
Configuring Ethernet, FDDI, and Token Ring Services
314470-15.5 Rev 00 6-7
Version 15.5.0.0
The following implementation note is being added to the BayRS Version 15.5.0.0
Documentation Change Notice since it became available after publication of the
15.4.0.0 documentation.
Implementation Note
When you configure VLAN tagging on an ARN 10MB Ethernet Base Module, the
MTU for the Ethernet interface is set to 1518 bytes for the packets on this line.
Although the ARN 10MB Ethernet Base Module supports tagged packets, it does
not support 802.1Q tagged frames that are larger than 1518 bytes (1514 bytes plus
the 4-byte tag).
However, there are other Ethernet interfaces (such as the Ethernet and Tri-Serial
Expansion Module and the 10/100-TX UTP Base Module) that have an MTU of
1522 bytes and, consequently, do support the maximum size tagged packet (1518
bytes plus the 4-byte tag).
Because of differences in the MTU size supported, when you configure VLAN
tagging on an ARN 10MB Ethernet Base Module, you must make sure that no
other tagged hosts on the LAN that are attached to the 10BT motherboard
Ethernet port have MTUs greater than 1518 bytes. If they do, you must reset their
respective MTUs to 1518 bytes so they can interoperate properly with the ARN
10MB Ethernet Base Module.
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