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How to limit throughput on a single Fast Ethernet port

Posted on 2008-10-24
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914 Views
Last Modified: 2012-06-27
I am looking to limit both the maximum upload and download speeds on a single FA interface on a Cisco 2950 switch. Our problem is that during peak hours, our business class cable internet connection is getting maxed out until the point that it gives up. Only solution to this point has been to wait for this to occur (internet stops working), then power cycling the modem. Already contacted the ISP on this issue and their only solution is to upgrade our service. My hope is to limit this "bottleneck" on our equipment instead of the cable modem.

Physical configuration:

Cable modem > Windows Server 2003 (NAT/DHCP/DNS) > Cisco Switch > Client.

Since the "uplink" to the Windows Server is a single FA int on the switch, is it possible to limit both upload and download throughput on this interface?

The internet connection itself it 7mbit down, 2mbit up. Was hoping to limit it to 6/1.5 and burstable to 6.5/2. If this can be done from the Windows Server side I'd be interested in this as well.

Attached is version info on the switch.

Thanks for the help!
LIP1#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA4, RELEASE SOFTWARE
(fc1)
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Wed 23-Mar-05 15:33 by yenanh
Image text-base: 0x80010000, data-base: 0x80562000
 
ROM: Bootstrap program is C2950 boot loader
 
LIP1 uptime is 5 weeks, 4 days, 4 hours, 8 minutes
System returned to ROM by power-on
System image file is "flash:/c2950-i6q4l2-mz.121-22.EA4.bin"
 
cisco WS-C2950-24 (RC32300) processor (revision R0) with 21039K bytes of memory.
 
Processor board ID FOC0922Z1KB
Last reset from system-reset
Running Standard Image
24 FastEthernet/IEEE 802.3 interface(s)
 
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:14:6A:1A:18:00
Motherboard assembly number: 73-5781-13
Power supply part number: 34-0965-01
Motherboard serial number: FOC09211T11
Power supply serial number: DAB091997XX
Model revision number: R0
Motherboard revision number: A0
Model number: WS-C2950-24
System serial number: FOC0922Z1KB
Configuration register is 0xF

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Question by:thorpez
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8 Comments
 
LVL 26

Expert Comment

by:Soulja
ID: 22799008
There is an srr queue command that could assist you in limits or shaping traffic on your switch ports, but it is in IOS version 12.2 and later.
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Author Comment

by:thorpez
ID: 22799935
Well I can go ahead and look into upgrading my IOS if you think that's necessary. We do have Smartnet for this switch.
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Author Comment

by:thorpez
ID: 22799939
Are there no other options besides srr queuing?
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LVL 26

Expert Comment

by:Soulja
ID: 22800008
Actually, this model may have the wrr queuing instead of srr queing. You may be able to do some type of policing also.
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Author Comment

by:thorpez
ID: 22800080
Any info on how to config that? I'm not looking to drill down to police specific protocols or IP addresses or anything of that nature. Just one FA interface, maximum transmission speed for download and upload.

Zach
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Soulja earned 250 total points
ID: 22800177
I think policing may be your only option. I don't think the 2950 has srr queuing.
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Author Comment

by:thorpez
ID: 22817069
Spoke with a Cisco Engineer today. Upgraded IOS, etc. Turns out this specific switch's hardware does not support QoS. The plan was to ingress policing on the uplink interface. But, it's not supported. Lame.

Maybe I'll look at some software I can run on the Windows Server.

Thanks for the help.
0
 

Author Comment

by:thorpez
ID: 22817250
What about installing DD-WRT on a Linksys router and configuring traffic control on that device? Then putting it somewhere between the modem and Cisco switch? Sounds like a cheaper solution than upgrading to a Cisco switch which supports QoS.
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