I found this in the 3.8 manual for xmr/mx:
Configuring a PE to Allow Routes with its AS Number
BGP rejects routes that contain its own AS number within its AS_PATH attribute
to prevent routing loops. In an
MPLS/VPN hub and spoke topology this can stop legitimate routes from being
accepted. The allowas-in
command fixes this problem by allowing you to set a parameter that disables the
AS_PATH check function for
routes learned from a specified location.
To configure a PE to disable the AS_PATH check function for routes sent to it
by its BGP neighbor (a CE router
with the IP address 33.33.36.2) for a maximum limit of 3 occurrences of the
route, enter the following command at
the BGP VRF configuration level.
NetIron(config-bgp-ipv4u-vrf)# neighbor 33.33.36.2 allowas-in 3
Syntax: neighbor <IPaddress> allowas-in <asn_limit>
The <IPaddress> variable is the IP address of the neighbor CE router that the
PE router will accept routes with the
same AS number.
The asn_limit value prevents loops by limiting the number of occurrences that
the PE’s AS number will be
accepted in routes that are received from the specified router.
> Date: Mon, 27 Oct 2008 13:32:57 +0100> From: [EMAIL PROTECTED]> To: [EMAIL
> PROTECTED]; [email protected]> Subject: Re: [f-nsp] foundry
> equivalent of allowas-in> > Foundry uses allow-as in as well :)> > Ronald> >
> -----Oorspronkelijk bericht-----> Van: [EMAIL PROTECTED]> [mailto:[EMAIL
> PROTECTED] Namens Frank Louwers> Verzonden: maandag 27 oktober 2008 12:13>
> Aan: [email protected]> Onderwerp: [f-nsp] foundry equivalent of
> allowas-in> > Hi,> > Is there a Foundry equivalent of the Cisco "allowas-in"
> command on a > BGP nei? I have a new PoP to set up and the bgp transit there
> is > already delivered but the L2 link between the new pop and my main net >
> will take a few weeks to get delivered.> > In the mean time I wanted to
> allowas-in my own asn...> > Any suggestions?> > Regards,> > Frank>
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