GRE Tunnels for voice and data

Unanswered Question
May 21st, 2007
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Hi All,

I have a new requirement and as per the attached diagram I need to set up two gre tunnels to the same destination with two different throughput i.e. site A and Site B will have a tunnel with 768 Kbps for voice and 256 Kbps for data.

Lets say subnet x.x.x.x for voice and y.y.y.y for data.I need help in getting the best out of a 3640 running 12.0 and another 7200 vxr running 12.0(13). Please give some inputs.


Thanks in advance


Regards

subra4u



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spremkumar Mon, 05/21/2007 - 20:27
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Hi


If you are sure that you are not going to use more than 256K for voice then you can configure the same way you have posted out here and configure rate-limit on both the tunnels for the maximum allowed bandwidth so that they dont choke the whole bandwidth available over the main link..


For configuring rate-limit you can refer the below link ...


http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a0080760d90.html


regds


subra4u Wed, 05/23/2007 - 00:14
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Hi Prem,


Thanks for the Immediate Response, We are planning to have Voice for 768 Kbps but as for as the tunnel goes it will be like a data packet between our own custom developed servers.


Thanks & Regards


mheusinger Wed, 05/23/2007 - 03:49
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Hi,


There are some possibilities for voip and data over tunnels.

1) IF the packets pre-tunnel are marked (DSCP, IP precedence) then the GRE headers will also get the same markings. You can then setup a policy on the physical interface towards the internet to prioritize voip.


2) You could use "qos pre-classify" on both routers - newer IOS required though afaik.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_command_reference_chapter09186a0080087f3c.html


3) use one tunnel and a nested policy.

Why do you need two tunnels?


regards, Martin

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