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[isp-bgp] Re: Discontiguous AS
Mario,
local-as feature should be used in the opposite situation really.
Say if you have AS111 and AS222 and are planning to migrate them both to
be AS111, you might run into problems with peers hanging off AS222, which
have to change their session to be peering with 111.
If they do not do this at the same time as your migration, sessions will
go down.
So, once you made one big AS111, you can still make your peers believe
they are peering with AS222 by setting the local-as feature on neighbor-level.
Then you can co-ordinate with old 222-peers to change appropiately, if at
all:-/
Don't see any benefit/solution in using this in the situation as John
described it...
Cheers,
-Jeffrey
On Apr 2, 2003 Junoguy filled my Inbox with:
> Aside from the "allowas-in" command, something else that came to mind is
> the use of "local-as". I think the "local-as" feature would work in
> this case as well. Any thoughts from members of the list on this?
>
> Mario
>
> -----Original Message-----
> From: Brian W. [mailto:bri@...> Sent: Wednesday, April 02, 2003 6:14 PM
> To: isp-bgp@isp-bgp.com
> Subject: [isp-bgp] Re: Discontiguous AS
>
> If the upstream connections are different at each side, I'd really
> recommend
> another AS, since a national private line would cost bux..
>
> Bri
>
> ----- Original Message -----
> From: "Greenhalgh, John" <JGreenhalgh@...>
> To: <isp-bgp@isp-bgp.com>
> Sent: Wednesday, April 02, 2003 2:22 AM
> Subject: [isp-bgp] Discontiguous AS
>
>
> > Hi,
> >
> > We currently have a single AS and we are starting a new network other
> side
> > of the States. The two networks will be discontiguous. Both networks
> will
> be
> > multi-homed to Tier 1 providers and we must support BGP to customers.
> >
> > Any ideas of how we can support two discontiguous ASs but still using
> the
> > same AS number. We foresee the problem where loop avoidance mechanisms
> will
> > stop the ASs learning each other's routes.
> >
> > Ideas so far are to use statics at our network egress, or to tunnel
> sessions
> > between the two networks, both of which seem messy.
> >
> > Has anyone got any ideas how we can do this without 'bodging' it?
> >
> > John
> >
> >
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> The Definitive Event for the Wired and Wireless ISP
> Visit www.ispcon.com and register today!
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------------------------ANNOUNCEMENT-----------------------------------
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ISPCON Spring 2003 April 23-25, Baltimore, MD
=============================================
The Definitive Event for the Wired and Wireless ISP
Visit www.ispcon.com and register today!
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- [isp-bgp] Re: Discontiguous AS, Junoguy
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