about QOS

[giet]

I have two router(routerA &routerB) trought E1 connect. For provide a good qos to video, I use CBWFQ in E1. Define two class, give 512k to class video ,and give 700k to OA. As max-reserve-bandwidth is 75%, so availble bandwidth is left to 324k.

the problem is, cos CBWFQ just control TX data, how about RX data? does the RX data and class-default TX data will share 324k? if they share 324k , that's mean the other side's routerB's CBWFQ will not work?

[Kevin Dorrell]

This should not be a problem because your E1 will be full-duplex. That is, you will have 2048 of bandwidth in each direction independently.

You have defined your CBWFQ for one direction. If you want to engineer the traffic coming in you will have to go to the other end of the link and configure a CBWFQ there too.

But if you do not have access to the other end of the link, your options are severly curtailed. In that case, all you can do is to police the incoming traffic by class. But even this doesn't sound like a good option, 'cos if you've got video then like as not it will be UDP, which doesn't take much notice of policing.

Kevin Dorrell

Luxembourg.

[giet]

thx. I know the E1 is full-duplex, but ISP just give me 2048 of bandwidth in both direction all together. So I don't know how to set the bandwidth for each class. If the whole class bandwidth is set to 2048, I think RX will be collision.

[joyride_us]

Hi,

when you apply your policy-map to an interface, you have to configure 'input' or 'output' which defines upstream or downstream QoS.

just add your policy-map to input packets and you will have symetric bandwidth!

!

interface S0/0

! for shaping outgoing traffic

service-policy output mypolicy

! for policing the incoming

service-policy input mypolicy

.

PA : actually, if you are altking about rate cutting at the edge of your network , it is recommended to use a car function.

Good luck