On 12/3/2010 12:16 PM, Rick Martin wrote:
We are in the planning stages for a conversion to an MPLS infrastructure, we
have about 3,000 connections on this statewide network which spans 3 major
carriers territory. We expect we will wind up with one vendor at the core.
Assuming vendor A wins the core we expect we will have to provide hardware to
aggregate connections from vendor B and C's territory and pass those
connections on to the core via Ethernet.
Our expectation is that we will have 2 types of last mile connections to our
customers - Ethernet and MPPP via T1's. Of course our preference would be
Ethernet for all of the WAN links but at this time that is not possible due to
the rural nature of portions of our state. We expect perhaps 50 - 100 T1's at a
given aggregation point.
I am in need of advice on what products are available for high density
aggregation of the T1's. I am currently researching Cisco products but do not
want to limit my scope to Cisco only. I would welcome any suggestions or advice
on this.
7200s do a great job. 7200VXR might be better, so you can run NPE-G1
(for more memory) and IOS 15 for a lot of useful features on it.
PA-MC-T3s should be quite inexpensive on the used market. PA-MC-2T3
provides double the density but more than double the price, last I saw.
I'd keep individual 7200s to <=4 channelized DS3s to keep things sane,
if you can. If the T1s arrive on an OC3, I believe others have
suggested a channelized card that'll accept this; I'd limit myself to
one ChOC3 per router as well. If the T1s arrive as individual T1s, get
an Adtran MX2820 mux to deliver them to your router as DS3, or you may
want to check out RAD's line of muxes as they had one that took T1s as
RJ45 jacks (saving you the headache of wiring out the Adtran MX2820s).
At my last employer (which is where I got my T1 aggregation
experiences), our plan was to go with a Channelized OC12 card in a GSR
12008 if/when we outgrew 7200s. Never got there...
pt
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