[j-nsp] Set 802.1p bits for DHCP packets generated from the routing-engine

[Alex D.]

Hello,

we use Dynamic subscriber management with DHCP on MX platform with JUNOS 
15.1R6.7. The MX is acting as a DHCP-relay (proxy-mode). While 
troubleshooting, i noticed, that all DHCP packets generated from the 
routing-engine are given an 802.1p value of 110 (6). RE outbound-traffic 
is assigned to a specific forwarding-class with a firewall-filter 
"re-outbound-traffic" and rewritten on egress interface based on CoS 
rewrite rules. For "management" traffic (eg. SSH, Syslog, SNMP,...), 
this works as expected, but unfortunately it does not for outgoing DHCP 
traffic.
The only way to set a speczific p-Bit (e.g.000) value for DHCP traffic 
is by configuring:
host-outbound-traffic {
     ieee-802.1 {
         default 000;
     }
}
However, this makes my firewall filter obsolete and does not give me the 
ability to set different 802.1p values (for example, depending on the 
routing instance or other criteria).

Does anybody know if there's another way to set IEEE 802.1p values 
except 'set class-of-services host-outbound-traffic' and should it 
normaly work with a firewall-filter ?

Thanks in advance.
Regards,
Alex