I've been asked to implement qos on a router (2800), and as an absolute beginner I was hoping someone would be able to check my config please...
Basic premise is that we need to classify VoIP traffic as highest, then Telnet and RDP, then all else:
#Set ACL to capture all priority traffic
Ip access-list extended priority
Permit tcp any any eq 3389
Permit tcp any any eq 23
Deny ip any any
#Set traffic to be grouped
Class-map match-all critical
Match protocol rtp
Class-map match-all priority
Match access-group priority
Class-map match-all default
Match ip dscp default
#Classify inbound traffic
set ip dscp ef
set ip dscp af31
set ip dscp default
#Set outbound queue priority
priority percent 50
bandwidth percent 40
#Assign inbound classification
Service-policy input classify-traffic
#Assign outbound queuing
Service-policy output queue-on-dscp
My feeling is that I've got one step too many in there...do I really need to dscp classify on ingress when I'm egress queuing based on my class maps? And is this correct, or am I way off the mark?!
Any contstuctive advice would be most appreciated.
If your QoS policy map matches on protocol/acces s list etc, then you don't need to classify on ingress.
You could classify on ingress (in which case your policy map would mark traffic with a DSCP value) and then use these markings in your QoS policy if you wanted... but this is just overcomplicating it.
I'd just use the outbound policy.
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