CLI Guide

Layer 2 Switching Commands 720
DiffServ
Standard IP-based networks are designed to provide “best effort” data delivery
service. Best effort service implies that the network delivers the data in a
timely fashion, although there is no guarantee that it will meet the latency or
bandwidth requirements. During times of congestion, packets may be
delayed, sent sporadically, or dropped. For typical Internet applications, such
as email and file transfer, a slight degradation in service is acceptable and in
many cases unnoticeable. Conversely, any degradation of service has
undesirable effects on applications with strict timing requirements, such as
voice or multimedia.
Diffserv allows the network operator to classify and apply a distinguished
service to traffic based on a number of criteria. The distinguished service can
meter traffic and apply per hop behavior based upon the bandwidth
utilization and burstiness of traffic. In addition, preferential drop
characteristics can be configured in support of an assured forwarding
capability such that TCP clients are informed if they exceed the switch
buffering limits.
Commands in this Section
This section explains the following commands:
assign-queue match access-group match srcip6 show diffserv
class match class-map match srcl4port show diffserv service
interface
class-map match cos match vlan show diffserv service
brief
class-map rename match destination-
address mac
mirror show interfaces cos-
queue
classofservice
dot1p-mapping
match any police-simple show interfaces
random-detect
classofservice ip-
dscp-mapping
match dstip police-single-rate show interfaces traffic
classofservice trust match dstip6 police-two-rate show interfaces
utilization