Important! Do not use plain text authentication in RIP packets for security purposes, because the unencrypted authentication key is sent in every RIP Version 2 packet. Use plain text authentication when security is not an issue (for example, to ensure that incorrectly configured hosts do not participate in routing).
Command | Purpose |
ip rip authentication mode | Configure the interface to use MD5 digest |
{text md5} | authentication or let it default to simple password |
| authentication. |
ip rip authentication string | Set the interface with plain text authentication. The |
string | string must be shorter than 16 characters. |
5.4.12 Monitor and Maintain RIP
The user can display specific router statistics, such as the contents of IP routing tables and databases, in order to monitor and maintain RIP. Information provided can be used to determine resource utilization and solve network problems. It is also possible to discover the routing path the packets are taking through the network.
To display various router statistics, perform the following tasks in top mode.
Command | Purpose |
show ip rip | Display general information about RIP routing |
| processes in a particular router. |
show ip protocols | Display the parameters and current state of the active |
| routing protocol process. |
To quickly diagnose problems, the debugging commands are useful to users. Use the following commands in privileged top configuration mode to display information on RIP routing transactions.
Command | Purpose |
debug ip rip events | Display RIP events including sending and receiving |
| packets and changes in interfaces. |
debug ip rip packet [recv | Display detailed information about the RIP packets. |
send] | The information includes the origin and port number |
debug ip rip packet [recv | of the packet as well as a packet dump. |
send] detail |
|
show debugging rip | Show all information currently set for RIP debug. |
5.5 Configuring IP Multicast Routing
Multicast traffic is a means to transmit a multimedia stream from the Internet (a video conference, for example) without requiring a TCP connection from every remote host that wants to receive the stream.
Traditional IP communication allows a host to send packets to one host (unicast transmission) or to all hosts (broadcast transmission). IP multicast provides a third scheme, allowing a host to send packets to a group of hosts (group transmission). A multicast address is chosen for the members of a multicast group. Senders use that address as the destination address of a datagram to reach all hosts of the group. The stream is sent to the multicast address, and from there it’s delivered to all interested parties on the Internet. Any host, regardless of whether it is a member of a group, can send to that group. However, only the members of the group receive the message.
The IC35516 supports the following protocols to implement IP multicast routing:
•Internet Group Management Protocol (IGMP): used between hosts on a LAN and the router(s) on that LAN to track the multicast groups of which hosts are members
•Distance Vector Multicast Routing Protocol (DVMRP): used on the MBONE (the multicast backbone of the Internet)
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