Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
New Member

Matching Voice traffic

Hi,

We have to match and prioties voice traffic on our WAN routers (887,1921,2921 and 3900 series).I have seen diffrent way to match Voice traffic as follow,

What is the best practice to match VOIP traffic on WAN routers and sent to MPLS provider.

1-

access-list 102 permit udp any any range 16384 32767

access-list 102 permit tcp any any eq 1720

class-map match-any VoIP
match access-group 102

policy-map VOIPQOS

class VoIP

priority percent 50

2-

class-map match-any VOIP

match  dscp ef

match ip precedence 5

policy-map MPLS-Link

class VOIP

  priority 10000

  set dscp af31

class class-default

  fair-queue
4 REPLIES
Hall of Fame Super Bronze

Matching Voice traffic

It's best to tag at ingress (access switch) thus going with option 2 is often the implementation done at the WAN routers.

New Member

Matching Voice traffic

Thanks,

But Does option 2 will work on all routes eg:Cisco 887 ?

Regards.

Super Bronze

Matching Voice traffic

Disclaimer

The    Author of this posting offers the information contained within this    posting without consideration and with the reader's understanding that    there's no implied or expressed suitability or fitness for any  purpose.   Information provided is for informational purposes only and  should not   be construed as rendering professional advice of any kind.  Usage of  this  posting's information is solely at reader's own risk.

Liability Disclaimer

In    no event shall Author be liable for any damages whatsoever  (including,   without limitation, damages for loss of use, data or  profit) arising  out  of the use or inability to use the posting's  information even if  Author  has been advised of the possibility of such  damage.

Posting

Believe it should, but not 100% sure.  Features do vary by platform, IOS version and feature set.

BTW, option 2 overlaps, i.e. IP Prec 5 includes IP DSCP EF.  What would be unique is DSCP CS5 and DSCP EF.

Matching Voice traffic

Hi,

I would strongly recommend the option 2.

The router needs to spend less (CPU) resourses to check the ToS value of the packet than to perform a match according to a definition of the access-list entries.

If  the router can not receive the traffic already marked by the other devices (e.g. IP phones etc) then you have to use the option 1. The option one has also the drawback of the high UDP port range for mathcing.

This is usually the method  that we select between one of the two options.

Hope that helps,

Vasilis

252
Views
4
Helpful
4
Replies
CreatePlease to create content