
Connecting BayStack AN and ANH Systems to a Network
6-28 114074 Rev. A
The Matrix configuration requires 212 bytes. The Matrix data requires
approximately 178 bytes of memory per source/destination pair the DCM detects
on a segment.
Filter and Capture Groups
You must create Filter and Capture configurations through your RMON network
management application. You can create as many filters and capture buffers as
memory permits, up to the RMON limit of 65,535 configurations.
Memory requirements vary greatly according to the size and number of the filters
and the size of the capture buffer. In most cases, you need 3 to 5 KB of memory
for the Filter and Packet Capture configuration.
The size of the capture buffer determines the amount of memory you need for the
data. You can request the largest buffer size available by specifying a buffer size
of -1 through your RMON network management application. When you specify
-1 for the capture buffer size, the agent attempts to allocate a default buffer
depending on the DRAM in the DCM
(Table 6-3).
You can also request a larger buffer size up to 15 MB. In any case, if there is not
enough memory currently available to satisfy the request, the agent will provide a
buffer that uses all available memory.
You can determine the maximum number of packets that an agent can capture in a
buffer as follows:
buffer size/(packet slice size + 20 bytes)
Caution: The memory you need for a Filter/Capture configuration and for
storing captured packets can easily exhaust all the available memory on a
DCM, particularly if the filters are not selective.
Table 6-3. Default Size for Capture Buffer
Installed DRAM (MB) Default Buffer Size (KB)
232
464
8 256
16 512
Komentarze do niniejszej Instrukcji