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New Member

MPPP, LLQ & fair queue


I have two routers (3745 & 3600) which are connected via two 2M leased lines with mppp enabled.

My intention is to enable LLQ on the virtual template (to prioritise voice traffic) but I am unsure whether to enable the "fair-queue" command on the individual serial interfaces.

All the examples I can find suggest switching it off and I can only guess this is because it is simply not needed. But since I cannot find anywhere that specifically addresses this issue I am unsure.

Thanks in advance


Re: MPPP, LLQ & fair queue

Class Based Weighted Fair Queueing supported on MLPPP bundle interfaces.

Check the following document for egs.

New Member

Re: MPPP, LLQ & fair queue

Correct me if I am wrong but that document doesn't mention queuing? It describes setup instructions of MLPPP.

I am not sure you understood my question.

Do I need fair queuing on the serial interfaces given that low latency queuing is enabled on the virtual template. My current config prioritises voice traffic and applies a fair queue on the rest of the traffic at the virtual interface level. So is it needed on the serial interface?

VIP Purple

Re: MPPP, LLQ & fair queue


AFAIK, fair-queue is not supported on virtual interfaces anyway. So wether you turn it on or off, it wouldn´t work no matter what. I can only imagine that they recommend to turn it off so you don´t see it in your config and THINK it is working.



New Member

Re: MPPP, LLQ & fair queue


Actually that was my origional question, do they (cisco) recommend turning it off? I can see here <> that it has specifically been switched off but why?

I guess if it is not supported it won't matter!