[47749] in North American Network Operators' Group
Re: BGP and aggregation
daemon@ATHENA.MIT.EDU (Scott Granados)
Sun May 12 15:59:32 2002
Date: Sun, 12 May 2002 12:58:54 -0700 (PDT)
From: Scott Granados <scott@graphidelix.net>
To: Ralph Doncaster <ralph@istop.com>
Cc: <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.21.0205111728250.2247-100000@cpu1693.adsl.bellglobal.com>
Message-ID: <Pine.LNX.4.33.0205121257280.22855-100000@penguin.graphidelix.net>
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Errors-To: owner-nanog-outgoing@merit.edu
Don't forget that if both sites use the same as even if the connection
link drops they will not be able to see each other over the upstream
provider as routers won't take the srutes from the same as. If this
isn't a problem don't worry about it. If you wish to preserve
connectivity between cities you should have a back-up link or use
different as's or gre tunnels:).
On Sat, 11 May 2002, Ralph Doncaster
wrote:
>
> I have transit in 2 cities. I have a circuit connecting the 2 cities as
> well. So far I've been using non-contiguous IPs, so there's been no
> opportunity for aggregation. Having just received my /20 from ARIN, I'm
> trying to plan my network. Lets say I split the /20 into 2 /21's, one for
> each city. I'd like to announce the aggregate /20 instead of 2 /21's, as
> long as the circuit connecting the 2 cities is working. If the circuit
> goes down I want each city to announce the local /21. Is this
> possible? (using either a Cisco router or Zebra)
>
> Ralph Doncaster
> principal, IStop.com
> div. of Doncaster Consulting Inc.
>
