Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Uživatelský manuál stáhnout pdf (Strana 55)

SNMP, RMON, BOOTP, DHCP, and RARP Concepts

114070 Rev. B 2-23

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 Ethernet DCM (T

able 2-5).

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)

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.

Table 2-5. Default Size for Capture Buffer

Installed DRAM (MB) Default Size (KB)

232

464

8 256

16 512

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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Avaya Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services Uživatelský manuál Strana 55