3Com 5500-EI Series, Reference Manual

Page: 951 / 1314

2-12
Description
Use the rmon history command to add an entry to the history control table. If you do not specify the
owner text keyword/argument combination, the owner of the entry is displayed as “null”.
Use the undo rmon history command to remove an entry from the history control table.
You can use the rmon history command to sample a specific port. You can also set the sampling
interval and the number of the samples that can be saved. After you execute this command, the RMON
system samples the port periodically and stores the samples for later retrieval. The sampled information
includes utilization, the number of errors, and total number of packets.
You can use the display rmon history command to display the statistics of the history control table.
Examples
# Create the history control entry numbered 1 for Ethernet 1/0/1, with the table size being 10, the
sampling interval being 5 seconds, and the owner being user1 .
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname]interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1]rmon history 1 buckets 10 interval 5 owner user1
# Remove the history control entry numbered 15.
[Sysname-Ethernet1/0/1] undo rmon history 15
rmon prialarm
Syntax
rmon prialarm entry-number prialarm-formula prialarm-des sampling-timer { delta | absolute |
changeratio } rising_threshold threshold-value1 event-entry1 falling_threshold threshold-value2
event-entry2 entrytype { forever | cycle cycle-period } [ owner text ]
undo rmon prialarm entry - number
View
System view
Parameters
entry - number : Extended alarm entry index, in the range 1 to 65535.
prialarm-formula : Expression used to perform operations on the alarm variables, a string of 1 to 256
characters. The alarm variables in the expression must be represented by OIDs, for example,
(.1.3.6.1.2.1.2.1.10.1)*8. The operations available are addition, subtraction, multiplication and division
operations. The operation results are rounded to values that are of long integer type. To prevent invalid
operation results, make sure the operation results of each step are valid long integers.
prialarm-des : Alarm description, a string of 1 to 128 characters.
sampling - timer : Sampling interval (in seconds), in the range 10 to 65535.
delta | absolute | changeratio : Specifies the sample type.
threshold - value1 : Upper threshold, in the range 0 to 2147483647.
event - entry1 : Index of the event entry that corresponds to the rising threshold, in the range 0 to 65535.