Hp Integrity Network Adapter Teaming And Advanced Networking Features; Checksum Offloading; 802.1P Qos Tagging; Large Send Offload (Lso) - HP Integrity rx2800 - i2 White Paper

HP Integrity Network Adapter Teaming and Advanced Networking Features

When adapter ports are members of a team, some advanced features are no longer configurable
on the port's Advanced Settings tab. These advanced features are either promoted to the team's
Advanced Settings tab because the features are compatible and supported by all team members,
or not promoted because one or more ports do not support the features. There are also special
cases where a feature is supported by all team members but the implementation is not compatible
between the team members because they use different miniport drivers. In this case, it is not
promoted to the team's Advanced Settings tab.

Checksum Offloading

Checksum Offloading, Transmit TCP Checksum Offloading, Transmit IP Checksum Offloading,
and Receive IP Checksum Offloading. HP Integrity Network Adapter Teaming supports the
offloading advanced feature when it is supported by all the teamed ports in the same team. If
one or more teamed ports in the same team have the feature enabled and the feature is supported
by all teamed ports in the same team, the feature is promoted to the team's Advanced Settings
tab as ENABLED and the teaming driver automatically enables this feature on all ports. If all
teamed ports in the same team have the feature disabled and the feature is supported by all
teamed ports in the same team, the feature is promoted to the team's Advanced Settings tab as
DISABLED.
Although some adapters' implementation of checksum offloading is not 100% compatible with
other adapters, the team handles the incompatibilities internally and the features are available.

802.1p QoS Tagging

HP Integrity Network Adapter Teaming supports the advanced feature 802.1p QoS, when
supported by all teamed ports in the same team. This feature is used to mark frames with a
priority level for transmission across an 802.1p QOS-aware network. If all teamed ports in the
same team have the feature enabled, the feature is promoted to the team's Advanced Settings
tab as ENABLED. If one or more teamed ports in the same team have the feature disabled, and
the feature is supported by all teamed ports in the same team, the feature is promoted to the
team's Advanced Settings tab as DISABLED. If any one team member does not support 802.1p
QOS, then the feature will not be promoted to the team's Advanced Settings tab. Most HP NC
Series network adapters support this advanced feature.

Large Send Offload (LSO)

HP Integrity Network Adapter Teaming supports the advanced feature Large Send Offload
(LSO) (sometimes referred to as TCP Segmentation Offload) when it is supported by all the
teamed ports in the same team. This feature allows teamed ports in the same team to offload
large TCP packets for segmentation in order to improve performance. If one or more teamed
ports in the team have the feature enabled and the feature is supported by all teamed ports in
the same team, the feature is promoted to the team's Advanced Settings tab as ENABLED and
the teaming driver automatically enables this feature on all adapters. If all teamed ports in the
same team have the feature disabled and the feature is supported by all teamed ports in the same
team, the feature is promoted to the team's Advanced Settings tab as DISABLED.
Although some adapters' implementation of LSO is not 100% compatible with other adapters,
the team handles the incompatibilities internally and the features are available. Refer to
www.microsoft.com/whdc/device/network/taskoffload.mspx

Maximum Frame Size (Jumbo Frames)

HP Integrity Network Adapter Teaming supports the advanced feature Maximum Frame Size
(Jumbo Frames) when supported by all teamed ports in the same team. This feature allows
teamed ports to increase maximum frame size for TCP/IP packets transmitted and received in
order to improve performance. If all teamed ports in the same team support jumbo frames, the
84 The Mechanics of Teaming for the Advanced User
for more information.
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