Currently I'm running 11.1R1.14 . I will update You as soon as
possible with the results.
Best
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of ext Danny
Vernals
Sent: Wednesday, October 19, 2011 11:42 AM
Cc: [email protected]
Subject: Re: [j-nsp] CoS value of return traffic
2011/10/19 <[email protected]>:
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.
It's certainly worth testing although if DSCP is preserved as you say,
you would think 802.1p would inherit the values like when they are
explicitly set in my example. Let me know how you get on as if it
doesn't work, it might indicate a difference in 960 vs 80 or code
specific behavior. What JunOS version are you running by the way?
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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