Using Kernel 2.2.14 under Redhat-6.1, the TLAN driver is reporting 0 octets for the TLAN interfaces. There are packet counts for the interface but the octets do not incrememnt. The loopback octets (There is significant local traffic on that system) do increment properly. This behavior has been demonstrated on an additional system running a similar configuration.
Fixed in the 2.2.16 errata kernel