[6bone] Newbie BGP questions

[Gert Doering]

Hi,

On Thu, Mar 06, 2003 at 10:12:28AM +0200, Hank Nussbacher wrote:
> Please excuse the newbie questions.  Looking thru the BGPv6 table I came 
> across some things that I didn't understand:
> 
> 1) This /16 doesn't appear in whois.6bone.net:
> 
> BGP routing table entry for 2002::/16, version 1154
> Paths: (1 available, best #1)
>    Not advertised to any peer
>    559 1930
>      3FFE:2000:0:41D::22F from 3FFE:2000:0:41D::22F (130.59.32.38)
>        Origin incomplete, localpref 100, valid, external, best
> 
> Is this legal?

Yes, this is legal.  This is the 6to4 prefix.  It's "anycasted", that is,
every ISP that runs a 6to4 gateway can announce the 2002::/16 prefix.

> 2) The AS paths are usually short (3-5 hops) but 2 caught my eye:
> 
> *> 3FFE:F00::/24    3FFE:2000:0:41D::22F
>                                                             0 559 9044 5424 
> 10318 5623 6939 6939 2042 3836 4618 9264 7660 22388 11537 786 1853 1853 
> 1853 1853 1853 6680 1103 2602 2200 9112 6830 12702 3549 4697 10566 13944 22 i
> 
> *> 3FFE:1F00::/24   3FFE:2000:0:41D::22F
>                                                             0 559 9044 5424 
> 10318 12199 145 4554 278 6435 17715 6939 4716 2500 4697 3320 293 6175 7580 
> 10566 15180 1251 1916 11537 22 5609 6830 1755 i
> 
> Is this normal?

No.  Well, yes and no.

It's "normal" in the sense that this happens every now and then.  We have
known IPv6 BGP withdrawal problems "somewhere out there".  I have been
observing these route ghosts since about two years or so.  Things have
improved, but every now and then we still see some.

Of course it's not normal in the sense of "it should be that way" :-)

Gert Doering
        -- NetMaster
-- 
Total number of prefixes smaller than registry allocations:  57021 (57147)

SpaceNet AG                 Mail: netmaster@Space.Net
Joseph-Dollinger-Bogen 14   Tel : +49-89-32356-0
80807 Muenchen              Fax : +49-89-32356-299