[cisco-voip] RE: QoS over Frame

[Kris Seraphine]

Hi

 

I think you'll want something like this.  I'm not an expert on this so
hopefully, if there are mistakes or better ways to do this, someone will
post them and I'll learn something as well.

 

Create class-maps to classify voip control and rtp traffic.  You can
match a few different ways.  This simple example assumes the traffic
arrives at the edge router with the correct dscp markings.  

 

Class-map match-all rtp

Match ip dscp ef

 

Class-map match-any signal

Match ip dscp  af31

Match ip dscp cs3

 

Create a policy map to prioritize voice.  The amount of bandwidth
assigned to the priority queue depends on how many calls you want to
allow concurrently.  

Policy-map voip

Class rtp

 Priority x

Class signal

 Bandwidth 12

Class class-default

 Fair-queue

 

Create a map-class to define the pvc properties and assign the policy
created above.  Usually its recommended to shape to the cir I think.

 

Map-class frame-relay voip-class

Frame-relay cir 1000000

Frame-relay mincir 1000000

Frame-relay be 0

Frame-relay bc 10000

Service-policy output voip

 

Under the physically interface set the encap to frame and enable traffic
shaping

 

Interface sx/x

Encap frame-relay

Frame-relay traffic shaping

 

Create a sub-interface to assign the IP, pvc and apply the map-class
created above

 

Interface sx/x.1 point-to-point

Ip address x.x.x.x y.y.y.y

Frame-relay interface-dlci xx

Frame-relay class voip

Frame-relay class voip-class

 

Kris Seraphine
Senior Technology Specialist

Clifton Gunderson Technology Solutions
1111 Deming Way suite 101
Madison, WI  53717
Phone: 608.833.8638
Fax: 608.833.0194
Direct: 608.662.7640
Web: www.cliftoncpa.com <http://www.cliftoncpa.com/> 

 

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