03-18-2009 07:21 AM - edited 03-06-2019 04:40 AM
Hi all, can anyone give me a simple config for qos for my voice traffic, I need to prioritize the signalling for af21 and payload for ef46
please help
cheers
Carl
03-18-2009 07:35 AM
03-18-2009 12:54 PM
(For many routers.)
class-map match-any payload
match dscp ef46
class-map match-any signalling
match dscp af21
policy-map simple
class payload
priority . . .
class signalling
bandwidth . . .
interface ?
service-policy output simple
03-18-2009 02:35 PM
can you tell me what config you would out in these ?
class payload
priority . . .
class signalling
bandwidth . . .
?
03-18-2009 04:44 PM
Unsure what you're asking. If you're wondering about the " . . . ", that's where you specify the bandwidth allocations. Syntax depends on IOS version and how you desire to specify bandwidth; value depends on what your VoIP traffic needs.
03-19-2009 03:46 AM
hi
thanks for the reply
so, would this be the minimum bandwidth allowed ,what would you normally put for this?
03-19-2009 03:54 AM
Carl,
That would highly depend on your VoIP requirements.
1) VoIP Codec
2) Number of Calls
3) Concurrent Calls
4) Call Signaling
5) VoIP Keepalives
If you do not know the above - you need to, otherwise your VoIP and QoS will not meet your requirements.
03-19-2009 04:19 AM
ok,
voip codec, g729
max calls say 20
concurrent 10
call signalling h323
dont know about voip keepalives
03-19-2009 04:31 AM
OK - so:-
(G729 Codec)x(# of concurrent calls) = Bandwidth required for LLQ
03-19-2009 06:04 AM
According to the following, http://www.cisco.com/en/US/products/ps10030/products_qanda_item09186a0080a36a8e.shtml#qa3, G729 uses 24 Kbps per call.
Somewhere on Cisco's site, I recall there's better documentation for bandwidth requirements, but unable to find it at the moment. Hopefully such documentation would also provide bandwidth needed for signalling, although generall that's not too much (10% to 20% of the bearer bandwidth?)
03-19-2009 06:42 AM
what kind of qos would this be called, just priotising, or is it policing ?
03-19-2009 06:50 AM
For the voice bearer traffic, both. (The sample config I provide uses CBWFQ and places the voice bearer traffic into LLQ, which sends its traffic first, but also polices the maximum bandwidth when there's congestion.)
For the signally traffic, bandwidth reservation. (Normal CBWFQ classes, should guarantee a minimum defined bandwith when there's congestion, although more might be used.)
03-19-2009 07:10 AM
This is what you were refering to:-
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