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For some reason when I merged 802.1p support, the new documentation file was 

not properly added.  Thanks to IgorG for pointing it out!  :)


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@62671 f38db490-d61c-443f-a65b-d21fe96a405b
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russell 2007-05-02 15:17:26 +00:00
parent 3e19b32d33
commit d60a150729
1 changed files with 40 additions and 2 deletions
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42
doc/ip-tos.tex → doc/qos.tex
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@ -5,14 +5,22 @@ for various protocols. The TOS byte is used by the network to provide
some level of Quality of Service (QoS) even if the network is
congested with other traffic.
Also asterisk running on Linux can set 802.1p CoS marks in VLAN packets
for all used VoIP protocols. It is useful when you are working in switched
enviropment. For maping skb->priority and VLAN CoS mark you need to use
command "vconfig set_egress_map [vlan-device] [skb-priority] [vlan-qos]".
\subsubsection{SIP}
In sip.conf, there are three parameters that control the TOS settings:
"tos\_sip", "tos\_audio", and "tos\_video". tos\_sip controls what TOS SIP call
signalling packets are set to. tos\_audio controls what TOS RTP audio
"tos\_sip", "tos\_audio" and "tos\_video". tos\_sip controls what TOS SIP
call signalling packets are set to. tos\_audio controls what TOS RTP audio
packets are set to. tos\_video controls what TOS RTP video packets are
set to.
There are four parameters to control 802.1p CoS: "cos\_sip", "cos\_audio",
"cos\_video" and "cos\_text". It's behavior the same as writen above.
There is a "tos" parameter that is supported for backwards
compatibility. The tos parameter should be avoided in sip.conf
because it sets all three tos settings in sip.conf to the same value.
@ -29,6 +37,14 @@ IAX packets generated by an IAXy cannot have different TOS settings
based upon the type of packet. However different IAXy devices can
have different TOS settings.
\subsubsection{H.323}
Also support TOS and CoS.
\subsubsection{MGCP}
Also support TOS and CoS.
\subsubsection{IP TOS values}
The allowable values for any of the tos* parameters are:
CS0, CS1, CS2, CS3, CS4, CS5, CS6, CS7, AF11, AF12, AF13,
AF21, AF22, AF23, AF31, AF32, AF33, AF41, AF42, AF43 and
@ -41,6 +57,12 @@ deprecated because they set the IP TOS using the outdated "IP
precedence" model as defined in RFC 791 and RFC 1349. They still
work in this version of Asterisk, but will be removed in future releases.
\subsubsection{802.1p CoS values}
As 802.1p uses 3 bites from VLAN header, there are parameter can take
integer values from 0 to 7.
\begin{verbatim}
===========================================
Configuration Parameter Recommended
@ -49,15 +71,31 @@ File Setting
sip.conf tos\_sip cs3
sip.conf tos\_audio ef
sip.conf tos\_video af41
sip.conf tos\_text af41
sip.conf cos\_sip 4
sip.conf cos\_audio 6
sip.conf cos\_video 5
sip.conf cos\_text 0
-------------------------------------------
iax.conf tos ef
iax.conf cos 6
-------------------------------------------
iaxprov.conf tos ef
-------------------------------------------
mgcp.conf tos ef
mgcp.conf cos 6
-------------------------------------------
h323.conf tos ef
h323.conf cos 6
===========================================
\end{verbatim}
\subsubsection{Reference}
IEEE 802.1Q Standard:
http://standards.ieee.org/getieee802/download/802.1Q-1998.pdf
Related protocols: IEEE 802.3, 802.2, 802.1D, 802.1Q
RFC 2474 - "Definition of the Differentiated Services Field
(DS field) in the IPv4 and IPv6 Headers", Nichols, K., et al,
December 1998.