[76665] in North American Network Operators' Group
Re: Anycast 101
daemon@ATHENA.MIT.EDU (Joe Shen)
Mon Dec 20 08:41:33 2004
Date: Mon, 20 Dec 2004 21:41:05 +0800 (CST)
From: Joe Shen <joe_hznm@yahoo.com.sg>
To: Joe Abley <jabley@isc.org>,
Iljitsch van Beijnum <iljitsch@muada.com>
Cc: NANGO <nanog@merit.edu>, Joe Shen <joe_hznm@yahoo.com.sg>
In-Reply-To: <8D5197FD-5054-11D9-AEF9-000D93B24C7A@isc.org>
Errors-To: owner-nanog-outgoing@merit.edu
Hi,
That's what I want to discuss about. The paper gives a
very detailed explanation on anycast with OSPF_ecmp,
and what I want to know is:
is there anything not included in it but must be
considered carefully when anycast cache server farm is
to be established in MAN ?
Will there be any problem with OSPF-ECMP convergence ?
is there any request with DNS software(BIND, CNS,
powerdns etc. ) selection?
Considering such a situation, a big ISP want to set up
hierachical cache DNS service, it has several MAN
interconnected by backbone. each MAN uses a reserved
ASN. The backbone has a public ASN and connect to each
MAN with e-BGP. Should BGP multipath be considered ?
or should each MAN announce same DNS server address
block in each e-bgp session ? will there be any
possible problem in such situation?
what I do care about is, convergence speed,
reliablity, load balancing within cache server farm,
or load sharing between different cache server farm
when one of them failed, cost of administration.
Joe
>
> Also, be mindful of ECMP.
>
> http://www.isc.org/pubs/tn/isc-tn-2004-1.html
> http://www.isc.org/pubs/tn/isc-tn-2004-1.txt
>
>
> Joe
>
>
>
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