I have a very strange problem with VMotion and VLANS ..
First a description of our esx environment:
9 ESX Servers (Dell PowerEdge 2950)
Service Console and VMotion is in one vSwitch
Two NICs are configured for that vSwitch
Service Console Network-Range: 172.16.2.x
Service Console VLAN: 15
VMotion Network-Range: 172.16.30.x
VMotion VLAN: 6
Switch Name Num Ports Used Ports Configured Ports Uplinks
vSwitch0 32 5 32 vmnic1,vmnic0
PortGroup Name Internal ID VLAN ID Used Ports Uplinks
Service Console portgroup0 6 1 vmnic1,vmnic0
VMotion portgroup12 15 1 vmnic1,vmnic0
we are using 2 Cisco 3750 Switches and have configured our vlans on the switch:
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 6,15
switchport mode trunk
All Ports on the Cisco Switch are configured that way!
Here is the strange thing:
It worked for 4 ESX Servers, 2 are not working... I can reconfigure the other ESX Servers until these 2 are working..
These 2 servers don´t get the VLAN 15, I don´t know why ...
do you have any ideas?
Every time I have run into VLAN issues with cisco, it has been resolved with changing the default vlan on that switch port. Not sure why that fixes it, and it usually is a problem with VLAN 1, but it has fixed it on more than one occasion.