked into jet engines.
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