CommServer EZBEPORT Help

The TCP/IP Sysplexports function uses a Coupling Facility list structure (EZBEPORT) to allow TCP/IP applications to share a pool of ephemeral ports when using the same DVIPA (Dynamic Virtual IP Address) as a source IP address. The size of the EZBEPORT structure depends on the number of DVIPAs expected to be used for ephemeral port allocation sharing, and the average number of TCP/IP stacks per DVIPA.

DVIPAS

The number of Dynamic Virtual IP Addresses that are expected to participate in ephemeral port allocation sharing across the sysplex.

TCPIP Stacks

The average number of TCP/IP stacks per DVIPA that are expected to participate in ephemeral port allocation sharing across the sysplex, including those using the EXPLICITBINDPORTRANGE parameter of the GLOBALCONFIG statement in the TCP/IP profile. For each DVIPA, calculate the total number of TCP/IP stacks in the sysplex which will be using that DVIPA as a source IP address. Add the totals for all DVIPAs together and divide by the number of DVIPAs. For example, if you have 3 DVIPAs that will participate in ephemeral port allocation sharing across the sysplex, and the first DVIPA will have 3 TCP/IP stacks using it as a source IP address, the second DVIPA will have 5 TCP/IP stacks using it as a source IP address, and the third DVIPA will have 4 TCP/IP stacks using it as a source IP address, then the total number of TCP/IP stacks is 12 and the average is 4.