Level of ISP Internet Access Redundancy
Murphy is out there, ready to make your life miserable. Whether because of bad weather, carrier problems, or just plain bad luck, an ISP's connection to a NAP, another provider, or another POP will become unavailable at some point, potentially resulting in the inability to reach all or a set of destinations. A redundant network enables traffic to utilize an alternative path to reach those destinations until the problem has been corrected. A well-designed ISP network has POPs ..
Several types of LSAs exist. This section discusses the nine types of LSAs documented in Table 8-2. Table 8-2. Types of LSA Type LSA Functionality 1 Router Defines the state and cost of the link to the neighbor and IP prefix associated with the point-to-point link. 2 Network Defines the number of routers attached to the segment. It gives information about the subnet mask on that segment. 3..
This section presents a sample network to summarize the configuration for MPCs and MPSs. Figure 10-9 Sample MPOA Network illustrates the network where two MPCs interconnect through one MPS. Figure 10-9. Sample MPOA Network The MPCs reside inside of Catalysts equipped with MPOA-capable LANE modules. The MPS resides in a 7204 router. Each MPC has one LEC enabled. The MPS has two LECs enabled, one for each of the two ELANs. The LECS and LESs reside in the 7204 rout..
To participate in STP, each port of a switch must progress through several states. A port begins its life in a Disabled state, moving through several passive states and, finally, into an active state if allowed to forward traffic. The STP port states are as follows: ■ Disabled—Ports that are administratively shut down by the network administrator, or by the system because of a fault condition, are in the Disabled state. This state is special and is not part of the n..
Using the area x range configuration command on your ABRs allows you summarize routes between OSPF areas: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#router ospf 55 Router1(config-router)#area 100 range 172.20.0.0 255.255.0.0 Router1(config-router)#area 0 range 172.25.0.0 255.255.0.0 Router1(config-router)#area 2 range 10.0.0.0 255.0.0.0 Router1(config-router)#exit Router1(config)#end Router1# The easiest way..
