62Chapter 2: EIU messaging protocols

Maximums are defined for the number of TCP connections allowed on a node, as shown in table 5. UDP connection maximums are shown in table 6 on page 62.

Table 5 TCP connection limits by SuperNode subsystem

Subsystem

Maximum TCP connections

 

 

computing module

64

 

 

function processor

32

 

 

EIU

32

 

 

APU

1

 

 

 

 

Table 6 UDP connection limits by SuperNode subsystem

 

 

Subsystem

Maximum UDP connections

 

 

computing module

32

 

 

function processor

32

 

 

EIU

32

 

 

APU

32

 

 

The parameter TCP_CONN controls the number of TCP connections for the node. The value for this parameter can be changed at any time regardless of the status of the node. The new value is immediately propagated to the node concerned, provided the node is in service.

If TCP was in service before the value of TCP_CONN is decreased, the existing TCP connections are dropped immediately and the users are notified accordingly. TCP remains out of service until it can reallocate its resources (control blocks, buffers, and timers) to accommodate the new number of allowed TCP connections.

If the new value is zero, TCP remains out of service until a nonzero value number is datafilled for that node.

The DMS-100 switch responds in the same way when the IP address of the node is modified while the node is in service. In this case, if the number of TCP connections remains the same or is increased, the reallocation is not required. If both the IP address and the number of TCP connections are modified, the consequences are similar to the situation in which only the number of TCP connections is decreased. The system generates a log for each connection dropped. This functionality must be exercised very cautiously, since it may

297-8991-910 Standard 03.01 August 1999

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Cabletron Systems DMS-100 manual Eiu Apu, UDP connection limits by SuperNode subsystem, Subsystem Maximum UDP connections