Cisco Systems 15454 16.10.2 HC-RMON-MIB Support, 16.10.3 Ethernet Statistics RMON Group

16-18
Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 16 SNMP
16.10 16.10.2 HC-RMON-MIB Support
16.10.1.2 Row Creation in cMediaIndependentHistoryControlTable
SNMP row creation and deletion for the cMediaIndependentHistoryControlTable follows the same
processes as for the MediaIndependentTable; only the variables differ.
In order to create a row, the SetRequest PDU should contain the following:
• cMediaIndependentHistoryControlDataSource and its desired value
• cMediaIndependentHistoryControlOwner and its desired value
• cMediaIndependentHistoryControlStatus with a value of createRequest (2)
16.10.2 HC-RMON-MIB Support
For the ONS 15454, the implementation of the high-capacity remote monitoring information base
(HC-RMON-MIB, or RFC 3273) enables 64-bit support of existing RMON tables. This support is
provided with the etherStatsHighCapacityTable and the etherHistoryHighCapacityTable. An additional
table, the mediaIndependentTable, and an additional object, hcRMONCapabilities, are also added for
this support. All of these elements are accessible by any third-party SNMP client having RFC 3273
support.
16.10.3 Ethernet Statistics RMON Group
The Ethernet Statistics group contains the basic statistics monitored for each subnetwork in a single table
called the etherStatsTable.
16.10.3.1 Row Creation in etherStatsTable
The SetRequest PDU for creating a row in this table should contain all the values needed to activate a
row in a single set operation, and an assigned status variable to createRequest. The SetRequest PDU
object ID (OID) entries must all carry an instance value, or type OID, of 0.
In order to create a row, the SetRequest PDU should contain the following:
• The etherStatsDataSource and its desired value
• The etherStatsOwner and its desired value (size of this value is limited to 32 characters)
• The etherStatsStatus with a value of createRequest (2)
The etherStatsTable creates a row if the SetRequest PDU is valid according to the above rules. When the
row is created, the SNMP agent decides the value of etherStatsIndex. This value is not sequentially
allotted or contiguously numbered. It changes when an Ethernet interface is added or deleted. The newly
created row will have etherStatsStatus value of valid (1).
If the etherStatsTable row already exists, or if the SetRequest PDU values are insufficient or do not make
sense, the SNMP agent returns an error code.
Note EtherStatsTable entries are not preserved if the SNMP agent is restarted.