MQC separates the classification function of a QoS tool from the action (PHB) that the QoS tool wants to perform. To do so, there are three major commands with MQC, with several subordinate commands: ■ The class-map command defines the matching parameters for classifying packets into service classes. ■ The PHB actions (marking, queuing, and so on) are configured under a policy-map command. ■ The policy map is enabled on an interface by using a service-policy comman..
The Internetwork Control Message Protocol (ICMP) allows for testing and troubleshooting of the TCP/IP internetwork layer by defining messages that can be used to determine whether the network can currently deliver packets. In fact, ICMP is a required component of every IP implementation, as described in the following brief excerpt from RFC 792: Occasionally a gateway or destination host will communicate with a source host, for example, to report an error in datagram processin..
Viewing Dynamic Routing Protocol Information
The operation and configuration of the dynamic routing protocols can be verified with a number of IOS EXEC commands. These commands fall into two categories, protocol-independent and protocol-specific. Let's look at the protocol-independent commands first. As examined in the section "Configuring IP Routing Protocols," the IOS EXEC command show ip route can be used to determine whether routes are being learned via dynamic routing protocols and to determine the attributes of t..
A primary function of access-edge policies is to establish and enforce trust boundaries. A trust boundary is the point within the network where markings (such as CoS or DSCP) begin to be accepted. Previously set markings are overridden (as required) at the trust boundary. The design objective relating to trust boundaries is to enforce these as close to the endpoints as technically and administratively possible. This is illustrated in Figure 12-3. Figure 12-3. Establishing T..
Viewing DLSw Status Information
This command shows the status of a DLSw peer relationship: Router>show dlsw peers Peers: state pkts_rx pkts_tx type drops ckts TCP uptime TCP 10.1.1.5 CONNECT 350 350 conf ..
