Avaya Cajun P580, Руководство пользователя, Страница: 670 / 770

25-10 User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0
Chapter 25
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access-list List1 8 fwd8 10.10.130.0 0.0.0.255
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access-list List1 512 permit use-priority 6 any (default ACL rule)
All packets that have a source IP address in the 10.10.60 subnet are assigned
a priority of 1(fwdx is 1 based, but priorities are 0 based.) All packets that
have a source IP address in the 10.10.70 subnet are assigned a priority of 3,
and so on. Any packets whose source IP addresses do not match the IP
addresses in ACL rules one through eight, are assigned a priority of 6.
For information on how to set up a default ACL rule, see “ Setting Up a
Default ACL Rule ” later in this chapter.
Diffserv
RFC 2475 defines a field in the layer 3 header of IP packets, called the
DiffServ code point (DSCP). Typically, hosts or routers sending traffic into
a DiffServ network mark each transmitted packet with the appropriate
DSCP. The switch then uses the DSCP to classify packets. You can
alternately set the switch to replace the DSCP in a packet with a different
DSCP. The switch then uses the new DSCP to classify the packet.
To set the switch to classify IP packets by their DSCP or to replace the
DSCP with a different DSCP, you must set up an ACL rule. For information
on how to set up an ACL rule to enable DiffServ functionality, see “
Setting
Up an ACL Rule ” later in this chapter.
The Differentiated Services (DiffServ) Mapping Table associates specific
DSCP values with specific priorities. You create these associations by
assigning priorities to DSCPs. For information on how to assign priorities to
DSCPs, see “
Assigning a Priority to a DSCP ” later in this chapter.
Because the DSCP is located in the layer 3 header, the switch does not
typically use the DSCP to classify bridged IP traffic. However, you can set a
physical port to use the DSCP to classify bridged IP traffic. For information
on how to set a physical port to use DiffServ, see “
Setting a Physical Port to
Use DiffServ ” later in this chapter.