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Cisco ONS 15454 Reference Manual, R7.0
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Chapter 11 Circuits and Tunnels
11.1 11.1 Overview
• 11.20 Reconfigured Circuits, page 11-43
• 11.21 VLAN Management, page 11-44
• 11.22 Server Trails, page 11-44
11.1 Overview
You can create circuits across and within ONS 15454 nodes and assign different attributes to circuits.
For example, you can:
• Create one-way, two-way (bidirectional), or broadcast circuits.
• Assign user-defined names to circuits.
• Assign different circuit sizes.
• Automatically or manually route circuits.
• Automatically create multiple circuits with autoranging. VT tunnels do not use autoranging.
• Provide full protection to the circuit path.
• Provide only protected sources and destinations for circuits.
• Define a secondary circuit source or destination that allows you to interoperate an ONS 15454 path
protection with third-party equipment path protection configurations.
• Set path protection circuits as revertive or nonrevertive.
You can provision circuits at either of the following points:
• Before cards are installed. The ONS 15454 allows you to provision slots and circuits before
installing the traffic cards.
• After you preprovision the Small Form-factor Pluggables (SFPs) (also called provisionable port
modules [PPMs]).
• After cards and SFPs are installed and ports are in service. Circuits do not actually carry traffic until
the cards and SFPs are installed and the ports are In-Service and Normal (IS-NR); Out-of-Service
and Autonomous, Automatic In-Service (OO-AU,AINS); or Out-of-Service and
Management, Maintenance (OOS-MA,MT). Circuits carry traffic as soon as the signal is received.
11.2 Circuit Properties
The ONS 15454 Cisco Transport Controller (CTC) Circuits window, which appears in network, node,
and card view, is where you can view information about circuits. The Circuits window (Figure 11-1)
provides the following information:
• Name—The name of the circuit. The circuit name can be manually assigned or automatically
generated.
• Type—The circuit types are STS (STS circuit), VT (VT circuit), VTT (VT tunnel), VAP (VT
aggregation point), OCHNC (dense wavelength division multiplexing [DWDM] optical channel
network connection; refer to the Cisco ONS 15454 DWDM Installation and Operations Guide),
STS-V (STS VCAT circuit), or VT-V (VT VCAT circuit).
• Size—The circuit size. VT circuits are 1.5. STS circuit sizes are 1, 3c, 6c, 9c, 12c, 24c, 36c, 48c,
and 192c. OCHNC sizes are Equipped non specific, Multi-rate, 2.5 Gbps No FEC (forward error
correction), 2.5 Gbps FEC, 10 Gbps No FEC, and 10 Gbps FEC (OCHNC is DWDM only; refer to