94Chapter 3: EIU datafill

If there is a serious performance problem, typically on very slow networks, modification of this table may be considered to increase timeout values.

Datafill sequence and implications

There are no datafill sequence and implications.

Datafill

Table 23 lists the fields and value ranges used to datafill an EIU in table

IPPROTO.

Table 23 Field descriptions for table IPPROTO for EIU datafill

Field

Subfield or

Entry

Explanation and action

 

refinement

 

 

 

 

 

 

IPRSMTMO

 

1 to 100

The IP reassembly time-out. This field

 

 

(seconds)

sets the time when IP reassembly gives

 

 

 

up reassembling a packet.

 

 

 

By default the IP reassembly time-out is

 

 

 

10 seconds. The time-out can be

 

 

 

modified to improve performance in

 

 

 

extreme network conditions. On

 

 

 

extremely slow networks this may be

 

 

 

increased to give reassembly a better

 

 

 

chance to reassemble before the time-

 

 

 

out occurs.

ARPRFTMO

 

1 to 720

ARP cache time-out. On slow networks,

 

 

(seconds)

the ARP cache time-out can be

 

 

 

increased from the default of 1minute.

 

 

 

Increasing the time-out too much can

 

 

 

cause an excessively large ARP cache,

 

 

 

thereby reducing the network

 

 

 

performance.

 

 

 

 

Sample datafill for table IPPROTO

Figure 20 shows sample datafill for table IPPROTO.

Figure 20 Datafill example for table IPPROTO

IPPKEY IPRSMTMO ARPRFTMO

------------------------

0 20 2

297-8991-910 Standard 03.01 August 1999

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Cabletron Systems DMS-100 manual Sample datafill for table Ipproto, Iprsmtmo, Arprftmo