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QOS On Cisco Integrated Services Routers

bortiquai
Beginner
Beginner

I have two sites connected by Frame-Relay. At Site (A) is a Cisco 2801 with IOS 12.3, and at Site (B) is a Cisco 1841 with IOS 12.4. Each site uses a VoIP solution NOT Cisco. The connection is a full T1.

I need to prioritize this voice traffic over the frame.

In the past, with other routers, i have accomplished this by prioritizing the TCP and UDP Ports the voice traffic opperates on (Much like an access list).

Also, in the past on cisco, i have used the QOS/COS map (this VoIP Uses DSCP 46).

On this situation, the 1841 with IOS 12.4 does not have the mls commands, and on the 2801 with IOS 12.3, it does not have all the mls commands that are in 12.4

Could you recomend a configuration to prioritize the voice traffic over this connection.

Thank you

matt

2 Replies 2

andrew.prince
Advocate
Advocate

Matt,

The mls commands are not available as they are not multilayer switches, they are routers.

You still need to configure:-

1) Define the traffic

2) Create your class-maps

3) Create your policy-maps

4) Apply the policy to the interface

Read the below link - the Cisco QoS SRND guide:-

http://www.cisco.com/univercd/cc/td/doc/solution/esm/qossrnd.pdf

HTH>

Collin Clark
Advisor
Advisor

If your phones tag DSCP and the switches honor them, then you don't need CoS to DSCP mapping. Here is a config example.

class-map match-all VOICE

match ip dscp ef

class-map match-any CALL-SIGNALING

match ip dscp cs3

policy-map WAN-EDGE

class VOICE

priority percent 33

class CALL-SIGNALING

bandwidth percent 5

class class-default

fair-queue

Hope that helps.

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