Advanced Server Features

rx_flow_control

Enables or disables receiving flow control (pause) frames. This parameter is used together with auto_flow_control. The valid values are:

0pause receive disabled (default)

1pause receive enabled if auto_flow_control is set to 0, or pause receive advertised if auto_flow_control is set to 1

tx_flow_control

Enables or disables transmitting flow control (pause) frames. This parameter is used together with auto_flow_control. The valid values are:

0pause transmit disabled (default)

1pause transmit enabled if auto_flow_control is set to 0, or pause transmit advertised if auto_flow_control is set to 1

auto_flow_control

Enables or disables auto-negotiation of flow control. This parameter is used together with rx_flow_control and TX_flow_control to determine the advertised flow control capability. The valid values are:

0flow control auto-negotiation disabled (default)

1flow control auto-negotiation enabled with capability specified in rx_flow_control and TX_flow_control (only valid if line_speed is set to 0)

mtu

Enables jumbo frames up to the specified MTU size. The valid range is from 1500 to 8184.

Advanced Server Features

The Advanced Server Features program is a kernel module designed for the Linux 2.2 kernel that provides load balancing, failover, and VLAN features. These features are provided by creating teams that consist of multiple NICs. A team can consist of 1 to 8 NICs and each NIC can be designated primary or standby. All primary NIC in a team will participate in load balancing operations by sending and receiving a portion of the total traffic. Standby NICs will take over in the event that all primary NICs have lost their links. VLANs can be added to a team to allow multiple VLANs with different VLAN IDs and

a virtual device is created for each VLAN added.

Advanced Server Features program supports load balance and generic trunking. In load balance mode, all the NIC drivers must support NIC Extension (NICE). In this distribution, only 3Com NICs are supported. Load balance mode works with all Ethernet switches without configuring the switch ports to any special trunking mode. Only IP traffic will be load balanced in both inbound and outbound directions. The generic trunking mode does not require NICE and can work with any NIC, however, it requires the Ethernet switch to support link aggregation and be properly configured. This mode is protocol-independent and all traffic should be load balanced and fault tolerant.

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3Com 3C996B-T manual Advanced Server Features