Datasheet

Intel

82599 10 GbE Controller—Specification Clarifications

4 Use of Wake on LAN Together with Manageability

The Wakeup Filter Control Register (WUFC) contains the NoTCO bit, which affects the behavior of the

wakeup functionality when manageability is in use. Note that if manageability is not enabled, the value

of NoTCO has no effect.

When NoTCO contains the hardware default value of 0b, any received packet that matches the wakeup

filters will wake the system. This could cause unintended wakeups in certain situations. For example, if

Directed Exact Wakeup is used and the manageability shares the host's MAC address, IPMI packets that

are intended for the BMC wakes the system, which might not be the intended behavior.

When NoTCO is set to 1b, any packet that passes the manageability filter, even if it also is copied to the

host, is excluded from the wakeup logic. This solves the previous problem since IPMI packets do not

wake the system. However, with NoTCO=1b, broadcast packets, including broadcast magic packets, do

not wake the system since they pass the manageability filters and are therefore excluded.

Note: Intel Windows* drivers set NoTCO by default.

5 SFP+ (SFI) Connection Clarification

The 82599 configuration is optimized to set link with an external partner. If the two ports of the 82599

are connected back-to-back in SFP+ (SFI) mode, link might fail to establish. Similarly, if transmit and

receive are connected together within the same port in SFP+ (SFI) mode, link might fail to establish.

This does not impact end users. This configuration would typically be encountered in a manufacturing or

test environment to verify link establishment and perform basic functionality checks. In this

environment, Intel recommends the use of a separate standalone link partner.

Note: There is a document that discusses the workaround for special cases. This document is

available under NDA. Contact your Intel representative for access.

Table 2-6 Effects of NoTCO Settings

WoL NoTCO

Share MAC

Address

Unicast packet

Broadcast

Packet

Magic Packet 0b N/A OK OK

Magic Packet 1b Y No wake No wake.

Magic Packet 1b N OK No wake.

Directed Exact

Y Wake even if MNG packet. No way to

talk to the BMC without waking host.

N/A

Directed Exact 0b N OK N/A

Directed Exact 1b N/A OK N/A