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New Member

weighted fair-queue

I have a 10Mbps down and 1Mbps up cable circuit with Cisco 851 router. Only QOS available is WFQ. That is fine if I can make a vonage call be stable during an ftp download. Class based Fair Queuing should work, but WFQ should at least limit ftp. I've read this only helps with slower serial links. I want to apply it to the ethernet interface connected to the cable modem. Will this work? What options for congestive discard threshold and dynamic queues do I need for a 1Mbps upload circuit?

Thanks,

fair-queue

1 ACCEPTED SOLUTION

Accepted Solutions
Super Bronze

Re: weighted fair-queue

I'm don't know the 851 QoS features, but unless there's some shaper to match your 1 Mbps up, WFQ alone won't help you if the router "sees" the interface as 10 or 100 Mbps.

4 REPLIES
Super Bronze

Re: weighted fair-queue

I'm don't know the 851 QoS features, but unless there's some shaper to match your 1 Mbps up, WFQ alone won't help you if the router "sees" the interface as 10 or 100 Mbps.

New Member

Re: weighted fair-queue

I think I understand what you are saying. Even though the Internet connection from the upstream is 1Mbps, since the interface is 100Mbps the router will do fair-queuing based on 100Mbps.

Thanks,

Super Bronze

Re: weighted fair-queue

Yes, correct. The router's WFQ will only activate when it "sees" congestion. If the interface is 100 Mbps, but if there's a downstream bandwidth bottleneck, e.g. Cable 1 Mbps, the congestion will form there where you often can't manage it. The "normal" solution is a shaper that "mimics" the downstream bottleneck such that we can prioritize traffic as we desire.

I just took a quick look at the 850's documentation. Documention is sparse when it comes to describing CBWFQ (not WFQ) features. Full CBWFQ often supports shaping, but unclear whether this feature is supported on this platform.

You might try:

policy-map somename

class-default

shape average 1000000

If that "takes", try it on your outbound facing interface, e.g.:

interface FastEthernet x

service-policy outbound somename

Also if the above "takes", there even other "better" CBWFQ statements to support voice, but more involved to configure.

New Member

Re: weighted fair-queue

Thanks,

Yes the 851 documentation does say it can do QoS, but only WFQ. Meant more for terminating a DSL connection to the router rather than a ethernet connection from a cable modem. Won't do classed based. Might just setup an ASA 5505 and be done with it.

Thanks for you help.

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