Administration
A31003-S2000-M102-3-76A9, 08/07/2009
3-14
Asterisk - OpenStage Family, Administration Manual
administration.fm
IP Network Parameters
Administration via WBM
Network
> QoS
Administration via Local Phone
3.3.1.2
Layer 3 / Diffserv
Diffserv assigns a class of service to an IP packet by adding an entry in the IP header.
Traffic flows are classified into 3 per-hop behavior groups:
1.
Default
Any traffic that does not meet the requirements of any of the other defined classes is placed
in the default per-hop behaviour group. Typically, the forwarding has best-effort forwarding
characteristics. The DSCP (Diffserv Codepoint) value for Default is "0 0 0 0 0 0".
2.
Expedited Forwarding (EF referred to RFC 3246)
Expedited Forwarding is used for voice (RTP streams) by default. It effectively creates a
special low-latency path in the network. The DSCP (Diffserv Codepoint) value for EF is
"1 0 1 1 1 0".
3.
Assured Forwarding (AF referred to RFC 2597)
Assured forwarding is used for signaling messages by default (AF31). It is less stringent
than EF in a multiple dropping system. The AF values are containing two digits X and Y
(AFXY), where X is describing the priority class and Y the drop level.
Four classes X are reserved for AFXY: AF1Y (high priority), AF2Y, AF3Y and AF4Y (low
priority).
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Administration
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Network
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QoS
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Service
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Layer 2
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Layer 2 voice
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Layer 2 signalling
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Layer 2 default
