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Full Discussion: VLANs and their domains
Special Forums IP Networking VLANs and their domains Post 302907496 by Lost in Cyberia on Saturday 28th of June 2014 05:23:18 PM
Old 06-28-2014
VLANs and their domains

Hey everyone. I work in a data center, and I'm working on getting my CCNA. Now when I read articles on the idea of VLAN's it makes sense. Especially if you have multiple switches daisy chained in multiple locations. My two main questions though are that most of these examples use PC's as examples for using VLAN's. But in the environment I work in, we have clients who have 2 and 3u servers, with multiple hard drive bays in these vlans. I don't know what these machines are running, but what could they possibly need to communicate to each other for?

Even in regards to normal PC's like in the examples I read in the cisco book, what protocol or data is sent directly to another PC? If I'm using something like yahoo instant messenger, and I send a message to the person on the same VLAN, does that packet/frame ever leave the vlan? or is it send directly to the switch and the switch sends it to the receiver? Wouldn't something like that go to a Yahoo messaging server somewhere and then send back to the person sitting next to me?

I ask this because I can't think of information that is send directly from one computer to the next without it ever leaving a vlan. Except transfers files or something and the idea of separating broadcasts.

Hope this line of questioning makes sense! Thanks!
 

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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)
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