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New Member

qos in layer2

hi,

i have some question about qos in layer2.

we have a router on one side which does qos with the dscp value which we are settin in the router based on acl?s.

the router is connected over a ethernet to a switch (no trunk).

how can i achive that the switch does qos based on the dscp values which the router is setting.

3 REPLIES
Cisco Employee

Re: qos in layer2

Hi Friend,

What you can do is configure the connected interface on switch as trusted interface.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12120ea2/2950scg/swqos.htm#wp1025851

HTH

Ankur

New Member

Re: qos in layer2

hi, thank you.

just one (two) questions regarding this:

if the router sets the dscp value in the ip header, who sets the 3 bits cos value in layer two even this connection is no 802.1q

connection - its a user port in the switch.

- does the switch automaticly sets cos from the layer3 dscp it receives from the router ?

thanks for answer

Cisco Employee

Re: qos in layer2

Hi Friend,

There is always a mapping available on switches from DSCP to COS which if you want you can manually change it also.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12120ea2/2950scg/swqos.htm#wp1026217

HTH

Ankur

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