Cisco SCE 2000 4xGBE Installation And Configuration Manual page 35

Chapter 3 Topology
Dual Link: Receive-Only Topology
In this topology, one SCE 2000 is connected in receive-only mode to two full duplex, GBE links
using optical splitters. If the two links are load-shared, asymmetrical routing might occur, and
some of the flows may be split, i.e. the upstream packets of the flow go on one link, and the
downstream packets go on the other link.
When installed in this topology, the SCE 2000 completely overcomes this phenomenon, and
provides its normal monitoring functionality as if asymmetrical routing were not occurring in the
two links.
This installation supports monitoring functionality only, and is configured as "receive-only"
connection mode.
Figure 3-4: Single SCE Platform Dual Link Receive-Only Topology
When implementing receive-only topologies with a switch, the switch must support SPAN functionality
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that includes separation between ingress and egress traffic and multiple SPAN-ports destinations.
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Cisco SCE 2000 4xGBE Installation and Configuration Guide
Physical Topologies
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