Explanation/Reference:
D: The final step is to apply the route filter to routes exported to the forwarding engine. This is shown in the following example:
routing-options {
forwarding-table {
export my-cos-forwarding;
}
}
This configuration instructs the routing process to insert routes to the forwarding engine matching my-cos- forwarding with the associated next-hop CBF rules.
A: Assigning Forwarding Class and DSCP Value for Routing Engine-Generated Traffic You can set the forwarding class and differentiated service code point (DSCP) value for traffic originating in the Routing Engine. To configure forwarding class and DSCP values that apply to Routing Engine-generated traffic only, apply an output filter to the loopback (lo.0) interface and set the appropriate forwarding class and DSCP bit configuration for various protocols.
E: The following example assigns Routing Engine sourced ping packets (using ICMP) a DSCP value of 38 and a forwarding class of af17, OSPF packets a DSCP value of 12 and a forwarding class of af11, and BGP packets (using TCP ) a DSCP value of 10 and a forwarding class of af16.
[edit class-of-service]
forwarding-classes {
class af11 queue-num 7;
class af12 queue-num 1;
class af13 queue-num 2;
class af14 queue-num 4;
class af15 queue-num 5;
class af16 queue-num 4;
class af17 queue-num 6;
class af18 queue-num 7;
}
[edit firewall filter family inet]
filter loopback-filter {
term t1 {
from {
protocol icmp; # For pings
}
then {
forwarding-class af17;
dscp 38;
}
}
term t2 {
from {
protocol ospf; # For OSPF
}
then {
forwarding-class af11;
dscp 12;
}
}
}
Etc.
References: https://www.juniper.net/techpubs/en_US/junos16.1/topics/usage-guidelines/cos-assigning-fc- dscp-to-re-pkts.html
http://www.juniper.net/techpubs/en_US/junos13.3/information-products/pathway-pages/cos/forwarding- classes.pdf (page 42)