10-5
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter10 Circuits and Tunnels
10.2.2 Circuit States
10.2.2 Circuit States
The circuit service state is an aggregate of the cross-connect states within the circuit.
•If all cross-connects in a circuit are in the Unlocked-enabled service state, the circuit service state
is Unlocked.
PARTIAL A CTC-created circuit is missing a cross-connect or network
span, a complete path from source to destination(s) does not
exist, or an alarm interface panel (AIP) change occurred on
one of the circuit nodes and the circuit is in need of repa ir.
(AIPs store the node MAC address.)
In CTC, circuits are represented using cross-connects and
network spans. If a network span is missing from a circuit,
the circuit status is PARTIAL. However, a PARTIAL status
does not necessarily mean a circuit traffic failure has
occurred, because traffic might flow on a protect path.
Network spans are in one of two states: up or down. On CTC
circuit and network maps, up spans appear as green lines,
and down spans appear as gray lines. If a failure occurs on a
network span during a CTC session, the span remains on the
network map but its color changes to gray to indicate that the
span is down. If you restart your CTC session while the
failure is active, the new CTC session cannot discover the
span and its span line does not appear on the network map.
Subsequently, circuits routed on a network span that goes
down appear as DISCOVERED during the current CTC
session, but appear as PARTIAL to users who log in after the
span failure.
DISCOVERED_TL1 A TL1-created circuit or a TL1-like, CTC-created circuit is
complete. A complete path from source to destination(s)
exists.
PARTIAL_TL1 A TL1-created circuit or a TL1-like, CTC-created circuit is
missing a cross-connect or circuit span (network link), and a
complete path from source to destination(s) does not exist.
CONVERSION_PENDING An existing circuit in a topology upgrade is set to this state.
The circuit returns to the DISCOVERED status once the
in-service topology upgrade is complete. For more
information about in-service topology upgrades, see
Chapter 11, “SDH Topologies and Upgrades.”
PENDING_MERGE Any new circuits created to represent an alternate path in a
topology upgrade are set to this status to indicate that it is a
temporary circuit. These circuits can be deleted if an
in-service topology upgrade fails. For more information
about in-service topology upgrades, see Chapter 11, “SDH
Topologies and Upgrades.”
Table10-1 ONS15454 SDH Circuit Status (continued)
Status Definition/Activity