user manual

REVIEW DRAFT—CISCO CONFIDENTIAL
14-22
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 14 Ethernet Operation
14.5.3 E-Series Shared Packet Ring Ethernet Circuits
14.5.3 E-Series Shared Packet Ring Ethernet Circuits
A shared packet ring allows nodes other than the source and destination nodes to access an Ethernet STM
circuit. The E-Series card ports on the additional nodes can share the circuit’s VLAN and bandwidth.
Figure 14-20 illustrates a shared packet ring. Your network architecture may differ from the example.
Figure 14-20 Shared Packet Ring Ethernet Circuit
14.5.4 E-Series Hub-and-Spoke Ethernet Circuit Provisioning
The hub-and-spoke configuration connects point-to-point circuits (the spokes) to an aggregation point
(the hub). In many cases, the hub links to a high-speed connection and the spokes are Ethernet cards.
Figure 14-21 illustrates a hub-and-spoke ring. Your network architecture may differ from the example.
ONS 15454
SDH
ONS 15454
SDH
Access router
Backbone router
Access router
Access router
Access router
SDH Ring
Access router Access router
ONS 15454
SDH
71325
SDH
Ethernet