Traffic Shaping on Subinterfaces

Posted on 2005-04-06
Medium Priority
Last Modified: 2008-03-06
I've got the following situation:

Router M  --------  Router T
-                         _
-                       _
-                     _
-                   _
-                 _
-              _
-           _
Router K

All are attached using frame-relay subinterfaces.

Router M:

interface serial 0

interface serial 0.1 point-to-point <----toward Router K

interface serial 0.2 point-to-point <-----toward Router T

Everything configuration wise is correct concerning the frame links between the sites.  The problem is that Router T has a full T1 link, and Router M has a full T1 link.  Router K, on the other hand, is a whopping 64K link.  Obviously, you see my problem.  

I've done frame-relay traffic shaping on physical interfaces before.  So, I guess I have a couple of questions:

1) Can this be done (traffic shaping) on subinterfaces.  I've only done it using physical interfaces, and I thought that you can only apply the class under the physical interface to make it work (I could be wrong on this).

2) Regardless of if it can be done or not, what is the best course of action.  The Router K site only has two users so upgrading to a full T1 is not economically feasible, but I'm open to any suggestion.  

Question by:neowolf219
  • 2
LVL 19

Expert Comment

ID: 13717014
1) Yes you can use traffic shaping on subinterfaces.
You need to enter the command
 frame-relay traffic-shaping
at the interface level but you can use the traffic-shaping commands at the subinterface or PVC level

2) Are you currently experiencing much traffic congestion problems with the router K circuit?  If so then the traffic-shaping should benefit you

Author Comment

ID: 13717472
Hey nodisco,

Yeah, I just figured out that you can do that.  If I enable traffic shaping just going to Router K, must I also do so going to Router T.  I can't remember or not, but it seems that once I enable traffic shaping it sets the line to a default of 64k.  I'm I wrong on this.  

I just need information on how this will affect traffic flow toward Router T as well.

Appreciate the response!
LVL 19

Accepted Solution

nodisco earned 2000 total points
ID: 13717725
If you enable traffic shaping on Router T (with the T1 connection) on its PVC to Router K, you can help stop congestion before it starts.
Remember that you only have one low bandwidth link - its only on this pvc that you really need the congestion control.

When you have it setup run the command
show traffic-shape statistics
and it will show you what traffic and how much of it is affected by the shaping policy you create.

Have a look at this link for some more info

good luck

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