From: Aidan Marks (amarks@cisco.com)
Date: Fri Jan 03 2003 - 18:38:57 GMT-3
It was not removed per se, just hasn't been integrated in anything else but
12.0S at this time.
Aidan
At 02:07 AM 4/01/2003, cebuano wrote:
>Aidan,
>Thanks. I should have checked previous releases since this is not an
>option in the 12.2 release I'm using. It seems that Cisco removed this
>in the image I verified it on.
>Regards.
>Elmer
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Aidan Marks
>Sent: Friday, January 03, 2003 6:33 AM
>To: cebuano
>Cc: ccielab@groupstudy.com
>Subject: Re: Missing BGP command - bgp enforce-first-as
>
>Not sure what else you need to know, but here is something - have not
>checked CCO for this, perhaps it's in the 12.0S stuff somewhere back
>around
>12.0(2.6)S when it was implemented.
>
>Aidan
>
>------------------------------
>bgp enforce-first-as
>
>To have cisco IOS enforce the first AS (in the AS_PATH) of a route
>received from an eBGP peer to be the same as the remote AS configured,
>use
>the 'bgp enforce-first-as' command. To not enforce this rule, use the
>'no' form of the command.
>
>bgp enforce-first-as
>no bgp enforce-first-as
>
>Syntax Description
>
>This command has no arguments or keywords.
>
>Default
>
>The software does not require the first AS (in the AS_PATH) of a route
>received from an eBGP peer to be the same as the remote AS configured.
>
>Command Mode
>
>Router configuration mode.
>
>Usage Guidelines
>
>This command first appeared in Cisco IOS Release 12.0S.
>
>If 'bgp enforce-first-as' is enabled then any update (received from an
>eBGP neighbor) that does not have the neighbor's configured AS at the
>beginning of the AS_PATH will be denied. When configured, the command
>applies to all the eBGP peers of the router.
>
>Example
>
>The following example shows a configuration in which all incoming
>updates
>from the eBGP peers will be examined to guarantee that the first AS (in
>the AS_PATH) is in fact the same as the configured AS for that neighbor.
>
>!
>router bgp 109
> bgp enforce-first-as
> neighbor 131.108.1.1 remote-as 65001
> neighbor 160.89.2.33 remote-as 2051
>!
>
>Related Commands
>
>show ip bgp
>
>
>At 05:04 PM 3/01/2003, cebuano wrote:
>
> >Hi all.
> >I can't find any info on this command. Any help is greatly appreciated.
> >As per CCO.
> >* If you enabled bgp enforce-first-as and the UPDATE doesn't
> >contain the AS of the neighbor as the first AS number in the
> >AS_SEQUENCE, the router sends a notification and closes the session.
> >Thanks.
> >Elmer
> >.
>.
.
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