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Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-07
Chapter 3 Information About Topology
Topology-Related Parameters
Connection Mode Parameter
The connection mode parameter refers directly to the physical topology in which the SCE 2000 is
installed. The connection mode depends on two factors:
•
Inline/Receive-only
:
–
Inline
— The SCE 2000 resides on the data link between the subscriber side and the network
side, thus both receiving and transmitting packets.
–
Receive-only
— The SCE 2000 does not reside physically on the data link. Data is forwarded
to the SCE 2000 via an external switch. The SCE 2000 itself receives only and does not transmit.
•
Cascade
— Indicates a two SCE 2000 topology where the SCE 2000 are connected via the cascade
ports.
The connection mode parameter is determined by the physical deployment of the SCE 2000, as follows:
•
Single SCE 2000
inline installation = “
Inline
” connection mode.
•
Single SCE 2000
optical splitter installation = “
Receive-only
” connection mode.
•
Two SCE 2000 inline installation = “
Inline-cascade
” connection mode.
•
Two SCE 2000
optical splitter installation = “
Receive-only-cascade
” connection mode.
sce-id Parameter
A cascade topology supports two traffic links. In the SCE 2000, this parameter defines which link is
connected to which SCE8000 platform. (The name of the parameter refers to its use in the SCE8000 GBE
platform, for which it actually defines a specific SCE platform. However, in the case of the SCE 2000,
simply specify the number of the physically connected link for this parameter:)
•
Assign a value of 0 or 1
Tip
Alternatively, you can still use the physically-connected-links parameter, which is still supported for
backward compatibility. Assign a value of link-0 or link-1.
Priority
In a cascade topology, the user must define the priority of each SCE 2000.
•
Primary
— The Primary SCE 2000 is active by default
•
Secondary
— The Secondary SCE 2000 is the default standby.
Note that these defaults apply only when both devices are started together. However, if the primary SCE
2000 fails and then recovers, it will not revert to active status, but remains in standby status, while the
secondary device remains active.
