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New Member

Priority queue and interleaving for GRE tunnel interface

We use GRE tunnel over IPSEC. How can I set priority queue and interleaving on the tunnel interface for the packets what are transported inside the GRE tunnel?

If it is not possible how can I set the QoS for the VoIP which trasported over this GRE tunnel?

3 REPLIES
New Member

Re: Priority queue and interleaving for GRE tunnel interface

Use the "qos pre-classify" command to enable QoS for VPN tunnel.

Refer this doc for more details

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt1/qcfvpn.htm#1008098

New Member

Re: Priority queue and interleaving for GRE tunnel interface

Hi J

Did qos pre-classify solve your problem? i have Voip packets marked with TOS5 and use GRE over ipsec but dont know how to give them priority on the tunnel interfaces. So i would be interested in any solution you have come up with.

Colin

New Member

Re: Priority queue and interleaving for GRE tunnel interface

Mark the packets coming into the router at the LAN interafce. Add the command QOS pre-classify to the Tunnel interface and Crypto-map. At this point you can either enable Fair-queueing on the WAN interface or build a Service policy and add that to the WAN interface. Fair-queueing, by default will use the precedence bits to prioritize traffic. So the packets will already be in the correct order (prioritized) by the time they enter the tunnel. You can also use a service policy and guarantee bandwidth to certain classes. The policy also uses Fair-queue to prioritize the highest TOS bits first.

In the attached sample:

#Policy "LAN" would go on the LAN interface

interafce FAST0/0

service-policy input LAN

#Policy "QOS-128-Port" would go on the WAN interface

interface s0/0

service-policy output QOS-128-Port

*You cannot have fair-queue enabled on an inbound service policy

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