[j-nsp] Setting CoS bits on ingress frames

[Victor Sudakov]

Oh, but I was talking about 802.1p CoS, not about IP and dscp. And
the interfaces I need to classify incoming frames on are configured as
"family ethernet-switching port-mode access", not as "family inet".

The good thing is that when an EX4200 receives a frame with a
non-default CoS via a trunk port, it does not stip or alter it, but
just passes it on via the egress trunk port. Now I need to classify
frames coming via access ports.

Alexander Arseniev wrote:
> Hello,
> You can do it only on MX with JUNOS 14.2R3 and newer using new JUNOS 
> feature "policy-map", example config below:
> chassis {
>      network-services enhanced-ip;
> }
> class-of-service {
>      policy-map pm1 {
>          dscp proto-ip code-point 110001;
>      }
>      forwarding-classes {
>          queue 0 be;
>          queue 1 ef;
>          queue 2 af;
>          queue 3 nc;
>          queue 4 be1;
>          queue 5 ef1;
>          queue 6 af1;
>          queue 7 nc1;
>      }
> }
> firewall {
>      family inet {
>          filter cmap1 {
>              term t1 {
>                  from {
>                      protocol icmp;
>                  }
>                  then {
>                      policy-map pm1;
>                      count c1;
>                      accept;
>                  }
>              }
>              term t2 {
>                  then {
>                      count c2;
>                      accept;
>                  }}}}}
> 
> interfaces {
>      ge-0/0/0 {
>          unit 0 {
>              family inet {
>                  filter {
>                      input cmap1;
>                  }
>                  address 172.16.10.246/30;
>              }}}}
> This is not supported on any other Juniper product, to my knowledge.
> Thanks
> Alex
> 
> On 17/06/2015 06:58, Victor Sudakov wrote:
> > Colleagues,
> >
> > I hope I am not asking something unusual? I just want to classify
> > frames based solely on the ingress port and pass these frames out the
> > trunk ports keeping the CoS value.
> >
> > I have read about rewriting rules and classifiers, but would be really
> > grateful for a simple example.
> >
> > Victor Sudakov wrote:
> >> Colleagues,
> >>
> >> I have the following configuration on some Cisco switches, e.g.
> >>
> >> interface GigabitEthernet0/10
> >>   switchport access vlan XXX
> >>   switchport mode access
> >>   mls qos cos 6
> >>   mls qos cos override
> >> !
> >>
> >> How do I do the same on a Juniper EX4200 switch, namely force a 802.1p
> >> CoS value on all ingress frames incoming via a certain access port
> >> and keep this value when these frames leave the EX4200 switch via a
> >> trunk port?
> >>
> >> I don't need to modify Juniper queues or anything sophisticated. I
> >> just need to classify frames and pass the classified frames to the
> >> communications equipment which understands CoS bits.
> >>
> >> Thank you in advance for any input.
> >>
> >> -- 
> >> Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
> >> sip:sudakov at sibptus.tomsk.ru
> >> _______________________________________________
> >> juniper-nsp mailing list juniper-nsp at puck.nether.net
> >> https://puck.nether.net/mailman/listinfo/juniper-nsp
> 

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru