Avaya Configuring IP Utilities Uživatelský manuál stáhnout pdf (Strana 36)

Configuring IP Utilities

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The value you set for Maximum Window Size depends on how much memory you

need for services other than TCP. If you have a complicated conﬁguration, specify

a low Max. Window Size value for TCP connections, since space is limited.

Systems with less involved conﬁgurations can support more TCP connections and

a higher Maximum Window Size value.

If TCP consumes too much memory on the router, connections slow down or even

abort. TCP uses feedback mechanisms to indicate to clients when resources are

becoming scarce. However, if clients disregard this feedback, TCP has to break

connections. TCP attempts to monitor the connections consuming the most

memory and break those ﬁrst to maintain connections consuming less memory.

TCP and IP Service Users

TCP is the layer or service between IP, at the lower layer in the hierarchy of

network protocols, and programs running at higher layers in the hierarchy.

Figure 2-1 shows a simple network architecture with four users of TCP/IP

services: data link switching (DLSw), Telnet, FTP, and BGP.

Figure 2-1. TCP between IP and Clients

TCP

Telnet BGP

DLSw FTP

TCP0001A

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Avaya Configuring IP Utilities Uživatelský manuál Strana 36