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Special Forums IP Networking Proxy Server Linux Networking - VLANs & Multiple IP's Post 302920571 by PCB on Friday 10th of October 2014 06:23:17 AM
Old 10-10-2014
Hi,

No doubt that a physical server and hence base hypervisor would connect to multiple VLANs and do VLAN tagging (e.g. in VMWare distributed switch). E.g. vMotion on one VLAN, VMWare admin on another, iSCSI on another etc.

What I'm referring to is the actual individual VM's inside the hypervisor. How many VLANs would they be connected to?

---------- Post updated at 12:23 PM ---------- Previous update was at 12:17 PM ----------

Here is an example picture :

Image

See how each individual virtual machine is connected to only one VLAN, even though the physical host is connected to many VLANS. VM1 could connect to VLAN1, VM2 to VLAN2, VM3 to VLAN2 etc. What about a scenario where VM4 connects to VLAN 1 and VLAN2? I have never once found a picture nor seen an actual environment where a virtual machine has lines going to two different VLANs. Under what circumstances would it be necessary for a a virtual machine to go to 2 different VLANs?
 

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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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