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Cisco 3560 QOS Routing Question

Posted on 2011-05-02
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Last Modified: 2012-05-11
Hi Guys,

I've configured a Cisco 3560 to do some routing for my subnets. I need to add some QOS for SIP.

We have a 25/25mbit internet connection. Do you need to see my config, or can you let me know what needs to be added?

Running latest IP Routing ios.
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Question by:Layer3User
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Expert Comment

by:Soulja
ID: 35509515
My first question is will your SIP devices be marking traffic they send to the switch, and if so, do you want the switch to trust the markings they send. Second. Are you just trying to prioritize traffic at the WAN connection for SIP?
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Author Comment

by:Layer3User
ID: 35509779
Ok, first, I have a Cisco UC520 behind the Cisco 3560. I'm open for advice here. I will go along with what you suggest. I am assuming this would be a good thing to do?

Secondly, I believe so, unless there is a better way of doing it. Basically, the pipe gets full. Without QOS, we get crackling etc on the SIP lines.

Cheers.
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Author Comment

by:Layer3User
ID: 35509780
Just thinking about it, we would probably have to do this on the two vlans I have as well as the WAN, if that makes sense.
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Expert Comment

by:Soulja
ID: 35509787
Okay. I will chime in tomorrow morning.  Bedtime.
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Expert Comment

by:Soulja
ID: 35512598
Okay, what do you have connected to the UC520 and on the 3560. Also, any reason you have it behind the 3560 instead of vice versa? Not suggesting yet, just prodding.
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Expert Comment

by:Soulja
ID: 35512621
Man I wish EE had an edit button. When you say you need QOS on the vlan interfaces, are you experience degraded call quality from calls locally on the LAN, or just calls traversing your WAN connection.
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Author Comment

by:Layer3User
ID: 35516486
I'm just trying to protect myself from SIP drop outs etc.

The 3560 is the main 'router'. It's routing a bunch of subnets for me. The UC520 is behind this. Reason for this is that there are two companies in this office, so the 3560 splits them. The UC520 is my network. So the UC520 is sitting on VLAN50 on the 3560. The only other devices connected to the 3560 is another router for another network on VLAN51.
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Expert Comment

by:Soulja
ID: 35516622
Can you post the config for the switch? So both companies share the same wan connection? So Your uc520 and the other company's router default route to the 25Meg Wan connection?
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Author Comment

by:Layer3User
ID: 35516873
So the wan just has a header IP. The subnets are split.

VLAN50 has a /29 public ips
VLAN51 has a /28 public ips

Each router plugs in to a port that's configured with public IPs. If that makes sense.

I won't be able to post the config for about 3-4hrs.
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Soulja earned 2000 total points
ID: 35690608
Okay try this first on the UC520

class-map match-any SIP
match protocol sip
match protocol rtp audio

policy-map VOICE
class SIP
set dscp EF

On the interface connecting the the switch put
service-policy output VOICE

On the 3650:

mls qos

on the interface that the router is connected to:

mls qos trust


See if this works out for you.
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Author Closing Comment

by:Layer3User
ID: 35753068
Cheers mate. Fantastic help. Worked a treat.
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