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NTP- D283 Create an Automatically Routed VCAT Circuit
Define the circuit attributes
Step 7
Name—Assign a name to the circuit. The name can be alphanumeric and up to 48 characters
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(including spaces). Circuit names should be 44 characters or less if you want the ability to create
monitor circuits. If you leave the field blank, CTC assigns a default name to the circuit.
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Type—Displays the circuit type you chose in
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Bidirectional—Checked is the default. You cannot change it.
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Create cross-connects only (TL1-like)—Check this check box if you want to create one or more
cross-connects to complete a signal path for TL1-generated circuits. If you check this box, low-order
tunnels and Ethergroup sources and destinations are unavailable.
State—Choose Unlocked.
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Apply to drop ports—Check this check box to apply the IS administrative state to the circuit source
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and destination ports. CTC applies the administrative state to the ports only if the circuit bandwidth
is the same as the port bandwidth or, if the port bandwidth is larger than the circuit, the circuit must
be the first circuit to use the port. If not, a Warning dialog box shows the ports where the
administrative state could not be applied. If the check box is unchecked, CTC does not change the
service state of the source and destination ports.
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Symmetric—Checked is the default. You cannot change it.
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Member size—Choose the member size. For information about the member size supported for each
card, refer to the "Circuits and Tunnels" chapter in the Cisco ONS 15454 SDH Reference Manual.
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Num. of members—Choose the number of members. For information about the number of members
supported for each card, refer to the "Circuits and Tunnels" chapter in the Cisco ONS 15454 SDH
Reference Manual.
Mode—Choose the protection mode for the VCAT circuit:
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Cisco ONS 15454 SDH Procedure Guide, R7.0
6-98
(Figure 6-13 on page
None—Provides no protection. A failure on one member causes the entire VCAT circuit to fail.
You cannot delete members after creating a VCAT circuit with no protection.
SW-LCAS—(Software link capacity adjustment scheme) Allows the VCAT circuit to adapt to
member failures and keep traffic flowing after failures at a reduced bandwidth. SW-LCAS
provides interoperability with the ML-Series cards. SW-LCAS uses legacy SONET failure
indicators like path alarm indication signal (AIS-P) and path remote defect indication (RDI-P)
to detect member failure. You cannot add or delete members from a VCAT circuit with
SW-LCAS protection.
LCAS—Sets the VCAT circuit to use LCAS. With LCAS, you can add or delete members
without interrupting the operation of uninvolved members. If a member fails, LCAS temporarily
removes the failed member from the VCAT circuit. The remaining members carry the traffic
until the failure clears.
Chapter 6
Create Circuits and Low-Order Tunnels
6-99):
Step
5. You cannot change it.
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