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Cisco ONS 15454 SDH E1-75 Podręcznik
11.16.5 Open-Ended VCAT
2. For CE-Series cards, you can add or delete members after creating a VCAT circuit with no protection. During the time it
11.16.5 Open-Ended VCAT
For applications where the complete end-to-end VCAT circuit is not in a CTC managed network, CTC
will only see either the source or the destination of the Virtual Concatenated Group (VCG) and some of
the intermediate nodes.
end-to-end VCAT circuit, with VCAT functionality, are referred to as the VCAT-Source and
VCAT-Destination. The termination points of the CTC managed circuit, which is the Open-Ended VCAT
circuit, is referred to as simply the Source and Destination.
Figure 11-13
VCAT-Source
Source
CTC Managed
Network
Open-ended VCAT Circuit
Open-ended VCAT circuits can originate or terminate on any pair of OC-N ports and you can route
open-ended VCAT circuits using any of the cards and ports supported by VCAT. The CTC circuit
creation wizard provides an additional check box in the VCAT attributes pane to enable Open-VCAT
circuit creation. Enabling the check box differentiates open-ended VCAT from regular VCAT Circuits.
The routing preferences for an open-ended VCAT circuit must be specified in the initial stages of circuit
provisioning. For example, if the circuit is independent fiber routing, then multiple OC-N ports can be
involved. Alternatively, the source of an open-VCAT circuit should always be a card capable of
participating in a VCG. This allows CTC to determine which routing preferences are permissible.
11.16.5.1 Open-Ended VCAT Protection
Table 11-15
have different routing preferences.
Cisco ONS 15454 SDH Reference Manual, R8.5
11-30
takes to add or delete members (from seconds to minutes), the entire VCAT circuit will be unable to carry traffic.
Figure 11-13
Open-Ended VCAT
Destination
Destination
End-to-end VCAT Circuit
summarizes the protection options for open-ended VCAT circuits. Note that members can
shows an end-to-end VCAT circuit. The termination points of the
SONET/SDH Port
SONET/SDH Port
Chapter 11 Circuits and Tunnels
VCAT-Destination
Non-CTC Managed
Network
78-18119-01