Sun Microsystems E25544-02, Руководство пользователя

Страница: 68 / 90

58 Sun Dual Port 10GBase-T Adapter User’s Guide • July 2012
VLAN Overview
With multiple VLANs on a single port, a server with a single adapter can have a
logical presence on multiple IP subnets. By default, you can define 128 VLANs for
each VLAN-aware adapter on your server. However, you can increase this number
by changing the system parameters.
If your network does not require multiple VLANs, you can use the default
configuration, in which case no further configuration is necessary.
VLANs enable you to split your physical LAN into logical subparts, providing an
essential tool for increasing the efficiency and flexibility of your network.
VLANs are commonly used to separate groups of network users into manageable
broadcast domains, to create logical segmentation of workgroups, and to enforce
security policies among each logical segment. Each defined VLAN behaves as its own
separate network, with its traffic and broadcasts isolated from the others, increasing
the bandwidth efficiency within each logical group.
Although VLANs are commonly used to create individual broadcast domains or
separate IP subnets, it can be useful for a server to have a presence on more than one
VLAN simultaneously. Several Oracle Sun products support multiple VLANs on a
per-port or per-interface basis, allowing very flexible network configurations.
The following figure shows an example network that uses VLANs.