Cisco SCE 2000 Installation And Configuration Manual page 38

Information About Topology Considerations
Figure 3-5
Subscriber
PWR A
PWR A
Subscriber
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.
Cisco SCE 2000 4xGBE Installation and Configuration Guide
3-10
Two SCE Platforms: Dual Link Inline Topology
Router
PWR B STATUS BYPASS
LINK RX TX
RX MM
SUB
PWR B STATUS BYPASS
LINK RX TX
RX MM
SUB
Router
Link 1
LINK RX TX LINK RX TX
TX RX MM TX RX MM
GBE-1
LINE NET SUB LINE/CASCADE NET
LINK RX TX LINK RX TX
TX RX MM TX RX MM
GBE-1
LINE NET SUB LINE/CASCADE NET
Link 2
Chapter 3 Information About Topology
Router
Network
Cisco SCE 2000
Series
4xGBE
LINK RX TX
TX RX MM TX
GBE-2
Cisco SCE 2000
Series
4xGBE
LINK RX TX
TX RX MM TX
GBE-2
Network
Router
OL-7824-07