Cisco ONS 15454 E-Series Ethernet interface cards integrate a Layer 2 switch into the SONET/SDH platform, enabling multipoint Ethernet service delivery within the optical transport network. Additionally, through the use of the E Series "port-mapped" mode, point-to-point Ethernet services can be provisioned. The two cards included in the E Series, the E100T-12/E100T-G and the E1000-2/E1000-2-G cards, were the initial Ethernet interface cards introduced with the ONS 15454 platform. (The E100T-G and E1000-2-G are later versions, with the additional capability of functioning with XC10G-equipped systems.) Although these cards are based on solid technologies, the later generations of Ethernet interfaces provide capabilities that the E-Series cards do not. For example, the CE Series and G Series provide for more efficient ways of delivering point-to-point services, while the ML-Series cards deliver a much richer feature set for multipoint services than the E-Series cards. For this reason, E-Series cards are most often found in existing networks and are typically not chosen for new network builds. The E-Series cards are covered only briefly in this chapter; you can find additional information in the Cisco ONS 15454 User Documentation, available at Cisco.com. Table 7-1 provides a summary of the cards included in the E Series. Both 10-/100-Mbps Ethernet/Fast Ethernet and 1000-Mbps GigE versions of the E Series are available.
ONS 15454 E-Series Card Modes and Circuit SizesE-Series cards can be placed in any of the ONS 15454 traffic card slots (16 and 1217), and can operate in three different modes: single-card EtherSwitch, multicard EtherSwitch, and port-mapped mode. These modes are briefly described as follows:
Table 7-2 lists the circuit sizes that can be used to link E-Series cards for each mode.
Note GigE transport with the E-Series GigE cards is limited to 600 Mbps because Synchronous Transport Signal (STS)-12c is the maximum bandwidth that can be terminated to the card. In addition, 10-Mbps Ethernet service requires a minimum circuit size of STS-1 (approximately 50 Mbps), and 100-Mbps Fast Ethernet service requires a minimum circuit size of STS-3c (150 Mbps). ONS 15454 E-Series Example Application and ProvisioningE-Series Ethernet circuits can be used to link E-Series cards in multiple ONS 15454 nodes in point-to-point (private line), hub-and-spoke, or shared packet ring (SPR) configurations. If a connection is needed between only two nodes, a point-to-point connection is typically used. If connectivity is needed among more than two sites, the hub-and-spoke or SPR topology can be used. Figure 7-1 shows an example of a network that uses the shared packet ring configuration. The ring will pass through E-Series cards in the four nodes (A, B, C, and D) on an OC-12 unidirectional path-switched ring (UPSR). In UPSR shared packet ring configurations, Layer 1 SONET protection is not used (Spanning Tree Protocol [STP] only). Figure 7-1. E-Series Ethernet Interface Card Shared Packet Ring Network ExampleTo illustrate an example application of the E-Series cards in an ONS 15454 MSPP network, consider this high-level overview of the steps in setting up a SPR:
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