As part of a QoS project we are proposing setting the DSCP value for Telnet, SSH & SNMP to CS2 as per the RFC 4594 recommendations for OAM traffic. I found this on CCO regarding the snmp stuff: http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a00801b3c85.html
This is fine when the configuration is added to Catalyst 3750 or 3560 running the latest IOS (12.2(40)SE). However I have tried a 877 router running the very latest 12.4(15)T1 Advanced IP Services IOS and the command isn't available (nor is the ip ssh dscp command). The command 'ip telnet tos' command is available on both the switches and the router.
The document I linked to states this command has been available since 12.0(26)S so I assumed this would be in 12.4(15)T1? Is this a platform thing? i.e. it will be 'bigger' routers? I know I can do this with a local policy however I would assume there is a processing overhead? Plus it makes the configuration look slighly more complex (user perception)