
SNMP, RMON, BootP, DHCP, and RARP Concepts
117362-A Rev. A 2-25
Example
You specify a buffer size of 32 KB and a packet slice size of 1 KB. After checking
the available memory, the RMON agent allocates the buffer size you requested.
The buffer can hold a maximum of 32,768 / (1024 + 20), or 31 packets.
Alarm and Event Groups
When you enable the Ethernet DCM, the router does not create default alarm or
event entries. We recommend that you create alarm and event entries using a
network management application.
You can create as many alarm or event entries as memory permits, up to the
RMON limit of 65,535 entries. The memory limitation for alarm and event groups
is based on the memory resources allocated on the router base module rather than
the Ethernet DCM memory resources. The RMON alarm and event groups are
maintained by the router base module. All other RMON groups are supported on
the Ethernet DCM.
Each alarm entry requires 232 bytes. Each event entry requires 542 bytes.
The log table can accommodate up to 65,535 entries. Each entry in the log table
requires 267 bytes. You cannot delete log entry rows. Therefore, as events are
triggered and the event type specifies logging, the log table increases in size.
Although there is no way to delete a specific log entry, all log entries in the log
table corresponding to a single event entry are deleted when the event entry is
deleted.
Note: The RMON agent allocates the full amount of memory you specify for
the packet slice size to each packet, even if the packet size is smaller than this
amount. For this reason, Bay Networks recommends that you set the packet
slice size to the smallest size possible. The maximum packet size is 2 KB.
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