Chapter 5 NMT Execute Commands

Optimize Command

The following tables describe how to troubleshoot problems with Execute commands.

Symptom

IGX Links are using more bandwidth than expected for voice and data

 

calls.

Probable Causes

Voice and Data (TS and NTS) connections on the IGX are translated into fast packets. When these 24 byte packets with 20 bytes of payload are inserted into cells, the packet header is not removed, and either one or two packets are inserted into the cell. The static administration load assumes either one or two packets, based on the combine time-out value for the particular type of connection.

Solution

Combine time-outs are network global parameters that can be configured

 

under Configure/Model Settings menu. The parameters are specified in

 

the units of 0.125 usec.

 

Set the combine time outs to the largest value possible to optimize

 

bandwidth usage in the model.

 

 

Symptom

Changing the Least Cost Weights does not effect the routes of the

 

connections.

 

 

Probable

CNF file may have preferred routes, or (if it was a CET extraction) it may

Causes

have actual routes. These route fields are checked first. If there is a route in

 

 

that field, the model will use it before running AutoRoute.

 

 

Solution

Remove the actual route, or the preferred route. This can be done using F6

 

in that field for each connection. Or you can remove all routes in the

 

CONFIG/UTILITIES/CLEAR DATA menu.

 

Also check the setting of Use Preferred Routes in the EXECUTE/SET menu.

 

If this flag is Y, preferred routes will try to be used first. If it is set to N, then

 

actual routes will be used first.

 

 

Symptom

Links have an unbalanced load when routed with AutoRoute.

 

 

Probable

The site table has a bundle field that routes a specified number of

Causes

connections at the same time in a bundle. the default number of connections

 

 

per bundle is 24.

 

 

Solution

Set the bundle field in the site table to 1.

 

 

 

 

Cisco WAN Modeling Tools Guide

 

 

 

 

 

 

OL-10426-01, Rev. A0

 

 

5-7

 

 

 

 

 

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Cisco Systems OL-10426-01 manual Calls, Units of 0.125 usec, Bandwidth usage in the model, CONFIG/UTILITIES/CLEAR Data menu
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