'Re: [c-nsp] DSCP and Queue counters on 7600s'

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List:       cisco-nsp
Subject:    Re: [c-nsp] DSCP and Queue counters on 7600s
From:       Tony via cisco-nsp <cisco-nsp () puck ! nether ! net>
Date:       2015-12-14 22:37:46
Message-ID: mailman.621.1450132653.1209.cisco-nsp () puck ! nether ! net
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Date: Mon, 14 Dec 2015 22:37:29 +0000 (UTC)
From: Tony <td_miles@yahoo.com>
Reply-To: Tony <td_miles@yahoo.com>
To: James Bensley <jwbensley@gmail.com>, 
	"cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net>
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Subject: Re: [c-nsp] DSCP and Queue counters on 7600s
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Looks like CR/LF got mangled in my previous reply attempt, trying again...

=====

In the past I have used a qos policy that "does nothing" to monitor the traffic. It \
at least lets me see the number of bytes that matched each DSCP, even if not being \
able to see in real time what is in the queues. The one below only shows CS3 traffic, \
but you would just build it up to add the other things you need to monitor. The "set" \
statement doesn't really do anything, because the packets should already be marked \
with what they are being set to, it's just there to force the box to count the \
packets because it has to do something on them, so "touches" the packet and forces a \
counter increment. Unfortunately it doesn't show packet count (just bytes and rate in \
bps). You could apply the same policy in the outbound direction to show similar info. \

class-map match-any class-dscp24 
match ip dscp cs3 

policy-map monitor-qos 
class class-dscp24 
set ip dscp 24 
class class-default 
set ip dscp 0 

int gig7/16 
service-policy input monitor-qos 

#show policy-map int gig7/16 
GigabitEthernet7/16 

Service-policy input: monitor-qos 

class-map: class-dscp24 (match-any) 
Match: ip dscp cs3 (24) 
set dscp 24: 
Earl in slot 5 : 
0 bytes 
5 minute offered rate 0 bps 
aggregate-forwarded 0 bytes 

class-map: class-default (match-any) 
Match: any 
set dscp 0: 
Earl in slot 5 : 
536 bytes 
5 minute offered rate 32 bps 
aggregate-forwarded 536 bytes 

So you can see that since I applied the policy there has been 536 bytes of traffic \
inbound that matched the default class (this interface is used for testing stuff, so \
doesn't really have anything much attached to it). 

Two other options come to mind: 

1. SPAN/mirror the port and hook something useful up to see what is happening (eg. \
tcpdump, wireshark, etc).  2. I have never used it, but there is a thing called "PFC \
QoS statistics data export" which MIGHT do what you want (purely based on what the \
description of it says). 

Best of luck, 
Tony. 

________________________________
From: James Bensley <jwbensley@gmail.com>
To: "cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net> 
Sent: Monday, 14 December 2015, 19:31
Subject: Re: [c-nsp] DSCP and Queue counters on 7600s

On 13 December 2015 at 18:19, Lukas Tribus <luky-37@hotmail.com> wrote:
> 
> > Hi All,
> > 
> > Got some 7600s with RSP720-3CXL-10G and LAN cards (CFC, no DFCs) and
> > I'm "trying" to run QoS on them.
> > 
> > Does anyone know of a command to show the number of packets that
> > entered each queue/show some queue counters?
> 
> Afaik this should be it:
> show queueing interface <intfname>

Sadly that command isn't supported:

abr1#show q?
qbm

"show mls qos queuing int te3/1" shows me the MLS QoS configuration
such queue depths, bandwidth allocation, thresholds etc and the total
number of drop packets per CoS marking/queue. It doesn't show counters
per queue.

"show counters interface te3/1" is the same, it only shows lost
packets tx/rx, so if I use multiple instances of a basic traffic
generator like iPerf with different DSCP markings on each flow I don't
actually know which queues the packets are going into (so if there is
unexpected drops or traffic isn't being dropped etc, it's just guess
work).

This seems like a major floor to me. In the TAC case I have open the
engineer is saying he doesn't believe there is such a command.
Disappointing.

Cheers,
James.

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