Troubleshooting guide

13
Special Considerations
LSCle00962 PVC
The deleted PVC cannot be added in again: “Waiting to be deleted from switch.”
The current implementation restriction requires that, after initiating a download, the user wait until
the download completes before trying to modify the records involved in the download. Further, the
user needs to reread the database after the download completes before modifying the records.
LSCle01015 Config Files
Fallback from swchgver does not copy config files back.
LightStream 2020 configuration information is stored on disk as part of a specific release.
Configuration information from an old release is copied forward to a new release as part of
installation of the new release. Configuration information, however, is not automatically copied
between releases when swchgver is used to change the current release.
Take, for example, the situation where a node is upgraded to run new software and, after the upgrade,
configuration changes are made. If the node is then downgraded to a previous release, the node runs
with the configuration information that was cached at the time of the upgrade, not the changes that
were made after the upgrade.
After falling back to an old version, the current configuration cache can be downloaded to the node
to set the newest configuration.
Alternatively, before falling back to an old version, the files in /usr/app/base-newrel/config can be
copied to /usr/app/base-oldrel/config (replace newrel and oldrel with the appropriate release
numbers, such as 2.0.8 and 2.0.7).
LSCle01044 External Bridge Loops
External bridge loops cause loss of VLI functionality.
When configuring LightStream 2020 nodes with external topology loops, configure the bridge
priority for the nodes to make one node the spanning-tree root.
LSCle01068 Rate Statistics
The rate information produced by the CLI when displaying port statistics is not accurate.
LSCle01096 ATM UTI and FF Ports
An ATM UNI or FF port reports operationally up when disconnected.
Currently, the frame forwarding and ATM-UNI interfaces cannot report their actual operational
status. This is because these interfaces do not provide a link-level reliability indication (such as the
LMI for FR or Trunk-Up-Down (TUD) for LightStream 2020 trunks). The operational status on
these ports is always the same as the administrative status of the port. The operational status does
not indicate physical layer or data-link layer status.
LSCle01141 Abort Download
Request a way to abort an unwanted download.
Currently, there is no function for aborting long downloads. However, it is possible to abort
downloads with the UNIX kill command. Use the command ps ax to find the process ID (PID) of
each cfg_a process. Do not kill the cfg_a process with the lowest PID, because it is the parent cfg_a
process. Any cfg_a process with a higher PID is a child process, which you may kill. If more than