Ok,
Lab is done. I expected 20 minutes, it tooks 1 hour.
Important lesson about time management learnt :)
small legend:
r5 and r6 are routers in AS4
If anyone care I can send complete configs.
Przemek
r5#sh ip bgp summ
BGP router identifier 2.2.2.1, local AS number 4
BGP table version is 2, main routing table version 2
1 network entries and 1 paths using 133 bytes of memory
1 BGP path attribute entries using 60 bytes of memory
1 BGP AS-PATH entries using 24 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP activity 1/9 prefixes, 2/1 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.24.2 4 2 23 22 2 0 0 00:18:14 1
2.2.2.2 4 4 27 26 2 0 0 00:21:53 0
r5#sh ip bgp 10.0.0.0
BGP routing table entry for 10.0.0.0/8, version 2
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
2.2.2.2
2 1
1.1.24.2 from 1.1.24.2 (1.1.1.1)
Origin IGP, localpref 100, valid, external, best
r5#
telnet-server#6
[Resuming connection 6 to r6 ... ]
r6#sh ip bgp summ
BGP router identifier 2.2.2.2, local AS number 4
BGP table version is 3, main routing table version 3
1 network entries and 2 paths using 169 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
2 BGP AS-PATH entries using 48 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP activity 1/6 prefixes, 2/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
State/PfxRcd
1.1.34.3 4 3 21 20 3 0 0 00:15:20 1
2.2.2.1 4 4 27 28 3 0 0 00:22:13 1
r6#sh ip bgp 10.0.0.0
BGP routing table entry for 10.0.0.0/8, version 3
Paths: (2 available, best #2, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
1.1.34.3
3 3 1
1.1.34.3 from 1.1.34.3 (1.1.34.3)
Origin IGP, localpref 100, valid, external
2 1
1.1.24.2 from 2.2.2.1 (2.2.2.1)
Origin IGP, localpref 100, valid, internal, best
r6#
Once better route is selected in Local-RIB, the other,
previously advertised is withdrawn.
On Tue, 2002-02-05 at 21:15, W. Alan Robertson wrote:
> If you can, build your test scenario to look like this:
>
>
> [eBGP ]
> ___[AS 1]___
> | |
> | |
> [ eBGP ] [ eBGP ]
> [ AS 2 ] [ AS 3 ]
> | |
> | |
> | |
> | |
> [ BGP ] [ BGP ]
> [ AS 4 ] [ AS 4 ]
> | |
> | |
> _|___________|_
>
>
> Originate a route (say the 10.0.0.0/8 route) in AS 1, and see what
> happens in AS 4.
>
> You should see two entries for the 10/8 network in 'show ip bgp'
> output, one of which is learned via the eBGP peer, and gets installed
> in your routing table, and the second, learned via the iBGP peer,
> which does not get installed in your routing table.
>
> That is the time-honored behavior, the behavior we've all come to know
> and love since the dawn of time, etc, etc, amen. :)
>
> Now, in 12.0(20), this behavior is changed to they behavior I have
> described in this thread. I don't know when this change occurred, but
> hope to have that question answered tomorrow. Most of my other BGP
> customers are running 12.1 stuff...
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=34581&t=34581
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