IGMPv1 Host Membership Report Functions

Hosts use IGMPv1 Host Membership Report message to reply to IGMP Queries and inform the router(s) of their desire to receive multicasts. Multicast hosts use IGMPv1 Host Membership Report messages to communicate to a local router for which multicast groups they want to receive traffic. In IGMPv1, a host sends an IGMPv1 Host Membership Report under the following two conditions: ■ When a host receives an IGMPv1 Query from a local router, it is supposed to send an IGMPv1 Hos..

Using Auto-QoS to Simplify a Configuration

You can also configure Cisco switches to support a variety of other QoS mechanisms and parameters. The list of features and configuration commands can be overwhelming, and the actual configuration can be quite complex. This is one reason why the bulk of QoS topics are no longer covered on the SWITCH exam. Courses and testing aside, you will sometimes need to configure some advanced QoS features on a switch. To reduce the complexity, Cisco introduced the Auto-QoS feature on m..

Protecting Cisco IOS from Intrusion

Now that you have a snapshot of modern security concerns, look at Cisco IOS and the configuration commands you can use to deny intruders the ability to harm valuable network resources that are typically connected behind a Cisco router. In particular, this section covers how you can stop DoS attacks. There are, of course, various Cisco IOS vulnerabilities that can only be protected against by new software releases and regular Cisco IOS bulletins and e-mail blasts from Cisco S..

Tunneling with Dynamic Routing Protocols

Dynamic routing and tunnels can be a dangerous combination. It is critical to ensure that the routers never get confused and think that the best path to the tunnel destination is through the tunnel itself. We offer three different ways of resolving this problem. The first is to use static routes for the tunnel destination address: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#interface Tunnel1 Router1(config-i..

Configuring Routing for a Low-Frequency Multicast Application

PIM-SM is best suited to this type of application. The configurations of the RP and BSR or Auto-RP routers for this example are identical to those. The differences appear on the other routers in the network. So this recipe shows only the configurations for these other routers: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ip multicast-routing Router1(config)#ip pim spt-threshold 10 group-list 15 Router1(con..