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Cisco ONS 15600 SDH Reference Manual, Release 9.0
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Chapter 7 Circuits and Tunnels
7.15 Reconfigured Circuits
7.15 Reconfigured Circuits
You can reconfigure multiple circuits, which is typically necessary when a large number of circuits are
in the PARTIAL status. When you reconfigure multiple circuits, the selected circuits can be any
combination of DISCOVERED, PARTIAL, DISCOVERED_TL1, and PARTIAL_TL1 circuits. You can
reconfigure tunnels, 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
PARTIAL tunnel circuits do not split into multiple circuits during reconfiguration.
7.16 Server Trails
A server trail is a non-DCC (logical or virtual) link across a third-party network that connects two CTC
network domains. A server trail allows A-Z circuit provisioning when no DCC is available. You can
create server trails between two distant optical or STM-1E ports. The end ports on a server trail can be
different types (for example, an STM-4 port can be linked to an STM-1 port). Server trails are not
allowed on DCC-enabled ports.
The server trail link is bidirectional and can be VC3, VC11, VC12, VC4, VC4-2c, VC4-3c, VC4-4c,
VC4-6c, VC4-8c, VC4-12c, VC4-16c, VC4-32c, and VC4-64c; you cannot change an existing server
trail to another size. It must be deleted and recreated. A circuit provisioned over a server trail must match
the type and size of the server trail it uses. For example, an VC4-3c server trail can carry only VC4-3c
circuits and not three VC4 circuits.
Note
There is no OSPF or any other management information exchange between NEs over a server trail.
7.16.1 Server Trail Protection Types
The server trail protection type determines the protection type for any circuits that traverse it. A server
trail link can be one of the following protection types:
•
Preemptible—PCA circuits will use server trails with the Preemptible attribute.
•
Unprotected—In Unprotected Server Trail, CTC assumes that the circuits going out from that
specific port will not be protected by provider network and will look for a secondary path from
source to destination if you are creating a protected circuit.
•
Fully Protected—In Fully Protected Server Trail, CTC assumes that the circuits going out from that
specific port will be protected by provider network and will not look for a secondary path from
source to destination.
Note
Only SNCP protection is available on server trails. MS-SPRing procection is not available on server trail.
