qos on cisco 3560 layer 3 switch

You probably can't.

As I understand it none of the hardware forwarders

6500, 4500, 3560, 3750 ... can shape the traffic at less than the 'natural' rate of the output interface.

Oh on the other hand maybe you can. Change the ports to 10M and use whatever queuing they do. This will only work if the wireless rate is > 10Mbps real transfer rate. Otherwise back to square one.

Hello, thank you to your reply, today infact I set my port to 10Mbit, but now I must know optimezed traffic ?? now how prioritize voip traffic ??

Regards

Mat

You need to read the documents. A key thing that is not obvious is that the TOS/DSCP bits are by default UNTRUSTED and are cleared by the switch.

I have used this for something or other. What follows aer randonish QoS commands. Some stuff was working but I cant recall exactly what.

Good luck.

mls qos map cos-dscp 0 8 16 26 32 46 48 56 mls qos srr-queue input bandwidth 50 50 mls qos srr-queue input cos-map queue 1 threshold 2 1 mls qos srr-queue input cos-map queue 1 threshold 3 0 mls qos srr-queue input cos-map queue 2 threshold 1 2 mls qos srr-queue input cos-map queue 2 threshold 2 4 6 7 mls qos srr-queue input cos-map queue 2 threshold 3 3 5 mls qos srr-queue input dscp-map queue 1 threshold 2 9 10 11 12 13 14

15 mls qos srr-queue input dscp-map queue 1 threshold 3 0 1 2 3 4 5 6 7 mls qos srr-queue input dscp-map queue 1 threshold 3 32 mls qos srr-queue input dscp-map queue 2 threshold 1 16 17 18 19 20 21 22 23 mls qos srr-queue input dscp-map queue 2 threshold 2 26 33 34 35 36 37 38 39 mls qos srr-queue input dscp-map queue 2 threshold 2 48 49 50 51 52 53 54 55 mls qos srr-queue input dscp-map queue 2 threshold 2 56 57 58 59 60 61 62 63 mls qos srr-queue input dscp-map queue 2 threshold 3 24 25 27 28 29 30 31 40 mls qos srr-queue input dscp-map queue 2 threshold 3 41 42 43 44 45 46 47 mls qos srr-queue output cos-map queue 1 threshold 3 3 5 mls qos srr-queue output cos-map queue 2 threshold 3 0 1 2 4 6 7 mls qos srr-queue output dscp-map queue 1 threshold 3 24 26 46 mls qos srr-queue output dscp-map queue 2 threshold 2 9 10 11 12 13 14 15 mls qos srr-queue output dscp-map queue 2 threshold 3 0 1 2 3 4 5 6 7 mls qos srr-queue output dscp-map queue 2 threshold 3 16 17 18 19 20 21 22 23 mls qos srr-queue output dscp-map queue 2 threshold 3 25 27 28 29 30 31 32 33 mls qos srr-queue output dscp-map queue 2 threshold 3 34 35 36 37 38 39 40 41 mls qos srr-queue output dscp-map queue 2 threshold 3 42 43 44 45 47 48 49 50 mls qos srr-queue output dscp-map queue 2 threshold 3 51 52 53 54 55 56 57 58 mls qos srr-queue output dscp-map queue 2 threshold 3 59 60 61 62 63 mls qos queue-set output 1 buffers 20 20 20 40 mls qos queue-set output 2 buffers 40 40 10 10 mls qos ! class-map match-any CM-tointernet2 match input-interface FastEthernet0/2 class-map match-any CM-tointernet match access-group name ACL-tointernet class-map match-any CM-voice match any ! ! policy-map PM-tointernet2 class CM-tointernet trust dscp policy-map PM-tointernet class CM-tointernet trust dscp

interface FastEthernet0/6 description To Internet no ip address srr-queue bandwidth shape 25 60 0 0 srr-queue bandwidth limit 10 queue-set 2 priority-queue out no mdix auto

interface FastEthernet0/9 no ip address srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone no mdix auto auto qos voip cisco-phone

interface FastEthernet0/15 description IP Phone Port no ip address duplex full srr-queue bandwidth share 10 10 60 20 srr-queue bandwidth shape 10 0 0 0 mls qos trust device cisco-phone mls qos trust cos no mdix auto auto qos voip cisco-phone

ip access-list extended ACL-tointernet deny ip 172.16.155.0 0.0.0.255 172.16.155.0 0.0.0.255 permit ip any any

3560 / 3750 can do some shaping on the interface, and then use SRR limiting within that.

limiting is limited to 90% of line speed at the high end, but i havent used any other settings.

you can enable priority on Q1 on the switch, but if you do that i dont think you can limit the outbound high priority traffic on the port.

the alternative is to use the SRR Q then set Q1 to shaped traffic for the portion of link speed you want - setting Q1 to "3" means it gets up to 1/3 of the bandwidth.

so port at 100M, limit the speed, and set the 4 Qs as you need them. then use DSCP or policies on inbound traffic to put the high priority stuff into Q1.

read the qos chapter of the manual - then when you get to the end read it again, as it is fairly confusing - the examples help.

the config is fairly messy, but most of the mapping settings are global, and once you work it out just cut and paste for other switches.

then finally - test it to make sure it does what you expect.....