How do you provision DLCI's ? point to point vs. multipoint

[jayo]

An incident with a service provider has led me to question my understanding of point-to-point vs. multi-point configurations on my first frame implementation. The provider's tech (whose comprehension I question) insisted that they could not provide me multiple DLCI's to the same physical connection. However, the whole point of subinterfaces is subdividing the same physical connection into separate subnets and DLCI's (in the case of point-to-point). In both p-to-p and multipoint DLCI's have only local significance but if the provider will not provision multiple DLCI's to that one physical interface how can you map them ? Oh, this was a hub and spoke, of course. Every example I see for point-to-point shows remote routers having the same DLCI number with different DLCI's mapped to the core router. Multipoint shows different DLCI's for them all......which has only served to frustrate more. How do you provision these differently with the telco ?

 

[wybnormal]

Your tech is an idiot...

One of the beauties of frame is the fact that you have single physical wire with PVCs on the inside( didnt you wonder how it worked?).. I had on a router ( not my choice) 27 PVCs spread over 27 subinterfaces. All on the same T1 circuit

It's possible and likely that in a point to point to have the remotes ALL with DLCI 16 which is the 1st number used.

DLCI 16-20-------------------------R1-DLCI16
|----------R2-DLCI16
|----------R3-DLCI16

Excuse my bad ASCII art

Normally speaking the Telcos will give you the DLCI at each end or you can request a certain DLCI number if you plan to match it to a VLAN etc.

MikeS "Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[jeter]

Mike, I was going to say just about the same as you. However my pc locked up yesterday and well it was time to go get a few beers.

The telco's do assign the dlci's to the frame relay circuit
Normally the remotes have the same dlci's lets say 16
and the host will increase 17,18,19

host remote
17 serial 0.1 point-to-point 16
18 serial 0.2 16
19 serial 0.3 16

you see the remotes can be the same. Telco MAPS them in the
frame relay cloud setup by ANS=Advance network services Jeter@LasVegas.com
J.Fisher CCNA

 

[jayo]

Thanks for the sanity check. I see that JasonC in this forum (msg titled: Frame Relay Subinterface Setup 3/2400) also mentions that ATT gave him static about giving him additional DLCI's for point-to-point telling him that it wasnt' the way to do it. I get the feeling that it is more about putting any effort into helping you than a technical issue. In fact, I'd replaced an engineer on that project who'd already gotten the contract signed before I'd reviewed it. I recommended against the point-multipoint config he'd accepted. It gave me the feeling they just didn't want to change the contract/SLA. The switch tech they kept directing me to had no concept of routing and (p-to-p or any configuration) by his own admission so now I'm at a loss as to who at the provider (not a telco that time) to go to and how to ask for it if they're lost. The management of the company I did the design for didn't understand and therefore didn't want to pursue it so I never got to resolve doing that particular config. They settled on a multipoint against my recommendations (they had a rapidly growing hub-n-spoke). Se la vi. Thanks.

 

[sunas]

Hello my friends,

I have recently taken a seat on an ISP/telecom company as a system information manager.

I am comming across with the management of a whole complex Frame relay PVCs. The network expands to a whole country (Mozambique).

Question is, if is there any software/database application that manages and tracks all the pvcs with the related dlcis from the host to the end link?

Sorry my bad english..

Thanks in advance..

Sunas

 

[jeter]

Try Cisco works 2000!!! Jeter@LasVegas.com
J.Fisher CCNA