QoS Verification Question....

[lerdalt]

pretty sure I know the answer to this, but am just wanting to verify quick since I can't find an answer anywhere quickly. Here is my setup:

R1<---1gbps link--->Provider Equipment<---150mbps--->Provider Equipment<---1gbps link--->R2

Been having some traffic issues, and needing to apply some QoS, but what my question is if QoS will even do any good since I have a GigE handoff to the provider equipment, and they are then giving me a 150mbps link. I'm thinking it won't do any good, but wanted a double check.

 

[unclerico]

i would put a hierarchical QoS policy in place and have a parent policy shape your aggregate traffic to 150mbps and then implement a child QoS policy to properly divvy up that bandwidth. Does your SP give you QoS guarantees?? Are you seeing output drops right now?? What are you using for your CPE?? Is it able to forward traffic at 150mbps?? 150mbps is pretty good pipe, are you streaming Blue-Ray disks lol??

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[lerdalt]

I don't know on the SP for any QoS, another part of home work I needed to find out. Not seeing any drops right now, which I expected based on the interface. Using a 6500 switch with a SUP720. What ended up happening was desktop patches were getting pushed out without any restrictions or variable scheduling, so was filling up the link. Problem since the data center is on one side of the link, and roughly 500 workstations or so are on the other. We've taken measures to fix the patching system design, but wanting to try and protect ourselves for the future.

 

[dgrizzard]

On your link to the PE you need to issue the command

bandwidth 150000

This will set the bandwidth for the interface to 150Mbps, for purposes of the routers calculations. Whether it is cost factors for IGP, EIGRP bandwidth reservation, or QoS whatever your bandwidth is, is what the router uses for calculations. So if you left it default (1Gbps) and tried to say reserve 20% bandwidth on this link, it would think you meant 200Mbps. Set the bandwidth and any QoS you have will line up.

If you need any help with QoS design just give a shout.

 

[lerdalt]

Thanks, that's exactly what I was looking for. I just couldn't remember if the bandwidth statement would do what I need it to or not, and knew this would be faster than trying to dig through the book again.