I've built a cable modem to cable modem IPSEC GRE tunnel with 1841's on each side. Now I've been asked to implement QOS for voice between the sites.

Does anyone have a suggestion on how to go about this? Is it as simple as isolating the Voice LAN from the data LAN by VLANS on each switch on each side of the tunnel?

Any assistance would be greatly appreciated.

1841---cablemodem.......(INTERNET).........cablemodem----1841

simple setup

Thanks!

here's what I found to shape SMTP I noticed that you can shape VLAN's. If I set the voice in one VLAN on the switch, and the data in another VLAN on the switch, think I can match on each VLAN and set a policy for a percentage of the bandwidth to be used?

class-map match-any shape-smtp

match protocol smtp

policy-map shape

class shape-smtp

shape average

interface

service-policy output shape

Yes, you can assign traffic to a class based on its network or vlan by an access-list. However if your traffic is marked at the phone I would use IP precedence values or DSCP values to classify the traffic. But it sounds like you're new to QOS MCQ in the CLI. I would recommend installing SDM on your computer and using its wizard. Or maybe use autoQOS through the CLI. One more thing since you want to use QOS in a tunnel and classify the traffic by the encapsulated network you'll need to issue the command "qos pre-classify" on the tunnel interface.

class-map match-any VOICE
 match ip dscp ef
 match ip precedence 5
class-map match-any VOICE_SIGNAL
 match ip dscp cs3 
 match ip dscp af31
policy-map MY_POLICY_NAME
 class VOICE
  priority percent 30
 class VOICE_SIGNAL
  bandwidth 10
interface fa0/0
 service-policy output MY_POLICY_NAME
interface tunnel0
 qos pre-classify     ! not 100% necessary

This is very stripped down config. You'll really also need things like WRED, shaping, policing, other classes of traffic, and stuff

WOW, ok. So it should match on precedence. I don't know what phone switch they have so would this config work with any phone switch or so I have to research what to match on?

Thanks

It all depends on how the traffic is being marked. Or whether it is being marked at all.

I would sniff the traffic leaving the switch.

Your ISP shouldn't be marking the traffic. It should either be your access layer switches or the IP phones themselves.

Read the Cisco Press QOS book for CCVP or CCIP, or maybe ONT for CCNP.