Cisco SFE2000P Installation And Configuration Manual page 35

Chapter 3 Information About Topology
In case the primary SCE 2000 fails, the two SCE 2000 s switch their roles, and this way fail-over is
provided.
Figure 3-5
Subscriber
PWR A PWR B STATUS
PWR A PWR B STATUS
Subscriber
This fail-over solution preserves the SCE 2000 functionality and the network link:
The two SCE 2000 s 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 .
OL-7824-06
Two SCE Platforms: Dual Link Inline Topology
Router
Link 1
BYPASS
LINK RX TX
RX MM TX RX
GBE-1
SUB LINE NET
BYPASS
LINK RX TX
RX MM TX RX
GBE-1
SUB LINE NET
Link 2
Router
Router
Cisco SCE 2000
LINK RX TX LINK RX TX
MM TX RX MM TX
GBE-2
SUB LINE/CASCADE NET
Cisco SCE 2000
LINK RX TX LINK RX TX
MM TX RX MM TX
GBE-2
SUB LINE/CASCADE NET
Router
Cisco SCE 2000 4xGBE Installation and Configuration Guide
Information About Topology Considerations
Network
Series
4xGBE
LINK RX TX
RX MM TX
Series
4xGBE
LINK RX TX
RX MM TX
Network
3-9