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Cisco ONS 15454 SDH Product Overview, R3.4

September 2002

Cisco ONS 15454 SDH Product Overview

Ethernet

The ONS 15454 SDH integrates Ethernet access into the same SDH platform that

transports voice traffic. Service providers use Ethernet over SDH to augment

TDM services while delivering data traffic over existing facilities. The ONS

15454 SDH supports Layer 2 switching and the ability to classify Ethernet traffic

as defined in the IEEE 802.1 Q-tag standard. You can switch tagged traffic onto

separate SDH VC4 channels to engineer bandwidth by traffic class. The ONS

15454 SDH can also concentrate Ethernet ports into one or more VC4 circuits to

use bandwidth more efficiently.

Note The E-series cards (E100T-G, E1000-2-G) support Layer 2

switching, but the G-series card (G1000-4) does not.

Priority Queuing

Networks without priority queuing handle all packets on a first-in, first-out

(FIFO) basis. Priority queuing, which is supported by the ONS 15454 SDH,

reduces the impact of network congestion by mapping Ethernet traffic to different

priority levels. The ONS 15454 SDH takes the eight priorities specified in IEEE

802.1Q and maps them to two queues. Q-tags carry priority queuing information

through the network.

VLAN Service

The ONS 15454 SDH works with Ethernet devices whether they support IEEE

802.1Q tagging or not. The ONS 15454 SDH supports virtual LANs (VLANs)

that provide private network service across an SDH backbone. You can define

specific Ethernet ports and SDH VC4 channels as a VLAN group. VLAN groups

isolate subscriber traffic from users outside the VLAN group and keep external

traffic from “leaking” into the virtual private network (VPN). Each IEEE 802.1Q

VLAN represents a different logical network.

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Cisco ONS 15454 SDH Especificaciones Pagina 33