Cabletron Systems SmartSTACK ETHERNET ELS10-27, User Manual

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Monitoring and Managing Your SmartSTACK Ethernet ELS10-27
4-5
You are, when creating entries in these groups, under no obligation to
make sure they are in chronological order. However, to make the output
display more readable they should be in chronological order. This means,
when the entries for the groups are created or restored they should be
made into some type of linked list, so new entries can be placed where
they are needed to make a more understandable or readable output.
Whenever a request to create or modify a group entry is accepted, a ten
minute timer will be set. If the entry is not completely updated (status set
to VALID) when the timer goes off, the group entry is ßushed. As soon as
the entry is validated and the status set to VALID, the above set timer is
canceled. This step is done to ensure that memory and nonvolatile
memory do not get Þlled with entries that cannot be used.
Modifying Any Group Entry
Entries in the above mentioned groups cannot be modiÞed (even if the
access is read/write) unless the status is set to something other than
VALID. This means you must go through a three step process to modify a
group entry.
1. Send a set command to set the status of a given group entry to
UNDER_CREATION.
2. Send set commands to modify all other needed values in this entry.
3. Send a set command to change the status of the given entry back to
VALID.
When a set status to VALID request is received, the message must be
checked for other set requests for this group entry. If any are found, they
must be processed before the set status to VALID request or they will be
returned as an error. This must be done because it cannot be guaranteed
that the set status to VALID command will be the last command in the
message. It is possible for it to come Þrst followed by all other requests.
When the set status to VALID request is being processed the entire group
entry must be validated and appropriate action taken to return an error or
success. If an error is found the error_status Þeld should be set to
BAD_VALUE and the error_index Þeld should be set to point to the Þrst
offending entry. If no error is found the status of the entry is set to VALID,
the clean up timer is canceled, and the group entry is stored in
nonvolatile memory.