I'd be curious when "auto qos voip" changed to CS3 or if it has, but you should
change it.
The feeling is that QoS SRND needs to be updated for MediaNet/RFC4594 and that
Auto QoS should only be used in most basic scenarios.
The QoS Baseline recommends marking Call-Signaling to CS3. However, currently
most Cisco IP
Telephony products mark Call-Signaling to AF31. A marking migration from AF31
to CS3 is under way
within Cisco, but in the interim it is recommended that both AF31 and CS3 be
reserved for
Call-Signaling and that Locally-Defined Mission-Critical Data applications be
marked to a temporary
placeholder non-standard DSCP, such as 25. Upon completion of the migration,
the QoS Baseline
marking recommendations of CS3 for Call-Signaling and AF31 for Locally-Defined
Mission-Critical
Data applications should be used. These marking recommendations are more in
line with RFC 2474 and
RFC 2597.
From: ccie_voice-boun...@onlinestudylist.com
[mailto:ccie_voice-boun...@onlinestudylist.com] On Behalf Of Berry, Matthew J.
Sent: Thursday, March 18, 2010 5:55 AM
To: CCIE Voice OSL (ccie_voice@onlinestudylist.com)
Subject: [OSL | CCIE_Voice] Need Clarification: mls qos map cos-dscp
The QoS SRND states that the "auto qos voip" command adds the following config
to the router:
C2970(config)# mls qos
C2970(config)# mls qos map cos-dscp 0 8 16 26 32 46 48 56
Earlier in the SRND, around page 40, it says that the old marking for audio
signaling was AF31 (26). That is the same DSCP marking listed above.
As part of our "best-practice" scenario, should we be changing the command to
consider audio signaling as CS3 (24)? The command would need to be modified:
C2970(config)# mls qos map cos-dscp 0 8 16 24 32 46 48 56
Is this true? Otto, can you weigh in on this one?
Thanks!
Matthew Berry
Digital Footprint:
Twitter: ciscovoiceguru
Skype: ciscovoiceguru
1st Lab Attempt: Aug 16th, 2010
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