Troubleshooting guide

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Release Notes for Cisco ONS 15454 Release 7.0.2
OL-11368-01
New Features and Functionality
The server trail link is bidirectional and can be VT1.5, VT2, STS1, STS-3c, STS-6c, STS-12c, STS-48c,
or STS-192c; 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
can also route circuits over server trail links during automatic routing. VCAT common-fiber automatic
routing is not supported.
BLSR STS and VT Squelching
Release 7.0.x supports BLSR STS squelching for the ONS 15454, ONS 15327, and ONS 15600, and VT
squelching for the ONS 15454, and ONS 15327, with limited VT squelching support (see below)
provided by the ONS 15600. STS-level squelching is supported in previous releases. With VT-level
squelching added in Release 7.0.x the STS squelch table now displays VT-access status for each STS
(every entry) in the table. There is a check box in both the east and west sides for each entry of STS
squelch table, and a check mark in this box indicates that the STS is VT-access.
Release 7.0.x nodes display STS and VT squelch tables depending on the type of circuits created. For
example, if a fiber cut occurs, the BLSR squelch tables show STSs or VTs that will be squelched for
every isolated node. Squelching replaces traffic by inserting the appropriate alarm indication signal path
(AIS-P) and prevents traffic misconnections. For an STS with a VT-access check mark, the AIS-P will
be removed after 100 ms.
BLSR STS Squelch Tables in CTC
BLSR STS squelch tables show STSs that will be squelched for every isolated node. BLSR STS
numbers, East and West source and destination information, and East and West incoming, or outgoing
VT access indications are displayed in the BLSR Squelch Table window. BLSR squelching is performed
on STSs that carry STS circuits only. Squelch table entries will not appear for STSs carrying VT circuits
or Ethernet circuits to, or from E-Series Ethernet cards provisioned in a multicard Ethergroup. These
squelch tables contain entries with adjacent node IDs displayed, instead of source or destination node
IDs.
BLSR VT Squelch Tables in CTC
BLSR VT squelch tables only appear on the node dropping VTs from a BLSR and are used to perform
VT-level squelching when a node is isolated. VT squelching is supported on the ONS 15454 and the ONS
15327 platforms. The ONS 15600 platform does not support VT squelching; however, when an ONS
15454 and an ONS 15600 are in the same network, the ONS 15600 node allows the ONS 15454 node to
carry VT circuits in a VT tunnel. The ONS 15600 performs 100-ms STS-level squelching for each
VT-access STS at the switching node in case of a node failure.
When using a VT circuit on a VT tunnel (VTT), or on a VT aggregation point (VAP), the VTT or VAP
allows multiple VT circuits to be passed through on a single STS without consuming VT matrix
resources on the cross-connect card.
In case of a source and destination node failure of a VTT, the switching node performs 100-ms STS-level
squelching for the VTT STS. The node dropping VT traffic performs VT-level squelching. VT traffic on
the VTT that is not coming from the failed node is protected.