User guide

User Guide NetXtreme II
September 2013
Broadcom Corporation
Document INGSRVT78-CDUM100-R Managing the LAN Device Page 257
IPv4 Large Send Offload. Normally, the TCP segmentation is done by the protocol stack. When you enable the Large Send
Offload property, the TCP segmentation can be done by the network adapter. The default setting for this property is Enabled.
This property is only available for Broadcom NetXtreme II adapters.
IPv6 Checksum Offload. Normally, the checksum function is computed by the protocol stack. When you select one of the
Checksum Offload property values (other than None), the checksum can be computed by the network adapter.
• Rx Enabled. Enables receive TCP/IP/UDP checksum offload.
• Tx Enabled. Enables transmit TCP/IP/UDP checksum offload.
• Tx/Rx Enabled (default). Enables transmit and receive TCP/IP/UDP checksum offload.
• None. Disables checksum offload.
IPv6 Large Send Offload. Normally, the TCP segmentation is done by the protocol stack. When you enable the Large Send
Offload property, the TCP segmentation can be done by the network adapter. The default setting for this property is Enabled.
This property is only available for Broadcom NetXtreme II adapters.
Jumbo Packet. Enables the network adapter to transmit and receive oversized Ethernet frames that are greater than 1514
bytes, but less than or equal to 9000 bytes in length (9600 bytes for network adapters that operate at 10 Gbps). This property
requires the presence of a switch that is able to process jumbo frames. This property is only available for Broadcom
NetXtreme II adapters.
Frame size is set at 1500 bytes by default. To increase the size of the received frames, raise the byte quantity in 500-byte
increments.
NOTE: If Jumbo Packet is set to 5000 bytes or greater on network adapters that support 10 Gbps link speed,
ensure that Flow Control is set to Auto to prevent the system performance from performing at less than optimal
levels. This limitation exists on a per-port basis.
NOTE: If SR-IOV is enabled on a virtual function (VF) on the adapter, ensure that the same jumbo packet settings
is configured on both the VF and the Microsoft synthetic adapter. You can configure these values using Windows
Device Manager > Advanced properties.
If there is a mismatch in the values, the SRIOV function will be shown the the Degraded state in Hyper-V >
Networking Status.
Locally Administered Address. The Locally Administered Address is a user-defined MAC address that is used in place of
the MAC address originally assigned to the network adapter. Every adapter in the network must have its own unique MAC
address. This locally administered address consists of a 12-digit hexadecimal number.
• Value. Assigns a unique node address for the adapter.
• Not Present (default). Uses the factory-assigned node address on the adapter.
The appropriate assigned ranges and exceptions for the locally administered address include the following:
• The range is 00:00:00:00:00:01 to FF:FF:FF:FF:FF:FD.
• Do not use a multicast address (least significant bit of the high byte = 1).
• Do not use all 0s or all Fs.
Receive Side Scaling. Allows configuring network load balancing across multiple CPUs. The default setting for this property
is Enabled.