At 2:53 PM -0400 5/10/02, Chris Headings wrote:
>Thanks!!!
>
>We are an ISP in So. Cal. We are gearing up to open other offices in
>bewteen Arizona and Ca...
>
>We are trying to decide what would be the best way of intergrating our ISP
>network...like...
>
>Should we just continue to use our one ASN and have all traffic come back to
>the Global NOC, or should get new ASN's for each location??
Well, at least at the continental level, you won't be able to get
more than one registered AS. You can certainly use private ASNs,
which don't even need to be in confederations. The Cisco
remove-private-AS feature lets you play lots of games with multiple
private AS but without confederations.
You can even use the same private ASN for different customers. See RFC 2270.
Essentially, you want multiple AS if you have different routing
policies in different areas. Most ISPs don't, although some of the
early ones use lots of registered AS since they got them at a time
when they were readily available.
It's really hard to say without knowing your topology and policy.
>?
>
>Should we be using IS-IS, IBGP/EBGP, OSPF as the protocol to link all remote
>locations???
You will need BGP _and_ an IGP. You MAY want MPLS as well,
especially if you are offering lots of VPNs of a kind where it's
appropriate.
The choice between ISIS and OSPF is a tossup. Some of the arguments
for each one:
ISIS OSPF
---- ----
More scalable in flat networks More aggregation capability
Lots of undocumented practice Well known
Probably better supported for TE features beginning to come in
traffic engineering
Until you use some new and subtle Wide range of choices of area
methods such as L1L2 leaking, structure allowing a range of
can be very inflexible for alternatives from best-exit
best-exit routing to closest-exit
Lower processor utilization Higher processor utilization.
Designer preference. Designer Designer preference. Designer
is a Radia Perlman groupie. is a John Moy groupie
>
>Obviously cost in an issue, but throwing cost out the door, what is the
>ideal way of linking ALL offices, using a good level of redundancy and great
>preformance...
I'm afraid the answer is "it depends".
--
"What Problem are you trying to solve?"
***send Cisco questions to the list, so all can benefit -- not
directly to me***
********************************************************************************
Howard C. Berkowitz [EMAIL PROTECTED]
Chief Technology Officer, GettLab/Gett Communications http://www.gettlabs.com
Technical Director, CertificationZone.com http://www.certificationzone.com
"retired" Certified Cisco Systems Instructor (CID) #93005
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