Allied Telesis AT-2972T/2 - Manual (Page 111)

AT-29xx Series Gigabit Ethernet Adapters Installation Guide
111
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 Allied Telesis AT-29xx Series Gigabit Ethernet
network adapters.
VLANs Support
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. 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.
Adaptive
Interrupt
Frequency
The adapter driver intelligently adjusts host interrupt frequency based on
traffic conditions, 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 host CPU
cycles.
Dual DMA
Channels
The PCI interface on the Allied Telesis AT-29xxSX Series Gigabit Ethernet
adapter contains two independent DMA channels for simultaneous read
and write operations.
32-bit or 64-bit
PCI Bus Master
Compliant with PCI Local Bus Rev 2.2, the PCI interface on the Allied
Telesis AT-29xxSX Series Gigabit Ethernet adapter is compatible with
both 32-bit and 64-bit PCI buses. As a bus master, the adapter requests
access to the PCI bus, instead of waiting to be polled.
ASIC with
Embedded RISC
Processor
The core control for the Allied Telesis AT-29xxSX Series Gigabit Ethernet
adapter resides in a tightly integrated, high-performance ASIC which
includes dual RISC processors. This provides the flexibility to add new
features to the card and adapt it to future network requirements via
PC 5 A member of both VLANs 1 and 2, PC 5 has an
AT-29xxSX Series Gigabit Ethernet 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.
Table 5. Example VLAN Network Topology (Continued)
Component Description