Datasheet

11-34
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 11 Circuits and Tunnels
11.18 Reconfigured Circuits
11.18 Reconfigured Circuits
You can reconfigure multiple circuits, which is typically necessary when a large number of circuits are
in the PARTIAL state. When reconfiguring multiple circuits, the selected circuits can be any
combination of DISCOVERED, PARTIAL, DISCOVERED_TL1, or PARTIAL_TL1 circuits. You can
reconfigure VCTs, VCA circuits, VLAN-assigned circuits, VCAT circuits, CTC-created circuits, and
TL1-created circuits. The Reconfigure command maintains the names of the original cross-connects.
Use the CTC Tools > Circuits > Reconfigure Circuits command to reconfigure selected circuits. During
reconfiguration, CTC reassembles all connections of the selected circuits into circuits based on path size,
direction, and alignment. Some circuits might merge and others might split into multiple circuits. If the
resulting circuit is a valid circuit, it appears as a DISCOVERED circuit. Otherwise, the circuit appears
as a PARTIAL or PARTIAL_TL1 circuit.
Note If CTC cannot reconfigure all members in a VCAT circuit, the reconfigure operation fails for the entire
VCAT circuit and it remains in the PARTIAL or PARTIAL_TL1 status. If CTC does reconfigure all
members in a VCAT circuit, the VCAT circuit may still remain in the PARTIAL or PARTIAL_TL1
status. This occurs if the ports defined in the VCAT termination do not match the source/drop ports of
the member circuits or if one or two VCAT terminations are missing.
Note PARTIAL tunnel and PARTIAL VLAN-capable circuits do not split into multiple circuits during
reconfiguration.
11.19 Server Trails
A server trail is a non-DCC link across a third-party network that connects two CTC network domains.
A server trail allows circuit provisioning when no DCC is available. You can create server trails between
any two STM-N ports. Server trails are not allowed on DCC-enabled ports.
The server trail link is bidirectional and can be VC4-2c, VC4-3c, VC4-4c, VC4-6c, VC4-8c, VC4-12c,
VC4-16c, VC4-64c, VC4, VC3, VC12, or VC11; you cannot upgrade an existing server trail to another
size. A server trail link can be one of the following protection types: Preemptible, Unprotected, and Fully
Protected. The server trail protection type determines the protection type for any circuits that traverse it.
PCA circuits will use server trails with the Preemptible attribute.
When creating circuits or VCATs, you can choose a server trail link during manual circuit routing. CTC
may also route circuits over server trail links during automatic routing. VCAT common-fiber automatic
routing is not supported.