QoS in frame relay networks

[student100]

Hello:

I'm designing a simple QoS policy for two routers connected to eachother through a frame relay network. Since I have voice, the policy only have LLQ and CB Traffic shaping as shown below. The question is: Besides policin, do frame relay networks support any kind of QoS? If so, must the service provider apply the same QoS policies i applied in my end routers (LLQ, etc)?

class-map match-any QoS-Voice

match  dscp ef

class-map match-any QoS-Sig

match  dscp cs3  af31

class-map match-any QoS-DataBase

match protocol sqlnet

match protocol sqlserver

!this policy map is nested with Shaping-768 policy map

policy-map QoS-Queuing

class QoS-Voice

  priority 300

class QoS-Sig

  bandwidth 8

class QoS-DataBase

  bandwidth 40

class class-default

  fair-queue

  random-detect

policy-map Shaping-768

class class-default

  shape average 768000 7680

  service-policy QoS-Queuing

interface Serial0/0.50 point-to-point

  bandwidth 768

ip address x.x.x.x y.y.y.y

frame-relay interface-dlci 50 CISCO

frame-relay ip tcp header-compression

frame-relay ip rtp header-compression

service-policy output Shaping-768

Thanks in advance.

David.

[Joseph W. Doherty · Accepted solution]

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Posting

Don't believe frame-relay vendors offer any QoS beyond whether a frame is marked in or out of contract (DE bit).

If you have different link bandwidth between two sites (i.e. the bandwidth to the FR cloud), you'll want to shape the higher to match lower.

Much depends on actual FR vendor's capacity, but when working with voice, you may want to shape to CIR and/or implement adaptive shaping.  (The latter might be too slow to respond to preserve VoIP quality.)

When working with VoIP, you also may want to stay away from the compression options.

[Kishore Chennupati]

David,

With Frame Relay, its the simple DE bit. The FR switches dont sort of mark/re-mark your QoS markings. They either drop or pass the frames.

In regards to the QoS policies, you need to work with the SP to match your policies. They provide different flavors of polices and you need to speak to them to suit your requirements.