Junos OS

Hi community,

I'd want to ask you about QoS configuration to classify ingress traffic, where we have a filter applied to interface:

set interfaces aeX unit 0 family inet filter input control-icmp-in

set firewall family inet filter control-icmp-in term icmp from protocol icmp
set firewall family inet filter control-icmp-in term icmp then loss-priority low
set firewall family inet filter control-icmp-in term icmp then forwarding-class EF
set firewall family inet filter control-icmp-in term icmp then accept

Moreover, this interface is also included in class-of-service configuration:

set class-of-service interfaces aeX unit 0 classifiers dscp DSCP-class

What would be the behavior? The DSCP classifier will change the mapping performed by the filter?

Thank you in advance

BR / Iván

Hi,

The two are called Behavior Aggregate [BA] and Multifield [MF] classifer in Junos:

set class-of-service interfaces aeX unit 0 classifiers dscp DSCP-class BA Classifier
set interfaces aeX unit 0 family inet filter input control-icmp-in  MF Classifier

The order in which they are processed is BA first and MF input classifier:

Both BA and MF classifier settings will be applied. BA relies on the dscp markings to classify the packet which will be overwritten by input MF in this case.

Day One Book - Deploying Basic QoS is a good resource.

Cheers,

Ashvin

Hi Ashvin,

thank you so much for your support!!!  Now the behavior is clear for me.

BR / Iván