Transition Networks N-GXE Series, Руководство пользователя

Страница: 14 / 26

Transition Networks N ‐ GXE ‐ xx ‐ 02 User Guide
33748 Rev. A https://www.transition.com/ Page 14 of 26
Jumbo Frames
Jumbo Frames are Ethernet frames larger than 1518 bytes. Jumbo Frames can be used to reduce server
CPU utilization and increase throughput. Note, however, that using Jumbo Frames may introduce
latency. Also, end ‐ to ‐ end network devices must support Jumbo Frames, otherwise packets will be
dropped. Jumbo Frames also require compatible switch connections that can forward Jumbo Frames;
see the switch user guide or contact your network administrator. Jumbo Frames supported protocols
include TCP and UDP only. The N ‐ GXE ‐ xx ‐ 02 supports Jumbo Frames up to 9014 bytes.
TCP Segmentation Offload (up to 256 Kb)
This networking technology helps transfer the workload from the CPU to a network adapter during
network data transfer. In Windows Server 2008, TCP Segmentation Offload enables the Windows
networking subsystem to offload the processing of a TCP/IP connection to a network adapter that
includes special support for TCP/IP offload processing. TCP Segmentation Offload is available in all
versions of Windows Server 2008 and Windows Vista. TCP Segmentation Offload will work only if it is
enabled in both locations.
IPv6 support for IP/TCP and IP/UDP RX Checksum Offload
When enabled, the checksum is calculated by the NIC instead of the system CPU. This reduces CPU load
and can improve system performance in high ‐ traffic environments. There is typically no need to disable
checksum offload.
Fragmented UDP Checksum Offload for Packet Reassembly
When enabled, the checksum is calculated by the NIC instead of the system CPU. This reduces CPU load
and can improve system performance in high ‐ traffic environments. There is typically no need to disable
checksum offload.
PXE Boot
This specification describes a standardized client ‐ server environment that boots a software assembly,
retrieved from a network, on PXE ‐ enabled clients. On the client side it requires only a PXE ‐ capable NIC,
and uses a small set of industry ‐ standard network protocols.
UEFI Boot
The Unified Extensible Firmware Interface (UEFI) specification defines a software interface between an
OS and platform firmware. UEFI replaces the BIOS firmware interface originally present in all IBM PC ‐
compatibles. Most UEFI firmware implementations provide legacy support for BIOS services. The Unified
EFI Forum is the industry body that manages the UEFI specification.
Smart Load Balancing (SLB) and Failover
In a Smart Load Balance and Failover team, a standby member handles the traffic if all of the load
balance members fail (considered a failover event). All load balance members must fail before the
standby member takes over. When one or more of the load balance members is restored (fallback), the
restored team member(s), resume handling traffic.