stig.johansen at ementor
Jul 12, 2008, 5:32 AM
Post #2 of 2
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Hi there,
Short answer: you aren't missing anything. :)
Traditionally the 6500/7600-platform has been rather poor in the
QoS-department, presumably because of the extended use of
hardware-switching. I would think this is just one more of the "wouldn't
it be great if.." features we want to see, but may or may not see
supported in the future..
The 6500/7600-platform does support explicit null LSP's, but the problem
is using this information at the egress PE as you yourself noted. The
"set qos-group" is regretfully not supported at ingress MPLS-interfaces
as far as I can see as well.
I really don't have any viable alternatives for you at this point as I
haven't implemented any of this myself outside a small labtest I did
just now.
Can't you let the customer-set DSCP manage the QoS on the egress to the
CE? I understand you see this as a benefit to be able to control as the
SP, but shouldn't the customer ideally have a say in this? :)
Best regards,
Stig Meireles Johansen
-----Original Message-----
From: cisco-nsp-bounces[at]puck.nether.net
[mailto:cisco-nsp-bounces[at]puck.nether.net] On Behalf Of J C
Sent: 7. juli 2008 06:52
To: cisco-nsp[at]puck.nether.net
Subject: [c-nsp] 7600 MPLS QoS
I've been going through all the documentation regarding MPLS and
configuring MPLS QoS on PFC's and I'm stumped on this question.
In the past MPLS networks I've used Pipe Mode with Explicit Null
LSP to configure QoS within the MPLS network. The benefit of this for a
carrier network was that it preserved the customer markings and allowed
us to control the treatment of the traffic right up to (and including)
the egress of the PE to the carrier owned CPE.
>From reading the documentation on the 7600 I don't see anywhere the
ability to use Pipe Mode with Explicit-Null LSP...I only see Uniform
Mode and Short Pipe Mode. Right away Uniform Mode is out of the
question, and Short Pipe mode is the best alternative, but it only
allows you to control the treatment of the traffic until it reaches the
final PE, at which point the traffic has no MPLS EXP bits left on it
and only the original customer markings are left.
So my question is...am I just missing something regarding the 7600
and its ability to support Pipe mode with Explicit-Null? I'm asking
this because I also noticed that 'set qos-groups' is not available to
do on ingress MPLS-MPLS interfaces...
And if this method of MPLS QoS is not supported on the 7600, whats
the next best thing?...Lastly, if Short Pipe Mode is the only
alternative, then how can the SP still control treatment on the Egress
of the final PE...as all MPLS EXP bits will be stripped during the
final 'pop'.
Thanks in advance MPLS guru's!!!!
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