Maximum Ethernet frame sizes
The largest frame size used during the connection process is controlled by the maximum frame size configurations of multiple items.
The maximum frame size for the connection is also influenced by exchange identifier negotiations and bridge considerations. Note that TCP/IP and SNA connections are limited by slightly different sets of items.
TCP/IP connections
The maximum frame size is associated with:
- the Ethernet standard that you select
- the line description (Gigabit Ethernet only)
- each service access point (SAP)
- the TCP/IP interface
SNA connections
The maximum frame size is associated with:
- the controller
- the Ethernet standard that you select
- each service access point (SAP)
During the connection process, your system selects the smallest common value of the maximum frame values. As previously stated, the actual maximum frame size used can become even smaller if the bridge cannot support the value selected by the system.
The following table shows the maximum frame sizes that are associated with the Ethernet standard that you select through the Ethernet standard (ETHSTD) field.
| ETHSTD parameter value | Frame type used | Maximum frame size in bytes | |
|---|---|---|---|
| SNA4 | TCP/IP | ||
| *IEEE8023 1 | IEEE 802.3 | 1496 | 8992 (1 Gbps/10 Gbps Ethernet)
1492 (all others) |
| *ETHV22 | Ethernet version 2 | 1493 | 9000 8992 (1 Gbps/10 Gbps Ethernet)
1500 (all others) |
| *ALL3 | IEEE 802.3 | 1496 | 8992 (1 Gbps/10 Gbps Ethernet)
1492 (all others) |
| Ethernet version 2 | 1493 | 9000 8992 (1 Gbps/10 Gbps Ethernet)
1500 (all others) |
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| Notes:
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