So, asumming Your guess and the fact that router is preserving DSCP
values in reflected packets one could do something like this:
Set firewall family inet filter FILTER1 term T1 from dscp XYZ;
Set firewall family inet filter FILTER1 term T1 then dscp XYZ;
Set firewall family inet filter FILTER1 term T2 then accept;
And this could set 802.1p bits to 3 most significant bits from DSCP
XYZ. Please correct me if I am wrong.
Thanks
Wojtek
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of ext Danny
Vernals
Sent: Wednesday, October 19, 2011 10:02 AM
Cc: Juniper-Nsp
Subject: Re: [j-nsp] CoS value of return traffic
On Tue, Oct 18, 2011 at 11:14 PM, Ben Dale <[email protected]> wrote:
Hi there,
We are experiencing an issue caused by exactly this behaviour
(Control traffic from the RE being automatically marked as CoS 6),
and I think the current answer regarding changing the value is no.
We are currently getting around it by looping traffic back into the
MX80 (using physical ports) in order to strip 802.1p off transit
traffic, which is an expensive hack to say the least.
I haven't tested this on an MX80 but on a MX960 (both DPC + MPC,
running 10.4 irrc) if you use an egress lo0 firewall filter with a
term with "then dscp #": 802.1p will inherit the value of the 3 most
significant bits of the DSCP you have set.
When I get some more time in the lab I'll try using lt interfaces to
do the same.
Cheers,
Ben
On 18/10/2011, at 9:40 PM, [email protected] wrote:
Hello,
Is there a possibility to set the CoS (802.1p) value of return
traffic from RE ?
I know that You can do it for, at least , DSCP using:
set class-of-service host-outbound traffic
<dscp-code-point|forwarding-class)
I couldn't say definitively but if I had to guess I'd say this would
have the same effect as setting DSCP via egress firewall filter, i.e.
802.1p would inherit MSB values.
Each time I send UDP echo probes to MX80 with different CoS values
, the router responds with the same pattern 100(binary). The best
workaround in this case would be to set CoS values according to the
particular DSCP (which is preserved in this case).
Thanks in advance for Your help!
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