From: Henk de Tombe (henk.de.tombe@qi.nl)
Date: Fri Feb 03 2006 - 04:28:23 GMT-3
Hi,
You can telnet to a route server and play around with it by using the regexp
feature under show ip bgp:
route-server.phx1>sh ip bgp regexp ^701_ <------------------------------
BGP table version is 46178201, local router ID is 67.17.81.28
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i3.0.0.0 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
*>i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i 67.17.64.89 600 200 0 701 703 80 i
* i6.1.0.0/16 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
route-server.phx1>sh ip bgp regexp ^701_([0-9]+)?$ <--------------------
BGP table version is 46177896, local router ID is 67.17.81.28
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i6.1.0.0/16 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
*>i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i6.2.0.0/22 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
* i 67.17.64.89 600 200 0 701 668 i
Output omitted (lot's of spacebar entries later :-)
* i 67.17.64.89 600 200 0 701 26764 i
* i 67.17.64.89 600 200 0 701 26764 i
* i 67.17.64.89 600 200 0 701 26764 i
* i12.26.86.0/24 67.17.64.89 600 200 0 701 13758 i
* i 67.17.64.89 600 200 0 701 13758 i
* i 67.17.64.89 600 200 0 701 13758 i
* i 67.17.64.89 600 200 0 701 13758 i
* i12.26.117.0/24 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
*>i 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
* i 67.17.64.89 600 200 0 701 i
Here is a list of route-servers that Brian Dennis posted some while ago,
can't find the post anymore, but here they are:
route-server.gblx.net <---- this is the one I used.
route-server.savvis.net
route-server.colt.net
route-server.opentransit.net
route-server.gt.ca
route-server.belwue.de
Regards,
Henk
-----Oorspronkelijk bericht-----
Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens Nadeem
Zahid (iszahid)
Verzonden: vrijdag 3 februari 2006 02:18
Aan: Geert Nijs; ccielab@groupstudy.com
Onderwerp: RE: BGP Filter Question
I think regexp should be: ^254(_[0-9]+)?$
-----Original Message-----
From: Geert Nijs [mailto:geert.nijs@simac.be]
Sent: Thursday, February 02, 2006 1:09 PM
To: Nadeem Zahid (iszahid); ccielab@groupstudy.com
Subject: RE: BGP Filter Question
Directly connected is just with one AS extra
so indeed
AS= 254 and any single number
If i remember correctly it should be something like:
^254_([0-9]*)$
correct me if i am wrong
Geert
CCIE #13729
-----Oorspronkelijk bericht-----
Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens Nadeem
Zahid (iszahid)
Verzonden: donderdag 2 februari 2006 20:15
Aan: ccielab@groupstudy.com
Onderwerp: BGP Filter Question
What is considered "directly connected customer" in case of BGP?
Let say R1 is receiving some prefixes from 2 nbrs:
1.1.1.1 AS path= 254 100 200 300
2.2.2.2 AS path= 254 50
Let say we wanna only allow AS 254 and its directly connected customers
- does it mean that it should
be only 1 AS behind 254 (like 1 hop)?
I see examples permitting ^254(_[0-9])*$ which is not correct IMO as it will
allow any numbers of ASs behind 254.
Nadeem
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