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Bandwidth management on layer 2 switch

Posted on 2010-08-24
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Last Modified: 2012-05-10
Hi Experts,

I'm looking for a layer 2 switch which is capable of bandwidth management on a per port level. Preferably up- and download limits.

What would be a good and affordable brand / type?

Regards,

Steven
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Question by:RikeR
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Expert Comment

by:Dave773
ID: 33514126
I am only familiar with Cisco Catalyst switches having this feature, and it's only on the outbound traffic (towards end-station). You can accomplish this with the 'srr-queue' command:
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_37_se/configuration/guide/swqos.html#wp1253412
I believe the Cisco 2960 is the lowest end Cisco switch that can support this feature.
Alternatively, you can set the speed of the switch port lower than the end station's / port's full capability (i.e. switch port and PC that can support 1Gbps set to 10Mbps). This is the ultra-cheap solution.
 
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by:RikeR
ID: 33515574
Hi Dave,

Thank you for the suggestion. Upload / inbound traffic should be limited as well.
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Author Comment

by:RikeR
ID: 33519542
I've looked into the srr-queue command but the bandwidth limit is only outbound traffic.

Wouldn't the srr-queue shaped or shared be better? And would this be configurable at all ports?
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by:Dave773
Dave773 earned 1000 total points
ID: 33523475
Regarding the srr-queue shaped or shared command, these are for allocating bandwidth for the egress queues, and if you are strictly just limiting bandwidth altogether, they're not necessary. You should understand what the different queues are if you're going to try this, but if you're just rate-limiting the traffic these are probably unneccesary commands.
Here is the configuration guide for the 2960 (You'd need the LAN BASE image to run QoS). If you also need to limit inbound traffic, you will only be able to do it using an IP or MAC access list, which is more end-station based rather than port based. Start reading about halfway down this page where it says "Configuring a QoS Policy ". This should guide you.
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/configuration/guide/swqos.html#wp1044742
 
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by:RikeR
ID: 33550234
Hi Dave,

Could you provide an example on how to set the down- and upload to 512/128 kbps for port1?

Regards
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