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Building a fault-tolerant, rapid-recovery network is a concept that is new to the data world. One reason for this is that data communications philosophy hinges on the premise that the data will either reach its destination or be retransmitted until it does. This philosophy does not work well in voice networks. To ensure that MPLS is both competitive with ATM and on par with voice networks, rapid-recovery procedures must be implemented.
Several methods of providing network protection are currently under study. Vendors recommend approaches that are supported by their overall design concepts and specifications; therefore, failure-recovery procedures and protocols are not necessarily interoperable among different vendors. Design teams must carefully select vendors with interoperable recovery methods.
The failure-recovery method that has received much favorable press lately is RSVP-TE. The soft-state operations of RSVP-TE make it very suitable for failure recovery. One reason is that the polling (reservation/path) functions are already in place for signaling. If RSVP-TE is already used for a signaling protocol, it makes for a logical selection in protection of MPLS tunnels.
Knowledge Review | Answer the following true/false questions.
Answers: 1. True; 2. true; 3. true; 4. false; 5. true; 6. true. |
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