Cisco CX-FEIP-2TX= Installation and con?guration Specifications Page 345

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9-5
Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
Chapter 9 Ethernet Operation
G1000-4 Card
the G1000-4. The G1000-4 supports Gigabit EtherChannel (GEC), which is a Cisco proprietary standard
similar to the IEEE link aggregation standard (IEEE 802.3ad). Figure 9-3 illustrates G1000-4 GEC
support.
Figure 9-3 G1000-4 Gigabit EtherChannel (GEC) support
Although the G1000-4 card does not actively run GEC, it supports the end-to-end GEC functionality of
attached Ethernet devices. If two Ethernet devices running GEC connect through G1000-4 cards to an
ONS 15454 network, the ONS 15454 SONET side network is transparent to the EtherChannel devices.
The EtherChannel devices operate as if they are directly connected to each other. Any combination of
G1000-4 parallel circuit sizes can be used to support GEC throughput.
GEC provides line-level active redundancy and protection (1:1) for attached Ethernet equipment. It can
also bundle parallel G1000-4 data links together to provide more aggregated bandwidth. Spanning Tree
(STP) operates as if the bundled links are one link and permits GEC to utilize these multiple parallel
paths. Without GEC, STP only permits a single non-blocked path. GEC can also provide G1000-4
card-level protection or redundancy because it can support a group of ports on different cards (or
different nodes) so that if one port or card has a failure, then traffic is re-routed over the other port/card.
9.1.5 G1000-4 LEDs
G1000-4 series Ethernet card faceplates have two card-level LEDs and one bicolored LED next to each
port.
67833
SONET
/SDH Circuits
Gigabit EtherChannel
Gigabit EtherChannel
ONS Node
ONS Node
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