MLP Config Question

Unanswered Question
Feb 9th, 2010

We have been configuring and working with multilink ppp for quite some time now and in a lot of different scenarios. One question i have always had is related to syntax and config choice: multilink interface configuration Vs virtual-template configuration. I know it is very common for us, as well as for many other cisco partners, to use a configuration similar to the following:

!

interface multilink number

ip address address mask

ppp multilink

ppp multilink group number

!

interface serial number1

no ip address

encapsulation ppp

ppp multilink

ppp multilink group number

!

interface serial number2

no ip address

encapsulation ppp

ppp multilink

ppp multilink group number

I have heard this referred to as "multilink bundle configuration" or "multilink interface configuration" and it functions fine on a single unit. Apparently though, at least from what I'm seeing in the config docs, this is targetted towards Distributed MLP.

On a single unit, the IOS 15.0 Dial Configuration Guide calls for the use of virtual-templates:

!

interface loopback number

ip address number mask

!

multilink virtual-template number

!

interface virtual-template number

ip unnumbered loopback number

ppp multilink

!

interface serial number1

no ip address

encapsulation ppp

ppp multilink

!

interface serial number2

no ip address

encapsulation ppp

ppp multilink

!

Either configuration works fine on a single router. I'm sure there are operational differences between the two but I've never really run into a situation where a particular features does or does not work with either one. This is not really a problem, just a curiousity. Any insight would be greatly appreciated.

Thanks.

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