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IBM Protocols and Services Notes 49
You must reboot the bridge/router before this change takes effect. Table 9 shows
the maximum number of circuits possible with the different CONNectionUsage
parameter settings. The practical limit may be lower and depends on the traffic
load, CPU, and memory usage by other services.
Number of TCP Connections
3Com LLC2 tunneling uses one TCP connection for each LLC2 session. DLSw
scales to large networks better than LLC2 tunneling because it multiplexes all LLC2
sessions over one TCP connection per tunnel. Each Telnet session also uses one
TCP connection. Table 10 shows the maximum number of TCP connections
possible with the different CONNectionUsage parameter settings. The practical
limit may be lower and depends on the traffic load, CPU, and memory usage by
other services.
Front-End
Processor/Frame Relay
Access for LLC2 Traffic
The maximum number of FradMap entries that may be defined for each Frame
Relay port is 50.
HPR and ISR
Configurations
High Performance Routing (HPR) is enabled by default. Therefore, if you are
configuring APPN Intermediate Session Routing (ISR), you must disable HPR on
both the PortDef and the AdjLinkSta parameters by setting HPR = No.
IBM Boundary Routing
Topology Disaster
Recovery
In an IBM Boundary Routing topology that uses disaster recovery through PPP
(when two paths are mapped to one port), a disruption to existing SNA and
Table 9 DLSw Circuit Maximums with CONNectionUsage Parameter Settings
Maximum Number of DLSw Circuits
System Low Medium High
OfficeConnect and SuperStack II
NETBuilder bridge/routers
190 390 790
Boundary router peripheral node
*
* The CONNectionUsage parameter is set to High by the Boundary Router Peripheral node software; it
cannot be changes.
n/a n/a 790
†
† The IBM Boundary Router peripheral node uses two LLC2 circuits to support one LLC2 end system.
Therefore, the maximum number of LLC2 end systems supported by an IBM Boundary Router peripheral
node is 395.
NETBuilder II bridge/router
DPE modules 390 790 7990
Table 10 TCP Circuit Maximums with CONNectionUsage Parameter Settings
Maximum Number of TCP Circuits
System Low Medium High
OfficeConnect and SuperStack II
NETBuilder bridge/routers
32 256 512
Boundary router peripheral node
*
* The CONNectionUsage parameter is set to High by the Boundary Router peripheral node software; it
cannot be changed.
n/a n/a 790
NETBuilder II bridge/router
DPE module 32 512 2048