Verifying The Qos Configuration; About Ip Qos On The Enhanced Gigabit Ethernet And Enhanced Atm Router Module Interfaces - Cisco Catalyst 8540 MSR Configuration Manual

About IP QoS on the Enhanced Gigabit Ethernet and Enhanced ATM Router Module Interfaces

Verifying the QoS Configuration

To verify the QoS configuration, use the following commands:
Command
show qos switching
show qos mapping [source source-interface]
[destination dest-interface]
About IP QoS on the Enhanced Gigabit Ethernet and Enhanced
ATM Router Module Interfaces
DiffServ is a mechanism by which network service providers offer differing levels of network service to
different traffic classes in order to provide QoS to users.
The IP QoS feature is only applicable for enhanced Gigabit Ethernet and enhanced ATM Router Modules
Note
installed in the Catalyst 8540 MSR chassis.
In a DiffServ network, routers, within the network handle packets on different traffic flows by applying
different per-hop behaviors (PHBs). The PHB to be applied is signalled in-band, and is specified by a
DiffServ code-point (DSCP) in the IP header of each packet. No explicit out-of-band signalling protocol
such as RSVP is used. Per-hop behaviors are defined to configure granular allocation of bandwidth and
resource buffering at each node. Per-flow or per-user forwarding state is not maintained within each node
of network. The advantage of such a scheme is that many traffic flows can be aggregated to one of a small
number of PHBs, simplifying the processing requirement on each router.
The following components are the building block in the Catalyst 8540 Differentiated Services
implementation:
Figure 22-1
points in the forwarding path.
ATM Switch Router Software Configuration Guide
22-6
Packet Classification
Traffic Conditioning
Marking
•
Metering and Policing
•
Per hop behavior (PHB) definition
• Congestion control
• Queueing, scheduling, buffer management
shows all the DiffServ components and their distribution between the ingress and egress
Chapter 22 Configuring Quality of Service
Purpose
Displays whether QoS-based switching is
enabled.
Displays effective mapping at either the system
level or interface-pair level.
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