Cisco ONS 15310-MA SDH Procedure Manual page 180

Before You Begin
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
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card, refer to the "Circuits and Tunnels" chapter in the Cisco ONS 15310-MA SDH Reference
Manual.
• 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 15310-MA
SDH Reference Manual.
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• Mode—Choose the protection mode for the VCAT circuit:
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Click Next.
Step 8
Cisco ONS 15310-MA SDH Procedure Guide, Release 9.1 and Release 9.2
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When creating open-ended VCAT circuits the number of members must be the same on each
side of the virtual concatenated group (VCG). The configuration with different number of
members on each side of circuit is not supported. This is applicable to circuits created on
CE-Series and ML-Series cards.
None—Provides no protection. A failure on one member causes the entire VCAT circuit to fail.
For CE-100T-8 and CE-MR-6 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 ML-100T-8 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 provides interoperability with the ONS 15454 ML-Series cards. Sw-LCAS uses
legacy SDH failure indicators like AIS-P and RDI-P to detect member failure. You cannot add
or delete members from a VCAT circuit with Sw-LCAS protection.
While deleting SW-LCAS circuit members change the administrative state of the members
to Locked,disabled. This is applicable to circuits created on CE-Series and ML-Series cards.
LCAS—Sets the VCAT circuit to use LCAS. With LCAS, you can add or delete members
without interrupting the operation of noninvolved 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.
Cisco recommends using LCAS mode for CE-100T-8 and ML-100T-8 cards that do not need
to interoperate with the ONS 15454 ML-Series cards.
For the CE-MR-10 card, before you create a VCAT circuit in the LCAS protection mode, it
is recommended that you move all members of the VCAT circuit being created to
Locked,OutOfGroup service state and then move them to Unlocked state.
While deleting HW-LCAS circuit members change the administrative state of the members
to Locked, OutOfGroup. This is applicable to circuits created on CE-Series and ML-Series
cards.
Chapter 5 Create Circuits and VC Low-order Path Tunnels
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