I have a network with several routers/switches and with an edge router at the border to the internet.
I'm interested to mark some traffic with DSCP=26.
In uplink I will ensure this by performing the DCSP marking inside the L3 switches where the hosts are directly connected, whereas in downlink inside the edge router. Also in the routers/L3 switches/L2 switches in-between edge router and hosts I need to configure them to let pass the DSCP=26.
My question is how can I get this practically done,meaning:
- what criteria is the best to use for defining the traffic that is to be marked with DSCP=26 (host IP@ only ? TCP/UDP port only? both IP@ and TCP/UDP port? etc)
- what to type in the edge router CLI (cisco 3845) to have this marking done
- what to type in the CLI of the routers/switches in-between in order to make them pass the traffic with DSCP=26 and not strip it off to DSCP=0 nor remark it.