Unequal-Cost Load Balancing in IGRP
IGRP and RIP provide the capability to install up to six parallel equal-cost paths for load balancing. IGRP has an added feature that RIP does not have—the capability to do unequal-cost load balancing, the capability to load-balance traffic over multiple paths that do not have the same metric to the destination. The advantage of this feature is that it offers the flexibility of load balancing, thus making more efficient use of the link. IGRP uses the variance command to per..
When you first receive a Catalyst from Cisco, it has no password set. In other words, the password is <ENTER> to enter both the EXEC and privilege modes. Your first task as a conscientious network administrator should be to change the passwords to the unit. This helps to prevent unauthorized children in adult form from modifying the Catalyst and disrupting your network. Example 4-11 shows a Catalyst session where the user changes the EXEC and enable passwords. The user ..
The Need for Queuing on Frame Relay Networks
Modern Frame Relay networks service a mixed variety of traffic types from users. Among the different types of traffic, mission-critical and delay-sensitive traffic are extremely susceptible to network latency. For example, delay-sensitive traffic, such as voice, is intolerant to network latency and delay largely because of the nature of the application. Network latency and delay could cause voice packets to be delayed, lost, or arrive out of order. This can severely impact th..
Spanning-Tree Communication: Bridge Protocol Data Units
STP operates as switches communicate with one another. Data messages are exchanged in the form of bridge protocol data units (BPDU). A switch sends a BPDU frame out a port, using the unique MAC address of the port itself as a source address. The switch is unaware of the other switches around it, so BPDU frames are sent with a destination address of the well-known STP multicast address 01-80-c2-00-00-00. Two types of BPDU exist: ■ Configuration BPDU, used for spanning-tree..
The first step in configuring IP Mobility in your network is to set up one or more Home Agent routers, which will act as the virtual home base and support tunnels for your roaming devices: RouterHome#configure terminal Enter configuration commands, one per line. End with CNTL/Z. RouterHome(config)#interface Loopback0 RouterHome(config-if)#ip address 192.168.9.1 255.255.255.255 RouterHome(config-if)#exit RouterHome(config)#router mobile RouterHome(config-router)#e..
