Cisco Systems ONS 15327 Line Cards, BLSR Functionality, DDTS # CSCdt30119, DDTS # CSCdt50628

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