Re: BGP terminology question

[NetSecGuy <netsecguy () gmail com>]

At the risk of sounding like a total moron, can anyone explain what is
happening here?

This is from RIS, specifically RRC00. Here is some sample output of
route_btoa from this file:
http://data.ris.ripe.net/rrc00/2005.11/updates.20051106.0430.gz
<snip>
BGP4MP|1131251415|STATE|193.0.0.56|3333|1|2
BGP4MP|1131251415|STATE|193.0.0.56|3333|2|4
BGP4MP|1131251415|STATE|193.0.0.56|3333|4|5
BGP4MP|1131251415|STATE|193.0.0.56|3333|5|6
BGP4MP|1131251415|A|193.0.0.56|3333|8.11.252.0/23|3333 3356
11168|IGP|193.0.0.56|0|0||NAG||
BGP4MP|1131251415|A|193.0.0.56|3333|8.11.254.0/23|3333 3356
11168|IGP|193.0.0.56|0|0||NAG||
BGP4MP|1131251415|A|193.0.0.56|3333|8.10.241.0/24|3333 1103 1273 6395 22324
22324|IGP|193.0.0.56|0|0||NAG||
BGP4MP|1131251415|A|193.0.0.56|3333|8.15.2.0/24|3333 6320 8001 6395 26049
26049 26049 26049|IGP|193.0.0.56|0|0||NAG||
</snip>

I understand AS3333 is RIS itself, is this some kind of misconfig on their
end? It seems to be announcing it's entire table every 5 minutes. This
started late Friday and ended a few hours ago.


On 11/6/05, Patrick W. Gilmore <patrick () ianai net> wrote:
> On Nov 6, 2005, at 1:05 PM, NetSecGuy wrote:
>
> > I asked this question on inet-access and it was suggested I try NANOG.
> >
> > I understand BGP flapping to be announcements followed by withdraws
> > over a short period. I am seeing a peer with a large number of
> > announcements and the normal number of withdraws. Is there a term
> > to describe what I am seeing? I'd like to understand what is
> > happening, but I've been looking for more info and can't seem to
> > find anything. I suspect I am just not using the right words to
> > search.
> >
> > If there isn't a term, why would a peer announce thousands of time
> > an hour with very few withdraws?
>
> There is a term, it's called "broken".
>
> A peer should never announce a route it has already announced unless
> that route is withdrawn. (If the session goes down or is reset, that
> counts as a withdrawal.)
>
> --
> TTFN,
> patrick