I have the following conf on my router:
class-map match-all NBAR_NTP match protocol ntpclass-map match-all NBAR_DNS match protocol dns
policy-map DNS_PREC class NBAR_DNS set ip precedence 4 class NBAR_NTP set ip precedence 3
The policy is applied to the interface where the server is connected:
interface FastEthernet0 no ip address load-interval 30 service-policy input DNS_PREC hold-queue 1000 in hold-queue 1000 out
But when I check the stats no one packet seems to be marked by the policy-map
887VA#show policy-map interface fastEthernet 0 FastEthernet0
Service-policy input: DNS_PREC
Class-map: NBAR_DNS (match-all) 0 packets, 0 bytes 30 second offered rate 0000 bps, drop rate 0000 bps Match: protocol dns QoS Set precedence 4 Packets marked 0
I' m not expert in QoS. What is wrong with my configuration? What I' m trying to achieve is to give priority to the DNS traffic and NTP traffic. Is it the right procedure to do it?
Mybe I have figured out by myself.
My router is cisco 887 and the 4 fastethernet are under vlan 1 interface. If I apply the policy to the interface vlan, I can see the packet get marked.
Class-map: NBAR_DNS (match-all) 981 packets, 94954 bytes 5 minute offered rate 2000 bps, drop rate 0000 bps Match: protocol dns QoS Set precedence 4 Packets marked 981
Now, one question remain: is it the right conf for what I'm looking for?
The setup is the following:
The DNS and NTP traffic is biderectional. The policy that I have applied is it enough in order to prioritize the traffic?Thanks
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