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62 Chapter 2: EIU messaging protocols
297-8991-910 Standard 03.01 August 1999
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.
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
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