From: Matt White (mwhite23@gmail.com)
Date: Wed Mar 09 2005 - 20:49:30 GMT-3
Certainly not a real-world example, but something that has been bugging
me since I learned about LMI and FRF.
Cisco appears to want LMI via ppp/virtual template when dealing with >
768000 on a serial interface and FRF.12 on frame-relay of the same
bandwidth... I was curious to know what happens when you incorporate
both technologies and what best practice recommendations were.
Thanks for your answer Roy!
On Mar 9, 2005, at 5:59 PM, Roy Dempsey wrote:
> Hi Matt,
>
> I'll have a go :-)
>
> I'm not sure whether this is a real-world scenario or not.
>
> My opinion on this is that the two examples aren't comparing the same
> thing. If you're looking to do fragmentation over frame relay then
> option 1 is the way to go.
>
> To me, option 2 is fragmenting PPP packets which happen to be running
> over a frame-relay link. If I don't have to run PPP over your frame
> relay then I wonder would I run it just to use Link Fragmentation and
> Interleaving.
>
> Now, if you have to run PPP over Frame Relay anyway, its more
> interesting. Going only by the Cisco documentation, there seem to be
> some differences with the way they fragment the traffic. The
> frame-relay fragment command seems to be sort of a blunt instrument,
> fragmenting all traffic whereas option 2, Link Fragmentation and
> Interleaving, fragments large packets and interleaves them with
> real-time packets.
>
> In summary, I would say option 1 for fragmentation over frame relay.
> Even if you were running PPP over FR, I'm not sure why you wouldn't
> use option 1 unless option 2 is better for real-time traffic. But then
> there are other ways to ensure traffic gets priority...
>
> Anyone?
>
> Regards
> Roy
>
> On Wed, 9 Mar 2005 16:27:58 -0500, Matt White <mwhite23@gmail.com>
> wrote:
>> I posted this on another board before I found this one, didn't get an
>> answer over there...
>>
>> There appear to be two ways to do fragmentation over frame-relay:
>>
>> 1) frame-relay fragment 80 (under the map-class or interface)
>>
>> or
>>
>> 2) frame-relay interface-dlci 123 ppp virtual-template 1
>>
>> int virtual-template 1
>> ppp multilink fragment-delay 10
>> ppp multilink interleave
>>
>> Any takers on which one is better?
>>
>> Thanks.
>>
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