06-28-2014
You can create VLANs,not for common communication, but to isolate layer-2 communication from other network objects. Security.
Example:
If I am on VLAN A I may not be able to ssh over to VLAN B. A lot of places will do this with development versus production servers. Code librarians work on VLAN C with access to A and B. DMZ's are another possible example of isolation at the layer-2 level. Layer-1 isolation is the same idea. If bad guys cannot see network object at all it cannot be attacked. Air gap attacks notwithstanding.
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VLAN(7) Miscellaneous Information Manual VLAN(7)
NAME
VLAN - virtual local area network
DESCRIPTION
This manpage provides a brief overview of VLAN (virtual LAN) technology.
VLANs are logical, or network segments that can span multiple physical network segments. A primary benefit of VLANs is that they can iso-
late broadcast and multicast traffic by determining which destinations should receive that traffic, thereby making better use of switch and
end-station resources.
Logical separation using VLAN allows for the logical grouping of PCs, servers and other network resources to behave as if they were con-
nected to the same, physical segment, even if they are not.
HP-UX VLAN is an implementation of IEEE 802.1p/Q standards.
VLAN interfaces can be configured in HP-UX servers using the command (see nwmgr_vlan(1M)) or (see lanadmin_vlan(1M)). HP recommends that
you use for HP-UX Release 11i Version 3 and forward. Interfaces can also be configured using the web-based management tool HP-UX System
Management Homepage (HP SMH).
Each VLAN interface created is assigned a VLAN PPA (VPPA) that is unique across the system and a VLAN ID, that identifies the virtual LAN
it is part of. The VLAN ID is unique on the interface on which the VLAN interface is created.
WARNINGS
The and commands are deprecated. These commands will be removed in a future HP-UX release. HP recommends the use of replacement command
nwmgr(1M) to perform all network interface-related tasks.
SEE ALSO
lanadmin(1M), lanadmin_vlan(1M), lanscan(1M), nwmgr(1M), nwmgr_vlan(1M), smh(1M).
IEEE 802.1p, IEEE 802.1Q
VLAN(7)