MLS Logic

Layer 3 switching configuration works similarly to router configuration—IP addresses are assigned to interfaces, and routing protocols are defined. The routing protocol configuration works just like a router; however, the interface configuration on MLS switches differs slightly from routers, using VLAN interfaces, routed interfaces, and PortChannel interfaces. VLAN interfaces give a Layer 3 switch a Layer 3 interface attached to a VLAN. Cisco sometimes refers to these inter..

Processes of Link-State Protocols

The link-state protocols consist of four processes: Receive process   The received information is processed, and then is given to the update process. The receive process does not make decisions—it simply forwards information to the two other processes.   Update process   Receives information from the receive process, processes the information received from all the neighbors, and creates information about the local router states. The updat..

How Multicasting Provides a Scalable and Manageable Solution

The six basic requirements for supporting multicast across a routed network are as follows: ■ A designated range of Layer 3 addresses that can only be used by multicast applications must exist. A network administrator needs to install a multicast application on a multicast server using a Layer 3 multicast address from the designated range. ■ A multicast address must be used only as a destination IP address, and specifically not as a source IP address. Unlike a unicast I..

Using RSVP

Basic RSVP configuration is relatively simple. All you need to do is define how much bandwidth can be reserved on the interface: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#interface FastEthernet0/0 Router(config-if)#ip rsvp bandwidth 128 56 Router(config-if)#exit Router(config)#end Router# Some network administrators have to worry about unauthorized use of bandwidth reservation. You can control this by specify..

Using Time-Based Access-Lists

To filter application data based on the time of day, use the following commands: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z.Router1(config)#time-range NOSURFRouter1(config-time-range)# periodic weekdays 9:00 to 17:00Router1(config-time-range)#exitRouter1(config)#ip access-list extended NOSURFINGRouter1(config-ext-nacl)# deny   tcp any any eq www time-range NOSURFRouter1(config-ext-nacl)# permit ip any anyRouter1(con..