Alternatives to the OSPF Network Command
As of Cisco IOS Software Release 12.3(11)T, OSPF configuration can completely omit the network command, instead relying on the ip ospf process-id area area-id interface subcommand. This new command enables OSPF on the interface and selects the area. For instance, on R3 in Example 10-8, the network 10.3.0.0 0.0.255.255 area 3 command could have been deleted and replaced with the ip ospf 1 area 3 command under S0/0.1 and e0/0. The network and ip ospf area commands have some mi..
IGMP Snooping: Advanced Traffic Management
Life isn't perfect. Therefore, not everyone uses Cisco routers, even though they might use Cisco switches. What do you do if the user has non-Cisco routers in the system along with Catalysts? Or for that matter, what do other vendor products do with multicast frames? You cannot use CGMP in a non-Cisco environment because it is a Cisco proprietary feature. Many other vendors use a software feature where the switch processor examines each frame transferred through the switch. ..
FTP, an application layer protocol of the TCP/IP protocol suite of applications, allows users to transfer files from one host to another. Two ports are required for FTPone port is used to open the connection (port 21), and the other port is used to transfer data (20). FTP runs over TCP and is a connection-oriented protocol. To provide some level of security, FTP allows usernames and passwords to be exchanged before any data can be transferred, adding some form of security aut..
DLSw+ Redundancy and Fault Tolerance
There are several things you can do to improve the reliability and fault tolerance of your network. Many of these solutions have the added benefit of improving performance. The first important thing to consider is having more than one DLSw peer router connected to the mainframe's Token Ring. In this case, you will want to make sure that you balance the load between the two peers as much as possible: dlsw-branch#configure terminal Enter configuration commands, one per line.&n..
Logging When an Access-List Is Used
Access-lists can generate log messages. The following example allows all packets to pass, and records them: Router1#configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router1(config)#access-list 150 permit ip any any logRouter1(config)#interface Serial0/1Router1(config-if)#ip access-group 150 in Router1(config-if)#exitRouter1(config)#endRouter1# And in this example, we use the log-input keyword to include additional information about ..
