12-29-2008 11:17 AM - edited 03-04-2019 03:16 AM
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
12-29-2008 11:26 AM
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>
12-29-2008 11:26 AM
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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