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Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-07
Chapter 3 Information About Topology
Information About Topology Considerations
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
SCE Platform Dual Link Receive-Only Topology
Note
When implementing receive-only topologies with a switch, the switch must support SPAN functionality
that includes separation between ingress and egress traffic and multiple SPAN-ports destinations.
LINK RX
Cisco SCE 2000
Series
4xGBE
TX
RX
MM
TX
LINK RX TX
RX
MM
TX
LINK RX TX
RX
MM
TX
LINK RX TX
RX
MM
TX
GBE-1
SUB
LINE
NET
PWR B
STATUS
PWR A
BYPASS
GBE-2
SUB LINE/CASCADE NET
Router
Optical
splitter
Router
Subscriber
92797
Network
Router
Optical
splitter
Link 1
Link 2
Router
Subscriber
Network