rate-limiting on Catalyst 3750

[marekduba]

Hi,

On catalyst I have one L3 (no switchport) interface, which is connected to ISP router (12Mbps rate-limit on ISP router).

On catalyst is configured some VLANs (cca 6) with public IPs. For example:

30.0.0.0/30 - ISP interface

30.0.0.1 - ISP default GW

30.0.0.2 - my catalyst

40.0.0.0/28 - red VLAN

40.0.0.16/28 - green VLAN

40.0.0.32/28 - blue VLAN

in each VLAN I have some servers.

And now, i need for example 5Mbps internet for red VLAN, 3Mbps internet for green VLAN and 4Mbps internet for blue VLAN.

5+4+3Mbps > 10Mbps = my aggregation :o)

how I can configure rate-limit for these VLANs?

rate-limit mustn't work on traffic between the VLANs

example:

RED VLAN to internet: 5Mbps

RED VLAN to BLUE VLAN: 100Mbps

thx for suggestions

[mheusinger]

Hi,

you could use shaped round robin queueing and assign each VLAN traffic to a separate queue on the ISP interface. SRR in shaped mode will give you an upper bandwidth limit. Be aware, that this can only be applied to output, so download rates can deviate strongly from the limits you would like to have.

Have a look at "SRR Shaping and Sharing"

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00805a6504.html#wp1200681

and at "Configuring SRR Shaped Weights on Egress Queues"

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a00805a6504.html#wp1163879

for the technical details.

Hope this helps! Please rate all posts.

Regards, Martin

[marekduba]

thx for suggestion, but i must limit both ingress and egress traffic.

my image: IP Base 12.2(25)SEE2