Even when PIM routing is in place, RPs must be configured correctly to find traffic sources. The command show ip pim rp allows you to inspect the configured RPs and look at the mappings that have been applied. The full command is Router(config)#show ip pim rp [group-name | group-address | mapping] Using show ip pim rp, without further modifiers, displays RPs for active groups. If the command is modified with the group name, then only the RPs for the select..
FTP clients and servers use the typical TCP/IP client/server model for the FTP control connection, with the client initiating a TCP connection to well-known FTP port 21. FTP transfers commands and command acknowledgements over the this TCP control connection. However, at some point, data needs to be transferred—and FTP uses a separate but correlated TCP connection for the actual data transfer. FTP clients use one of two modes, passive or active, to define the details of ho..
The point-to-multipoint model is very similar to the point-to-point model. It provides one subnet for an entire cloud, and it maintains host routes to all the routers within the cloud. This also allows the use of non-meshed routers. TIP A new command was recently introduced to overcome the problem of sending multicast OSPF packets on the media that form dynamic connections, such as ATM SVC. By default, OSPF sends multicast packets to discover neigh..
Comparing Wireless and Wired LANs
How exactly does a wireless LAN get integrated with a wired LAN? Where does switching fit into a wireless LAN? Before answering these questions, it might be helpful to see how the two technologies compare. At the most basic level, switched networks involve wires, and wireless networks don’t. That might seem silly, but it points out some major differences in the physical layer. A traditional Ethernet network is defined by the IEEE 802.3 standards. Every Ethernet connection ..
Setting the IP Source Address for SNMP Traps
To set the default IP source address for all traps leaving a router, use the following configuration command: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#snmp-server host 172.25.1.1 ORATRAP Router(config)#snmp-server trap-source loopback0 Router(config)#end Router# Normally, when you enable SNMP traps to a remote server, that server will see the source IP address of the router's closest interface. However, this..
