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Chapter 3 Topology

Physical Topologies

Cisco SCE 2000 4/8xFE Installation and Configuration Guide

OL-7826-05 3-9

SCE 2000 Configuration

There are four topology-related parameters:

• Connection mode — Can be any one of the following, depending on the physical installation

of the SCE 2000 (Refer to Connection Mode Parameter (on page 3-9)):

• Inline — single SCE 2000 inline

• Receive-only — single SCE 2000 receive-only

• Inline-cascade — two SCE 2000s inline

• Receive-only-cascade — two SCE 2000s receive-only

• Physically-connected-links — In cascaded configurations, this parameter defines the number

of the link connected to this SCE 2000 (Refer to Physically Connected Links Parameter (on

page 3-10)).

It is applicable only in a cascade topology.

• Priority — This parameter defines which is the primary SCE 2000 (Refer to Priority (on

page 3-10)).

It is applicable only in a cascade topology.

• On-failure — This parameter determines whether the system cuts the traffic or bypasses it

when the SCE 2000 either has failed or is booting. It is not applicable to receive-only

topologies (Refer to On-Failure Mode Parameter (on page 3-10)).

Any of these parameters may be configured via either the setup command or the

connection-mode command.

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 2000s 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 external switch installation = “Receive-only” connection mode.

• Two SCE 2000 inline installation = “Inline-cascade” connection mode.

• Two SCE 2000 external switch installation = “Receive-only-cascade” connection mode.

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Cisco Systems 4/8xFE Guía de usuario Pagina 35