Users Guide

Differentiated Services 1533
Dell EMC Networking N-Series switch software supports the Traffic
Conditioning Policy type which is associated with an inbound traffic class
and specifies the actions to be performed on packets meeting the class
rules:
– Marking the packet with a given DSCP, IP precedence, or CoS value.
Traffic to be processed by the DiffServ feature requires an IP header if
the system uses IP Precedence or IP DSCP marking.
– Policing packets by dropping or re-marking those that exceed the
class’s assigned data rate.
– Counting the traffic within the class.
• Service: Assigns a policy to an interface for inbound traffic.
Class-Map Processing
An incoming packet is matched against the criteria in the match terms
specified in each class-map in a DiffServ policy. The
match terms (clauses)
may refer to one or more MAC, IPv4, and IPv6 access-groups. Use the match
protocol command to select the type of access-group. Multiple access-group
match terms are allowed in a class-map if the match criteria is match-all, each
access-group consisting of a list of permit and deny statements. A single
access-group is allowed if the match criteria is match-any.
If the built-in class-map match criteria are utilized, an access-group match
may not be included in the class-map. Likewise, if an access-group match is
specified, the built-in match criteria may not be included.
Conceptually, class-map ACL processing proceeds by attempting to match
each of the ACLs listed in the class-map match clauses, in order. If an ACL
does not match, processing moves to the next ACL, in order, until an ACL
matches, or the ACL list is exhausted. If there are more match terms in the
class-map, processing proceeds with the next match term, in the order
specified. In reality, all rule matches in an access-group are attempted in
NOTE: An 802.1X authenticator or RADIUS server can be used to dynamically
assign DiffServ policy to ports when a host connects to a port and authenticates
by using 802.1X. For more information, see "How Does the Authentication Server
Assign DiffServ Policy or ACLs?" on page 366