QoS question/verification

GT-Rob

Its been a good year since I have done any MQC configs, so I just want to bounce this off some others.


I have our branch router connected to a provider router which connects to an MPLS connection back to HQ. Its a 3mb pipe over the WAN, and 100mb on the branch LAN.

so

WAN--3mb---TELCO ROUTER---100mb----BRANCH ROUTER----100mb---Internal network


what I want to do is put QoS on the Branch router, to control voice, bulk, and default traffic.


on Branch router:

class-map VOICE
match *voice acl*
class-map BULK
match *bulk acl*

policy-map OUTBOUND
class VOICE
priority percent 20
class BULK
bandwidth percent 10
class default-class
bandwidth percent 50


interface fa0/1 (outside interface)
bandwidth 3000
service-policy OUTBOUND out

(sorry for any typos this was just of the top of my head)

now on the face of this, this sound like it will do what I want, give voice 20%, guarantee non-bulk traffic gets 50%, bulk is never completely starved.

however, I feel like I need to police the traffic too, no? The bandwidth command is what the classes are getting their % from, but wouldn't the interface still try to run at 100mb? Do I need to police the interface down to 3000kbs somehow?

Otherwise the packet drop happens on the telco router, not the branch, and QoS never kicks in. no?

networker050184

What you are looking for is a nested policy map. Something like below (free hand so might be errors).

policy-map SHAPER
class class-default
shape average 3000000
service-policy OUTBOUND

This will shape everything down to 3Mbps and also create your queuing structure within that shaped bandwidth.