Traffic Shaping on 4500X

[jschweng]

We have some ASR WAN routers which have a dedicated 400M interface to a remote site.

Servers on our Local network source the data through some firewalls via 10G interfaces, which connects to 4500X WAN switches then to the Routers on 1G links.

The sources are rate limiting the traffic but the routers are periodically dropping packets which I think is mostly due to burstiness in the traffic between as it traverses through from 10G links to 1G then to 400M. 

Can anyone point to some documentation on how to setup traffic shaping on the 4500X outbound port to our WAN routers.

I'd like to see if we could buffer and smoothe out the traffic as it exits the 4500X WAN switch 1G port to the WAN Routers.

Thank you in advance

[Reza Sharifi]

Yes, shaping is supported on the 4500X series.

Have a look at the config guide below:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/15.1/XE_330SG/configuration/guide/qos_mrg.html#wp1437716

This example shows how to configure class-level, average-rate shaping.  It limits traffic class class1 to a data transmission rate of 256 kbps:

Switch# configure terminal

Switch(config)# policy-map policy1

Switch(config-pmap)# class class1

Switch(config-pmap-c)# shape average 256000

Switch(config-pmap-c)# exit

Switch(config-pmap)# exit

Switch(config)# interface gigabitethernet1/1

Switch(config-if)# service-policy output policy1

Switch(config-if)# end

Switch#

Switch# show policy-map policy1

  Policy Map policy1

    Class class1

       shape average 256000
 

HTH