Cisco ONS 15454 Series, Procedure Manual

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Cisco ONS 15454 Procedure Guide, R5.0
August 2005
Chapter 6 Create Circuits and VT Tunnels
NTP-A264 Create an Automatically Routed VCAT Circuit
•
Mode—Choose the protection mode for the VCAT circuit:
– None—Provides no protection. A failure on one member causes the entire VCAT circuit to fail.
For CE-100T-8 cards, you can add or delete members after creating a VCAT circuit with no
protection. During the time it takes to add or delete members (from seconds to minutes), the
entire VCAT circuit will be unable to carry traffic. For all other cards, you cannot add or delete
members if the protection mode is None.
–
Sw-LCAS—(Software - Link Capacity Adjustment Scheme [LCAS]) Allows the VCAT circuit
to adapt to member failures and keep traffic flowing after failures at a reduced bandwidth.
Sw-LCAS uses legacy SONET failure indicators like AIS-P and RDI-P to detect member
failure.
– LCAS—Sets the VCAT circuit to use Link Capacity Adjustment Scheme (LCAS). With LCAS,
you can add or delete members without interrupting the operation of non-involved members,
and if a member fails, LCAS temporarily removes the failed member from the VCAT circuit.
The remaining members carry the traffic until the failure clears.
Note
Cisco recommends using LCAS for CE-T100-8 cards that do not need to interoperate with
the ML-Series cards.
Figure 6-17 Setting VCAT Circuit Attributes
Step 7
Click Next .
Step 8 Complete the “DLP-A324 Provision a VCAT Circuit Source and Destination” task on page 20-14 for the
VCAT circuit you are creating.
Step 9
In the VCAT Circuit Routing Preferences area ( Figure 6-18 ), check Route Automatically . Two options
are available; choose either, both, or none based on your preferences.
•
Using Required Nodes/Spans—Check this check box to specify nodes and spans to include or
exclude in the CTC-generated circuit route.
Including nodes and spans for a circuit ensures that those nodes and spans are in the working path
of the circuit (but not the protect path). Excluding nodes and spans ensures that the nodes and spans
are not in the working or protect path of the circuit.
•
Review Route Before Creation—Check this check box to review and edit the circuit route before the
circuit is created.