I would agree with joseph.

This would be best possible way to simulate.

There are few more consideration that need to be looked forward. As above you can have a 100 Mbps link and squeeze it with rate-limit command.

I think when moving to the new link it would be a router? or will it be still on a switch ?

There would be a lot of difference when the WAN link would be on the router compared to on switch. The switching and routing would cause difference in latency, convergence for the link.

The type of WAN link will it be Fiber ? Fasteth ? BundleSerial ? makes a difference ?

You may have to get all these things also into consideration and come up with a average value.

Regards,

Pravin

Thank you joseph and pravin for your assistance.

After preliminary tests, joesph's suggestion seems to have returned satisfactory results. I am aware we will need to take into account latency between switches and routers when actually running live testing, but this is more than enough for a general starting point.

What has now arisen is the request for adding a 4510 into the equation at our building, connecting to a 3750 in the datacentre.

Could someone please let me know the best way to add a throttle to a port on a 4510, or to throttle inbound and outbound traffic on a port for a 3750G?

Hi,

Thanks for keeping us informed.

The simple method i use is by rate-limit below is my example for 5 Mb.

Applied on the inetrface it works great.

rate-limit input 5242880 655000 655000 conform-action transmit exceed-action drop

rate-limit output 5242880 655000 655000 conform-action transmit exceed-action drop

5Mb

5242880 bits

655360 Bytes

http://www.cisco.com/en/US/docs/ios/12_0/qos/command/reference/qrcmdr.html#wp1017761

You also can you qos to limit the bandwidth.

Regrads,

Pravin

thanks for your help so far!

I have looked at this method but cannot seem to find the command to change this on either the 3750 or the 4510

rate-limit doesn't seem to appear when configuring the interface. It's listed a show interface subcommand, but I cannot see how to configure this.

Do I have to set CAR or create policies first?

I am sorry but i took it as a router.

This command would depend on the ios verison on the switch.

This is what you can do for switch

go to Interface Configuration Mode on the switch port, and apply the srr-queue bandwidth limit command. Here's an example:

Switch(config)#

interface FastEthernet 0/1

Switch(config-if)#

srr-queue bandwidth limit 90.

The 90 sets the outbound bandwidth limit on the port to 90 percent of the port speed. Since this is a 100-Mb port, this should limit the outbound traffic from the port to 10 Mb.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/command/reference/cli3.html#wp1947391

Regards,

Pravin