From: Joe Rinehart (jjrinehart@hotmail.com)
Date: Wed Feb 08 2006 - 13:28:55 GMT-3
You need to be loaded for bear when you talk to your service provider. Not
everyone is doing an actual MPLS network in the core, some do things on the
edge but not end to end.
First, is it cell more or frame mode MPLS? There are performance
differences in each you need to be aware of. Some will just toss an ATM
network in th core where lots of network overhead chews up the bandwidth.
Packet over SONET in the core is preferable to legacy ATM in the core.
Second, is it MPLS end to end and what vendor is being used?
Third, do you have QoS enabled in the core as well as on the edge? This is
one of the show stoppers, a lot of SP's will do lots of things at the edge
and just depend on huge bandwidths in the network core and do capacity
management. If voice is going across the MPLS core this is especially
critical.
Fourth, what edge protocols are supported? Most MPLS SP's will use static
routing or BGP but there are others that support EIGRP, OSPF and RIP. My
understanding is that in a Cisco environment there are scaling issues with
the latter because each customer to provider connection (CE to PE) has to
run as a separate routing instance on the SP switch. IGP's are processor
intensive so that creates issues.
Fifth, what edge Layer 2 protocols are supported? PPP is preferred because
of lower overhead, a lot use that, ATM and frame as just edge
encapsulations, but those have greater overhead.
I lived in the presales end of the SP world for five and a half years
(vendor shall remain nameless) and these are a lot of the things that came
up in RFP's and in customer meetings.
Joe Rinehart, Consulting Systems Engineer
CCNP, CCDP, CCIE #14256
World Wide Technology, Inc.
----- Original Message -----
From: "Kevin Khan" <kkhan36@yahoo.com>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Wednesday, February 08, 2006 5:24 AM
Subject: OT - MPLS
> Hi Gurus,
> I have a hub and spoke Frame-Relay network with all
> resources at the hub. With more pressure to implement
> VOIP we are thinging MPLS.
>
> What kind of issues I should be concerned about when
> moving from Frame-Relay to MPLS? Also when talking to
> the service providers what are the important question
> they need to answer?
>
>
> Thanks for your help,
> Kevin
>
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