18-22
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 18 SNMP
18.11.4 History Control RMON Group
Note EtherStatsTable entries are not preserved if the SNMP agent is restarted.
18.11.3.2 Get Requests and GetNext Requests
Get requests and getNext requests for the etherStatsMulticastPkts and etherStatsBroadcastPkts columns
return a value of zero because the variables are not supported by ONS 15454 Ethernet cards.
18.11.3.3 Row Deletion in etherStatsTable
To delete a row in the etherStatsTable, the SetRequest PDU should contain an etherStatsStatus “invalid”
value (4). The OID marks the row for deletion. If required, a deleted row can be recreated.
18.11.3.4 64-Bit etherStatsHighCapacity Table
The Ethernet statistics group contains 64-bit statistics in the etherStatsHighCapacityTable, which
provides 64-bit RMON support for the HC-RMON-MIB. The etherStatsHighCapacityTable is an
extension of the etherStatsTable that adds 16 new columns for performance monitoring data in 64-bit
format. There is a one-to-one relationship between the etherStatsTable and etherStatsHighCapacityTable
when rows are created or deleted in either table.
18.11.4 History Control RMON Group
The History Control group defines sampling functions for one or more monitor interfaces in the
historyControlTable. The values in this table, as specified in RFC 2819, are derived from the
historyControlTable and etherHistoryTable.
18.11.4.1 History Control Table
The RMON is sampled at one of four possible intervals. Each interval or period contains specific history
values (also called buckets). Table 18-9 lists the four sampling periods and corresponding buckets.
The historyControlTable maximum row size is determined by multiplying the number of ports on a card
by the number of sampling periods. For example, a card that contains 24 ports when multiplied by
periods allows 96 rows in the table. A card that contains 14 ports when multiplied by four periods allows
56 table rows.
Table 18-9 RMON History Control Periods and History Categories
Sampling Periods
(historyControlValue Variable)
Total Values or Buckets
(historyControl Variable)
15 minutes 32
24 hours 7
1 minute 60
60 minutes 24
To Next Page
Loading...
Need help?
General
