[c-nsp] DSCP or IP Precendence for CBWFQ

[Rolf Mendelsohn]

Hi Guys,

I wanted to know (or understand) whether DSCP markings and IP Prec. markings 
are interchangeable - i.e. if you mark according to DSCP, does IP Prec. based 
classes (for queuing) also apply.

Likewise if you mark for IP Prec. do DSCP based classes (for queuing) also 
apply?

If NOT, I assume it is better to use DSCP as this is the newer RFC? (which 
corresponds to IP TOS?)

Config:

ip sla monitor 1
 type udpEcho dest-ipaddr X.Y.Z.39 dest-port 4000 source-ipaddr X.Y.Z.44 
source-port 4000
 request-data-size 40
 tos 160
 timeout 1000
 threshold 1000
 tag udp_echo-wvb1-wdh2
 lives-of-history-kept 2
ip sla monitor schedule 1 life forever start-time now
ip sla monitor 2
 type jitter dest-ipaddr X.Y.Z.39 dest-port 4001 source-ipaddr X.Y.Z.44 
source-port 4001
 request-data-size 66
 tos 160
 timeout 500
 threshold 500
 tag jitter-wvb1-wdh2
ip sla monitor schedule 2 life forever start-time now

policy-map mpls-qos
  description Set a General Backbone QoS policy
 class qos1
  priority percent 20
 class qos2
  bandwidth percent 40
 class class-default
  bandwidth percent 40


gw1.wvb1.na#sh run | beg class
class-map match-any qos1
  description Critical Class
 match mpls experimental topmost 5  6  7
 match ip precedence 5  6  7
 match access-group name core-loopbacks
class-map match-any qos2
  description Priority class
 match mpls experimental topmost 1  2  3  4
 match ip precedence 1  2  3  4

cheers
/rolf