Juniper Networks EX2500 - Manual (Page 83)

RMON Group 2—History „ 69
Chapter 6: Remote Monitoring
RMON Group 2—History
The RMON History Group allows you to sample and archive Ethernet statistics for a
specific interface during a specific time interval. History sampling is done per port.
Data is gathered during discreet sampling intervals and stored in “buckets.” At each
configured interval, the History index takes a sample of the current Ethernet
statistics and places them into a bucket. History data buckets reside in dynamic
memory. When the switch is rebooted, the buckets are emptied.
Requested buckets are the number of buckets, or data slots, requested by the user
for each History Group. Granted buckets are the number of buckets granted by the
system, based on the amount of system memory available. The system grants a
maximum of 50 buckets.
You can use an SNMP browser to view History samples, or use the following
command:
ex2500# show rmon history
History MIB Object ID
The type of data that can be sampled must be of an ifIndex object type, as
described in RFC 1213 and RFC 1573. The most common data type for the History
sample is as follows:
1.3.6.1.2.1.2.2.1.1.x
The last digit ( x ) represents the number of the port to monitor. In the CLI, you do
not need to enter the History MIB Object Identifier (OID), because the port is
specified when you enter Interface Port mode.
Configuring RMON History
Perform the following steps to configure RMON History on a port.
1. Enable RMON on a port.
ex2500(config)# interface port 1
ex2500(config)# rmon enable
2. Configure the RMON History parameters for a port.
ex2500(config-if)# rmon collection-history 1 buckets 30
ex2500(config-if)# rmon collection-history 1 interval 120
ex2500(config-if)# rmon collection-history 1 owner “rmon port 1 history”
This configuration enables RMON History collection on port 1.
NOTE: RMON port statistics must be enabled for the port before an RMON History
Group can monitor the port.