Avaya Configuring DLSw Services Bedienungsanleitung PDF herunterladen (Seite 54)

Configuring DLSw Services

2-16

TCP Max Retransmission Timeout

The TCP Max Retransmission Timeout parameter setting determines the

maximum time between successive retransmissions. TCP performs calculations

that increase the time between data retransmissions to minimize network loading

during peak periods when there is an increased risk of lost data. TCP starts a

minimum retransmission time before increasing to the Max Retransmission

Timeout setting with successive retransmissions. Decreasing the Max

Retransmission Timeout decreases the notiﬁcation time by reducing the time

between intervals. This also slows network trafﬁc in congested, connected

networks.

In large networks with many routers, quick notiﬁcation of a failed router or link is

necessary. However, when some routers use a low Max Retransmission Timeout

parameter setting, other routers using the default setting may cause inconsistent

results. This means that some of the routers time out and report the lost TCP

connections quickly, while other routers using the default setting may take up to

20 minutes.

The Max Retransmission Timeout default setting is 240000 ms (4 minutes),

yielding a default time for learning of a lost TCP connection to approximately 20

minutes. Refer to Conﬁguring TCP Services for information on editing the Max

Retransmission Timeout parameter setting.

Flow Control

DLSw uses the following two ﬂow control mechanisms to provide reliable end-to-

end delivery of packets:

• LLC2 ﬂow control

• TCP ﬂow control

TCP and LLC2 continue to assert ﬂow control until congestion clears on a given

TCP connection.

The default settings for system parameters relevant to LLC2 and TCP ﬂow control

are suitable for the majority of your DLSw service requirements.

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 203 204

Keine Kommentare

Avaya Configuring DLSw Services Bedienungsanleitung Seite 54