Alternatively, it may be
desirable for the failure to result in a switch to a protection subchannel to replace the
failed channel. The protection mechanisms are very similar to those of previous solutions
that deal with aggregated signals.
Packet Network Benefits
Current IP routers can process 10Gb/s of packets. Each time port speeds have been
increased in the short history of these devices, network builders have immediately
adopted the faster technology. The benefits of high-speed ports are significant for data
networks.
Several factors drive data network builders to implement higher-speed ports. The
first is that the alternative, deploying several parallel links, leads to management and
scalability issues. Each link in the data network is monitored and maintained by a linklayer
protocol such as OSPF. The status of each link in the network must be monitored,
maintained, and distributed to many of the elements in the network. As the number of
links increase, even with parallel ports, the task of maintaining the link state tables
is increased.
Another simplifying factor is that very large LSPs can be created in the superchannel
and more effectively packed with data.
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