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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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LEARN ABOUT DEBIAN

vconfig

VCONFIG(8)						      System Manager's Manual							VCONFIG(8)

NAME

       vconfig - VLAN (802.1q) configuration program.

SYNOPSIS

       vconfig [lots of long options]

DESCRIPTION

       The  vconfig program allows you to create and remove vlan-devices on a vlan enabled kernel. Vlan-devices are virtual ethernet devices which
       represents the virtual lans on the physical lan.

OPTIONS

       add [interface-name] [vlan-id]
	      Creates a vlan-device on [interface-name]. The resulting vlan-device will be called according to the nameing convention set.

       rem [vlan-device]
	      Removes the named vlan-device.

       set_flag [vlan-device] 0 | 1
	      When 1 (the default since 2.6.18), ethernet header reorders are turned on.  Dumping the device will  appear  as  a  common  ethernet
	      device  without  vlans.  When  0	however, ethernet headers are not reordered, which results in vlan tagged packets when dumping the
	      device. Usually the default gives no problems, but some packet filtering programs might have problems with it.

       set_egress_map [vlan-device] [skb-priority] [vlan-qos]
	      This flags that outbound packets with a particular skb-priority should be tagged with the particular  vlan  priority  vlan-qos.  The
	      default vlan priority is 0.

       set_ingress_map [vlan-device] [skb-priority] [vlan-qos]
	      This  flags  that  inbound  packets  with the particular vlan priority vlan-qos should be queued with a particular skb-priority. The
	      default skb-priority is 0.

       set_name_type VLAN_PLUS_VID | VLAN_PLUS_VID_NO_PAD | DEV_PLUS_VID | DEV_PLUS_VID_NO_PAD
	      Sets the way vlan-device names are created. Use vconfig without arguments to see the different formats.

       NOTES  VLAN will use Broadcom's NICE interface when the network device supports it. This is necessary, since usually the hardware of  these
	      devices  already	removes the vlan tag from the ethernet packet. The set_flag option on vlan-devices created on such a physical net-
	      work device will be ignored.  Dumping the network-device will show only untagged(non-vlan) traffic,  and	dumping  the  vlan-devices
	      will only show traffic intended for that vlan, without the tags.

FILES

       /proc/net/vlan/config
       /proc/net/vlan/[vlan-device]

SEE ALSO

       ip(8), ifconfig(8)

AUTHORS

       This manual page was written by Ard van Breemen <ard@kwaak.net>
       The vlan patch is written by Ben Greear <greearb@candelatech.com>

																	VCONFIG(8)
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