[cisco-voip] GRE tunnel with QoS

[Nick Griffin]

I've done this with ipsec/gre tunnels, and verified the TOS values are kept
intact on the GRE packet. You can always use an ACL on the remote location
to match on your DSCP value when it comes in from the service provider
cloud, the catch is at that point the traffic will be GRE, so you would do
something like:

ip access-list extended TEST
permit grep any any dscp ef
permit ip any any <---- Don't forget about the ip any any

interface serx/y
ip access-group TEST in

if you are sending traffic out the cloud with DSCP value 46, they should
arrive at the remote location with the DSCP value of 46 and that type acl
entry should increment. If not they're stripping it, or your not sending it.


Don't forget about TCP MSS and IP MTU.

HTH,

NIck Griffin


On Fri, Jun 5, 2009 at 11:57 AM, Eric Pedersen <eric.pedersen at sait.ca>wrote:

>  Thanks for the links Wes; I was unable to find information on what the
> default behaviour is.  I like it when configuration tasks are “None”.
>
>
>
> I have not tested it yet – I will be doing that next week.
>
>
>
> *From:* Wes Sisk [mailto:wsisk at cisco.com]
> *Sent:* June 4, 2009 21:09
> *To:* Eric Pedersen
> *Cc:* cisco-voip at puck.nether.net
> *Subject:* Re: [cisco-voip] GRE tunnel with QoS
>
>
>
> I've not tested it but:
>
>
> http://www.cisco.com/en/US/docs/ios/11_3/feature/guide/greqos.html
> Configuration Tasks
>  None; this feature occurs by default.
>
>
> http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a008017405e.shtml
>
> Do you have indication that it is not working?
>
> /Wes
>
> On Thursday, June 04, 2009 8:54:37 PM, Eric Pedersen
> <eric.pedersen at sait.ca> <eric.pedersen at sait.ca> wrote:
>
>  I want to set up a GRE tunnel to a remote site over our provider’s MPLS
> VPN service.  They classify our voice traffic based on dscp. Does someone
> have an example of how to set this up so that when packets are tunneled,
> their DSCP values are copied to the GRE packet headers?
>
>
>
> Thanks,
>
> Eric
>
>
>
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