Chapter 7 Circuits and Tunnels

Virtual Concatenated Circuits

Note Although LCAS operations are errorless, an SDH error can affect one or more VCAT members. If this occurs, the VCAT Group Degraded (VCG-DEG) alarm is raised. For information about clearing this alarm, refer to the “Alarm Troubleshooting” chapter in the Cisco ONS 15310-MA SDH Troubleshooting Guide.

SW-LCAS is a limited form of LCAS that allows the VCAT circuit to adapt to member failures and keep traffic flowing at a reduced bandwidth. SW-LCAS is necessary when interoperating with the ONS 15454 ML-Series cards. SW-LCAS uses legacy SDH failure indicators like path alarm indication signal (AIS-P) and path remote defect indication (RDI-P) to detect member failure. You can select SW-LCAS during VCAT circuit creation.

In addition, you can create non-LCAS VCAT circuits, which do not use LCAS or SW-LCAS. While LCAS and SW-LCAS member cross-connects can be in different service states, all In Group non-LCAS members must have cross-connects in the same service state. A non-LCAS circuit can mix Out of Group and In Group members if the In Group members are in the same service state. Non-LCAS members do not support the locked-enabled,outOfGroup service state; to put a non-LCAS member in the Out of Group VCAT state, use locked-enabled,disabled.

Note Protection switching for LCAS and non-LCAS VCAT circuits might exceed 60 ms. Traffic loss for VC low-order path VCAT circuits is approximately two times more than traffic loss for a VC high-order path VCAT circuit. You can minimize traffic loss by reducing path differential delay.

7.7.4 VCAT Circuit Size

Table 7-6lists supported VCAT circuit rates and the number of members for each card.

Table 7-6

ONS 15310-MA SDH Card VCAT Circuit Rates and Members

 

 

 

 

 

Card

 

Circuit Rate

Number of Members

 

 

 

 

 

CE-100T-8 1

 

VC12

1–63

 

 

VC3

1-3

 

 

 

 

 

 

ML-100T-8 1

 

VC3

1–2

CE-MR-6

 

VC12

1-63

 

 

 

 

 

 

 

 

VC3

1-21

 

 

 

 

 

 

 

 

VC4

1-7

 

 

 

 

 

 

1.A VCAT circuit with an ONS 15310-MA SDH CE-100T-8 or ML-100T-8 card as a source or destination and an ONS 15454 ML-Series card as a source or destination can have only two members.

Use the Members tab in the Edit Circuit window to add or delete members from a VCAT circuit. The capability to add or delete members depends on whether the VCAT circuit is LCAS, SW-LCAS, or non-LCAS:

For VCAT LCAS circuits, you can add or delete members without affecting service. Before deleting a member, Cisco recommends that you put the member in the locked-enabled,outOfGroup service state.

Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2

7-14

78-19417-01

 

 

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Cisco Systems 15310-MA manual Vcat Circuit Size, Card Circuit Rate Number of Members, VC3 VC4

15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

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