[j-nsp] Juniper MX5 not forwarding dscp information.

[Gustavo Santos]

Problem solved!

It was a Cisco switch doing the rewrite.

Gustavo Santos
Analista de Redes
CCNA , MTCNA , MTCRE, MTCINE, JUNCIA-ER


2013/1/29 Gustavo Santos <gustkiller at gmail.com>

> We're just added a http/p2p caching appliance in our network. One of this
> appliance feature is to tag/mark with a dscp number the cache_hit packet
> and with that dscp information, we can set our BRAS to provide more
> bandwidth to our customers from traffic generated by the Cache engine.
>
> After doing some tests , our BRAS and even a laptop with wireshark
> directly connected to the Juniper router gets the packets from cache with
> no dscp code set.
>
> To make sure that the problem isn't with the cache engine, I did a
> firewall filter below and applyed to the interface connected to the cache.
>
> term 10 {
>     from {
>         dscp af12;
>     }
>     then {
>         count cache_out;
>         accept;
>           }
> }
> term 20 {
>     then accept;
> }
>
> And the counter worked as suposed. Counting the dscp hit packets as it
> should.
>
> But, the information isn't forwarded to another interfaces. Even testing a
> ping packet with TOS value set from the routing engine Lo0 interface to my
> laptop or the BRAS, the packets forwarded come without the dscp tag set.
>
> The Junos version os 12.1R9.
>
>
>
>
>
> Gustavo Santos
> Analista de Redes
> CCNA , MTCNA , MTCRE, MTCINE, JUNCIA-ER
>