Discontiguous Networks

A discontiguous network refers to a network in which a different NIC number separates two instances of the same NIC number. This can happen either through intentional design or through a break in the network topology. If the network is not using a routing protocol that supports VLSM, this creates a problem because the router does know where to send the traffic. Without a subnet mask, it resolves the address down to the NIC number, which appears as if there is a duplicate address. The same NIC number appears twice, but in different locations. In most cases, the router will load balance between the two paths if they are of equal cost. The symptoms that the network will see are those of intermittent connectivity.

Figure 3-11 shows an instance of a discontiguous network.

Figure 3-11 Discontiguous Networks

Figure 3-11 Discontiguous Networks

IP datagram DA=140.100.100.100 SA=199.203.88.9

IP datagram DA=140.100.100.100 SA=199.203.88.9

ROUTER C

Routing table

Network

Next

Outgoing

hop

int

140.100.0.0

????

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