sg200 vlan and qos

[mechiman5515]

Hello,

     Looking for best practice setup for this network I have three buildings networked together at layer2 have three swiches 2x sg200-24

and one sg200-18. The middle building is the one with voip phones. On the other two buildings on each end I have pbx's that mark tos bit with '5'

and voip cards in pbx's do not have vlan capabilites nor mark dscp. However in the middle building the phones have vlan marking and dscp. So have successfully made communication with setting voip cards on port 2 in the end buildings untagged on vlan 10. and middle building  tagged on vlan10 with vlan1 for downstream pc's hooked to phones (using trunks to phones) 10t 1U.

     My question is how to implement qos. The equipment does not have lldp advertising? Ideas would be apprecitated. I should mention that my idea is to use the oui's. The voip cards are marking tos bit with value '5' but the again voip cards do not support dscp. Not clear on best method for this.

Mike

[Tom Watts]

Hi Mike, the SG 200 supports LLDP med. Here's a document I wrote for the SX300

https://supportforums.cisco.com/docs/DOC-27005

It's pretty much identical to the SX200.

If you will keep the phones connected to a port and not move them, you can probably use the QoS  function of the switch, manually set the QoS configuration on the port then over ride ingress DSCP (much more aggressive, but cool) which can be found on the Quality of Service tab.

-Tom
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