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Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-07
Chapter 3 Information About Topology
Information About Topology Considerations
Figure 3-5
Two SCE Platforms: Dual Link Inline Topology
This fail-over solution preserves the SCE 2000 functionality and the network link:
•
The two SCE 2000s are simultaneously aware of the subscriber contexts, and subscriber states are
constantly exchanged between them, such that if the primary SCE 2000 fails, the secondary can take
over with minimum state loss.
•
When one SCE 2000 fails (depending on the type of failure) its link traffic is still bypassed to the
functioning SCE 2000 and processed there, so the traffic processing continues for both the links.
•
The bypass of the traffic through the failed SCE 2000 is configurable, and the user may choose to
always cutoff the line that goes through the failed SCE 2000. In this case network redundancy
protocols like HSRP are responsible for identifying the line cutoff and switching all the traffic to go
through the functioning SCE 2000.
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
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
Link 1
Router
Subscriber
Network
Link 2
Router
Router
Subscriber
Network
92800
