Unfortunately, SNMP is not well suited for gathering large volumes of data, especially
over short time intervals. It is inadequate for use by accounting applications because:
•
The SNMP PDU layout has a low payload-to-overhead ratio.
•
Processing SNMP PDUs is expensive because objects and tables need to be sorted in
lexicographic order.
The router avoids the need for continuous polling of SNMP statistics by using applications
known as
collectors
to retrieve data. You can configure up to six collectors. The router
sends collected statistics through FTP to assigned hosts, known as
receivers
. You must
assign a primary receiver to each collector, and you can assign a secondary receiver for
redundancy.
NOTE:
The basic-encoding-rules (BER)–encoding choice is not supported.
You can collect interface bulk statistics based on sets of virtual router groups. If sets of
virtual router groups generally correspond to ISPs, you can then forward the relevant
data to a particular ISP.
To configure a collector to include data from a specific list of virtual routers, you must
first configure a collector and then associate a router set with it. A collector can have up
to 64 virtual routers associated with it.
To collect bulk statistics for a subset of all configured subinterfaces, you can define the
subinterfaces using the following syntax:
Slot/Port[.subInterfaceId]
Per virtual router collection is supported on the if-stats and igmp schemas. It is supported
on all interface types supported by BulkStats. Collectors modified to use per virtual router
collection or configured after a collector has started have a time delay (up to the
configured time in seconds) until an active collector starts again.
The maximum number of interfaces for each type of interface and line module can differ.
Bulk statistics can collect these statistics when you configure the slots with their respective
interfaces to the corresponding maximum values. For information about maximum values
see
JunosE Release Notes
,
Appendix A
,
System Maximums
.
NOTE:
Define all interface types before you map a collector to the if-stats
schema to ensure that you display statistics for all configured interfaces in
the first interval.
The name of the bulk statistics file that is transferred to the host when there is a
collectorSequence attribute in the remote name is as follows:
fileName - z - mmddHHMM - s. sts
where:
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