Cisco SCE 1000 2xGBE User's Guide download pdf (Page 44)

Chapter 2 Topology

Topology-Related Parameters

SCE 1000 2xGBE Release 2.0.10 User Guide

2-8 OL-7117-02

Connection Mode Parameter

The connection mode parameter refers directly to the physical topology in which the SCE 1000 is

installed. Installation is possible in either of the two following modes:

• Inline: The SCE 1000 resides on the data link between the subscriber side and the network

side, thus both receiving and transmitting packets.

• Receive-only: The SCE 1000 does not reside physically on the data link. Data is forwarded to

the SCE 1000 via an external optical splitter. The SCE 1000 itself receives only and does not

transmit.

Note

Default value = Inline

The connection mode parameter is determined by the physical deployment of the SCE 1000 as

follows:

• Bump-in-the-wire installation = Inline connection mode.

• External optical splitter installation = Receive-only connection mode.

On-Failure Mode Parameter

As described in the section The Bypass Mechanism, the bypass card supports four different

modes. The following two modes are possible when the SCE 1000 is not operational due to

platform failure or boot:

• Bypass: The optical splitter forwards traffic with no intervention of the control application

running in the SCE 1000 platform, but monitoring functions continue uninterrupted.

• Cutoff: There is no forwarding of traffic. The link is forced down, resulting in traffic cutoff at

Layer1.

The Forwarding mode enables control of traffic flow and is not compatible with the non-

operational status.

In a single SCE 1000 topology, the value of this parameter is determined by whether or not the

link can be completely cut when the SCE 1000 fails, or whether traffic flow should continue

across the link in spite of platform failure.

• Cutoff mode is required for the following:

• Redundant bump-in-the-wire topology.

• Non-redundant bump-in-the-wire topology if value-added services are crucial and are

more important than maintaining connectivity.

• Bypass mode is required for the following:

• Non-redundant bump-in-the-wire topology if connectivity is crucial.

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Cisco SCE 1000 2xGBE User's Guide Page 44