Let me know if you see anything off on the config. Still not sure why this is
not working. I was expecting to see R2 not having AS 101 in it's path.
R1
router bgp 101
no synchronization
bgp router-id 1.1.1.1
bgp log-neighbor-changes
network 33.33.33.0 mask 255.255.255.0
network 55.55.55.0 mask 255.255.255.0
network 55.55.56.0 mask 255.255.255.0
network 55.55.57.0 mask 255.255.255.0
network 55.55.58.0 mask 255.255.255.0
network 55.55.59.0 mask 255.255.255.0
network 100.100.10.0 mask 255.255.255.0
aggregate-address 55.55.0.0 255.255.192.0 summary-only
neighbor 2.2.2.2 remote-as 200
neighbor 2.2.2.2 local-as 100 no-prepend
neighbor 2.2.2.2 ebgp-multihop 255
neighbor 2.2.2.2 update-source Loopback0
neighbor 2.2.2.2 send-community
neighbor 2.2.2.2 route-map CoM out
neighbor 3.3.3.3 remote-as 300
neighbor 3.3.3.3 local-as 100 no-prepend
neighbor 3.3.3.3 ebgp-multihop 255
neighbor 3.3.3.3 update-source Loopback0
R2
router bgp 200
no synchronization
bgp log-neighbor-changes
bgp inject-map NEW exist-map NEED-UM
neighbor 1.1.1.1 remote-as 100
neighbor 1.1.1.1 ebgp-multihop 255
neighbor 1.1.1.1 update-source Loopback0
neighbor 5.5.5.5 remote-as 200
neighbor 5.5.5.5 update-source Loopback0
neighbor 5.5.5.5 send-community
neighbor 5.5.5.5 default-originate
no auto-summary
R2#sh ip bgp
BGP table version is 65, local router ID is 2.2.2.2
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
*> 33.33.33.0/24 1.1.1.1 0 0 100 101 i
*> 55.55.0.0/18 1.1.1.1 0 0 100 101 i
*> 55.55.56.0/24 1.1.1.1 0 ?
*> 100.100.10.0/24 1.1.1.1 0 0 100 101 i
From: [email protected] [mailto:[email protected]] On Behalf Of
Oluwagbenga Oyebande
Sent: Thursday, February 23, 2012 10:12 PM
To: ar
Cc: Bodnar, Edward; Steve Storniak; [email protected];
[email protected]
Subject: Re: [OSL | CCIE_RS] BGP local-as no-pepend
It actually works as Adams has proved. The problem is that people wrongly
expect it to work on adverts to the local-as peer. It works on adverts to
other bgp peers. It strips off the local-as that was prepended to routes
received from the local-as peer.
On 24 February 2012 02:53, ar <[email protected]<mailto:[email protected]>> wrote:
Hi.
This local-as no prepend feature is not working based on my experience.
What platforms are you using?
________________________________
From: "Bodnar, Edward"
<[email protected]<mailto:[email protected]>>
To: Steve Storniak <[email protected]<mailto:[email protected]>>;
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Cc: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Sent: Thursday, February 23, 2012 4:51 PM
Subject: Re: [OSL | CCIE_RS] BGP local-as no-pepend
I will grab and post my config tomorrow. Either I am not understanding this
command or I am not configuring it right. It's a fairly simple command so I
can't see the latter but I will post my config.
From: Steve Storniak [mailto:[email protected]<mailto:[email protected]>]
Sent: Thursday, February 23, 2012 7:15 PM
To: [email protected]<mailto:[email protected]>; Bodnar, Edward
Cc: [email protected]<mailto:[email protected]>
Subject: Re: [OSL | CCIE_RS] BGP local-as no-pepend
Per RFC "no-prepend" instructs the node to not add the local as to prefixes
received from other eBGP peers.
"Replace-as" removes the local as in the as-path sent to eBGP peers.
Am O wrong?
Steve
________________________________
From: Bodnar, Edward
<[email protected]<mailto:[email protected]>>;
To: Adam Booth <[email protected]<mailto:[email protected]>>;
Cc: [email protected]<mailto:[email protected]>
<[email protected]<mailto:[email protected]>>;
Subject: Re: [OSL | CCIE_RS] BGP local-as no-pepend
Sent: Thu, Feb 23, 2012 11:27:59 PM
I 100% agree. Just not sure what the local-as no-prepend does.
From: Adam Booth
[mailto:[email protected]<mailto:[email protected]><javascript:return>]
Sent: Thursday, February 23, 2012 6:11 PM
To: Bodnar, Edward
Cc:
[email protected]<mailto:[email protected]><javascript:return>
Subject: Re: [OSL | CCIE_RS] BGP local-as no-pepend
Hi Edward.
If also you include "replace-as" in the neighbor statement, AS 100 should be
hidden.
Cheers,
Adam
On Fri, Feb 24, 2012 at 6:48 AM, Bodnar, Edward
<[email protected]<mailto:[email protected]><javascript:return><mailto:[email protected]<mailto:[email protected]><javascript:return>>>
wrote:
Not sure what this command is suppose to do .
I set it and it does not filter any AS's
Router bgp 100
Neigh 2.2.2.2 Local-as 10 no-prepend
The router on the other side will still see AS 100 and AS10 in its path.
_______________________________________________
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Are you a CCNP or CCIE and looking for a job? Check out
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_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com<http://www.ipexpert.com>
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com<http://www.PlatinumPlacement.com>
http://onlinestudylist.com/mailman/listinfo/ccie_rs
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com<http://www.ipexpert.com>
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com<http://www.PlatinumPlacement.com>
http://onlinestudylist.com/mailman/listinfo/ccie_rs
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com<http://www.ipexpert.com>
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com<http://www.PlatinumPlacement.com>
http://onlinestudylist.com/mailman/listinfo/ccie_rs
--
--
Olugbenga Oyebande
MD, DAIT
234-803-302-5287
http://www.dait-ng.com<http://www.dait-ng.com/>
Cisco Networks, Network Security & Quality of Service
DAIT Linux Enterprise Network Servers, Web Portal Projects
Broadband Internet Deployment & ISP Consultancy
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
http://onlinestudylist.com/mailman/listinfo/ccie_rs
