Further, the process of troubleshooting and recovery from failures will
be rapid and employ tools that will minimize operational expenditures for the
Service Provider and any adverse impact on the end users.
?– Protection Carrier Ethernet services provide an end-to-end service-level protection
that encompasses protection against any failures in the underlying infrastructure
employed in the delivery of the services. This means protection against
failures in the end-to-end ???path??? of the service, as well as against any underlying
physical link and node equipment failures.
?– Restoration Carrier Ethernet provides similar or better recovery than SONET.
The benchmark for resiliency in Service Provider networks has long been the
52 Chapter 2
SONET sub-50 ms service restoration to support circuit-switched voice networks.
As latency-sensitive voice and video applications are deployed over a Carrier
Ethernet infrastructure, this SONET-like resiliency is a critical prerequisite.
Techniques such as Spanning Tree Protocol (STP) and its variants, while feasible
in the LAN, are simply not acceptable in large Service Provider networks because
depending on the size and complexity of the network, recovery of failures employing
these techniques takes in the range of several seconds to even minutes.
Pages:
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192