Line Cards - Cisco ONS 15327 Manual

Caveats
DDTS # CSCdt30119
VT1.5 circuits might require new VT tunnels despite sufficient bandwidth on existing VT tunnels. In
complex configurations of the Cisco ONS 15327 that use both 1+1 and UPSR protection, automatic
circuit routing may fail to use existing VT tunnels. When you create new VT1.5 circuits with automatic
circuit routing, the ONS 15327 might prompt you to create new VT tunnels even though sufficient
bandwidth is available in existing VT tunnels. Use manual routing to specify a path for the VT1.5 circuit
through the existing VT tunnels. This issue will be resolved in a future release.

Line Cards

DDTS # CSCdt50628
B3 errors might appear on an OC-12 span after an XTC side switch. A one-time burst of B3 errors might
occur after an XTC side switch when the ONS 15327 is configured with an OC-12 line card. This is a
rare condition which has been seen in approximately 1% of such XTC side switches. The result is less
than 1 errored second. No traffic outage is associated with this burst of B3 errors. The issue only arises
with OC-12 configurations. OC-48 configurations are not affected. This issue will be resolved in a future
release.
BLSR Functionality
DDTS # CSCdw64086
For a given BLSR node equipped with two XTCs or two TCCs, say Node 1, if you back up the database,
change the node ID of any of the other nodes in the ring, and then restore the database for Node 1,
following completion of the database restoral, a node ID mismatch condition will exist. However, the
node ID mismatch alarm may not be raised to warn you that BLSR will not function properly. If this
occurs, after the database restoral has completed, you can change the local node's Node ID (you can then
change it back to the previous ID if you prefer) to restore functionality of the BLSR (and clear the alarm,
if it is raised). If you perform a database restoral on a BLSR node, always verify afterwards that all nodes
in the ring have the correct ring map. This will ensure that any such issue for which an alarm is not raised
can be found and corrected. This issue will be resolved in Release 3.4.
DDTS # CSCdw66416
Traffic along a running ring segment cannot be restored while a participating node is rebooting. To see
this problem, in a two fiber BLSR with circuits created along a given ring segment, you must isolate that
ring segment by powering down two or more nodes where one of the nodes powered down is at the edge
of the segment and the others are outside of the segment. Then power up and reboot the node at the edge
of the segment. The circuits along this segment will not be restored even though the nodes on the
segment are both up and running. You must restore power to all nodes before the traffic is restored.
Release Notes for Cisco ONS 15327 Release 3.3
4
OL-2671-01