From: Joe (groupstudy@comcast.net)
Date: Tue Dec 24 2002 - 00:19:06 GMT-3
Your problem is that you are prepending between the same AS, which
doesn't work. You only update the AS when you send to another AS, so
your prepend would have to take place on R2, not R4, assuming that R5 is
not in AS 65522.
Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ouellette, Tim
Sent: Monday, December 23, 2002 8:47 PM
To: 'ccielab@groupstudy.com'
Subject: FW: AS-path prepending in confederations
Rafael,
I can't remember at this time if AS-path prepending works in
confederations. If I make the assumption that it does, the route is
learned from a RR client and therefor when reflected to another client,
the update is not modified at all.
Does this sound like the issue your having?
Tim
-----Mensaje original-----
De: Lysyuk Andrew [mailto:lysyuk@ics.ua]
Enviado el: lunes 23 de diciembre de 2002 17:09
Para: ccielab@groupstudy.com
Asunto: AS-path prepending in confederations
Hello all!
I have faced with the problem of As-prepending in confederations. Are
there any restrictions on this issue? My topology is following:
R2 --- R4
|
R5
...
I want to make 100.100.100.0/24 appeared on R2 as it traversed AS's 1000
and 1001. But it is not working. Can you help me where is my mistake?
Thanks in advance.
Andrew Lysyuk.
On R2:
interface Loopback0
ip address 150.50.2.2 255.255.255.255
router bgp 65522
no synchronization
bgp log-neighbor-changes
bgp confederation identifier 8888
bgp confederation peers 65511 65533
neighbor 150.50.17.1 remote-as 65511
neighbor 150.50.100.4 remote-as 65522
neighbor 150.50.100.4 route-reflector-client
neighbor 150.50.100.5 remote-as 65522
neighbor 150.50.100.5 route-reflector-client
neighbor 150.50.100.6 remote-as 65522
no auto-summary
On R4:
interface Loopback0
ip address 150.50.4.4 255.255.255.255
!
interface Loopback1
ip address 100.100.100.1 255.255.255.0
!
interface Loopback2
ip address 100.100.101.1 255.255.255.0
!
router bgp 65522
no synchronization
bgp log-neighbor-changes
bgp confederation identifier 8888
bgp confederation peers 65511 65533
network 100.100.100.0 mask 255.255.255.0
network 100.100.101.0 mask 255.255.255.0
neighbor 150.50.100.2 remote-as 65522
neighbor 150.50.100.2 send-community
neighbor 150.50.100.2 route-map R2 out
no auto-summary
!
!
access-list 1 permit 100.100.100.0 0.0.0.255
access-list 2 permit 100.100.101.0 0.0.0.255
!
route-map R2 permit 10
match ip address 1
set as-path prepend 1000 1001
!
route-map R2 permit 20
match ip address 2
set community local-AS
But it is not working. Prefix 100.100.100.0/24 doesn't have
R2#show ip bgp
BGP table version is 15, local router ID is 150.50.2.2
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i100.100.100.0/24 150.50.100.4 0 100 0 i
*>i100.100.101.0/24 150.50.100.4 0 100 0 i
*> 172.16.0.0/24 150.50.17.1 0 100 0 (65511) 500
i
*> 172.16.1.0/24 150.50.17.1 0 100 0 (65511) 500
i
*> 172.16.2.0/24 150.50.17.1 0 100 0 (65511) 500
i
*> 172.16.3.0/24 150.50.17.1 0 100 0 (65511) 500
i
*> 192.168.0.0 150.50.17.1 0 100 0 (65511) i
*> 192.168.0.0/22 150.50.17.1 100 0 (65511) i
*> 192.168.1.0 150.50.17.1 0 100 0 (65511) i
*> 192.168.2.0 150.50.17.1 0 100 0 (65511) i
R2#show ip bgp 100.100.100.0
BGP routing table entry for 100.100.100.0/24, version 15
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Flag: 0x208
Advertised to non peer-group peers:
150.50.17.1 150.50.100.5
Local, (Received from a RR-client)
150.50.100.4 (metric 64) from 150.50.100.4 (150.50.4.4)
Origin IGP, metric 0, localpref 100, valid, confed-internal, best
R2# .
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