Default/Recommended QoS Classification and Marking for Voice Packets

These are taken from the QoS SRND guide.

!
class-map match-all Voice
match ip dscp ef                          ! IP Phones mark Voice to EF (46)
class-map match-any Call Signaling
match ip dscp cs3                       ! Future Call-Signaling marking
match ip dscp af31                     ! IP Phones mark Call-Signaling (SCCP/MGCP)
!
policy-map WAN-EDGE
class Voice
priority percent 33                    ! Maximum recommended LLQ value
compress header ip rtp            ! Optional: Enables Class-Based cRTP
class Call Signaling
bandwidth percent 5                 ! BW guarantee for Call-Signaling
class class-default
fair-queue                                      ! All other data gets fair-queuing
!
Ok, now tell me why Auto QoS reserves 70% priority bandwidth for voice RTP class instead of 33% recommended? I’m still finding the answer…..
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About Mijanur Rahman
I have started blogging to save and share my study notes, findings and research notes as I have already lost some important! Wish you find something helpful from my blogs, if you have anything to ask you are always welcome to comment or contact me directly. Thanks, Md. Mijanur Rahman

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