Allied Telesis AT-2972SX, AT-2916SX VLANs Support Adaptive Interrupt Frequency Dual DMA Channels

VLANs Support

Adaptive

Interrupt

Frequency

Dual DMA

Channels

Advanced Control Suite User’s Guide

Table 7. Example VLAN Network Topology (Continued)

Component	Description
PC #5	A member of both VLANs #1 and #2, PC #5 has an
	Allied Telesyn adapter installed. It is connected to
	switch port #10. Both the adapter and the switch port
	are configured for VLANs #1 and #2 and have tagging
	enabled.

Note

VLAN tagging is only required to be enabled on switch ports that create trunk links to other switches. It is also required on ports connected to tag-capable end-stations, such as servers or workstations with adapters.

Virtual Local Area Networks (VLANs) are commonly used to split up groups of network users into manageable broadcast domains, to create logical segmentation of workgroups, and to enforce security policies among logical segments.

Each Team supports up to 64 VLANs. Note that only the Allied Telesyn adapters can be part of a team with VLANs. With multiple VLANs on an adapter, a server with a single adapter can have a logical presence on multiple IP subnets. With multiple VLANs in a team, a server can have a logical presence on multiple IP subnets and benefit from load balancing and failover.

Note

Adapters that are members of a failover team can also be configured to support VLANs.

Based on traffic conditions, the adapter driver intelligently adjusts host interrupt frequency to increase overall application throughput. When traffic is light, the adapter driver interrupts the host for each received packet, minimizing latency. When traffic is heavy, the adapter issues one host interrupt for multiple, back-to-back incoming packets, preserving the host CPU cycles.

The PCI interface on the Gigabit Ethernet Adapter contains two independent DMA channels for simultaneous read and write operations.

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