Vlans - 3Com EtherLink 3C980C-TXM User Manual

12 C
HAPTER
If any NIC in a bidirectional arrangement fails, receive
load balancing is disabled, and the other NICs continue
transmit-only load balancing activity. If the primary NIC fails,
a secondary NIC takes over packet reception for the group.
Bidirectional load balancing is restored after a failure when
applications create new connections and new clients log in.
Figure 2 Bidirectional Load Balancing Failover
Bidirectional
load balancing
Server
Primary Secondaries
Switch
Clients

VLANs

A VLAN is a group of location-independent and
topology-independent devices that communicate as if
they were on the same physical LAN. Network devices on
different LAN segments and of different media types can
be members of the same VLAN. Membership in a VLAN is
determined by a VLAN tag that is transmitted with the
Ethernet frame for use by a switch.
With VLANs, you can define a network according to:
1: I
NTRODUCTION
In a bidirectional load balancing arrangement, all NICs
receive packets. If any NIC fails, receive load balancing
is disabled, and the other NICs continue transmit-only
load balancing activity. Receive load balancing is restored
when new connections are established with clients.
Primary Secondaries
®
Organizational groups—For example, you can have one
VLAN for the Marketing department and one for the
Finance department.
Application groups—For example, you can have one
VLAN for e-mail users and one for multimedia users.
Primary failure
®
Secondary failure
Primary Secondaries
®