To Next Page

To Previous Page

224

Usage guidelines

You can create a maximum of 50 private alarm entries.

Each alarm entry must have a unique alarm variable, sampling interval, sample type, rising threshold, or

falling threshold. You cannot create an alarm entry if all these parameters for the entry are the same as

an existing entry.

To trigger the event associated with an alarm condition, you must create the event with the rmon event

command.

The RMON agent samples variables and takes an alarm action based on a private alarm entry as

follows:

1. Periodically samples the variables specified in the private alarm formula.

2. Processes the sampled values with the formula.

3. Compares the calculation result with the predefined thresholds, and then takes one of the following

actions:

{ Triggers the event associated with the rising alarm event if the result is equal to or greater than

the rising threshold.

{ Triggers the event associated with the falling alarm event if the result is equal to or less than the

falling threshold.

Examples

# Add a permanent private alarm entry to monitor the ratio of incoming broadcasts to the total number

of incoming packets on GigabitEthernet 2/0/1. Log the rising alarm event when the ratio exceeds 80%,

and take no actions when the ratio drops to 5%. The formula is

(1. 3 . 6 .1. 2.1.16 .1.1.1. 6 .1 * 10 0 / .1. 3 . 6 .1. 2.1.16 .1.1.1. 5 .1) , w h e r e 1. 3 . 6 .1. 2.1.16 .1.1.1. 6 .1 i s t h e O I D o f t h e o b j e c t

i n s t a n c e e t h e r S t a t s B r o a d c a s t P k t s .1, a n d 1. 3 . 6 .1. 2 .1.16 .1.1.1. 5 .1 i s t h e O I D o f t h e o b j e c t i n s t a n c e

etherStatsPkts.1.

<Sysname> system-view

[Sysname] rmon event 1 log

[Sysname] rmon event 2 none

[Sysname] interface gigabitethernet 2/0/1

[Sysname-GigabitEthernet2/0/1] rmon statistics 1

[Sysname-GigabitEthernet2/0/1] quit

[Sysname] rmon prialarm 1 (.1.3.6.1.2.1.16.1.1.1.6.1*100/.1.3.6.1.2.1.16.1.1.1.5.1)

BroadcastPktsRatioOfEth1/1 10 absolute rising-threshold 80 1 falling-threshold 5 2

entrytype forever owner user1

The last number in the OID forms of variables must be the same as the statistics entry index for the

interface. For example, if you execute the rmon statistics 5 command, you must replace

1. 3 . 6 .1. 2.1.16 .1.1.1. 6 .1 a n d 1. 3 . 6 .1. 2.1.16 .1.1.1. 5 .1 w i t h 1. 3 . 6 .1. 2 .1.16 .1.1.1. 6 . 5 a n d 1. 3 . 6 .1. 2.1.16 .1.1.1. 5 . 5 ,

respectively.

Related commands

• display rmon prialarm

• rmon event

rmon statistics

Use rmon statistics to create an entry in the RMON statistics table.