VLAN problem

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Hi! I have small problem with VLAN and only one VM. I have 3 ESXi 5.1 (1117900), vCenter 5.1. I have vDS with port group, which has vlan number (for example vlan 703) 2 VM inside this port-group. all ESXi were installed on blades in 1 chassis. Each ESXi has 2 up-links, vDS include all ESXi (2 up-links from each host) Problem with network connection with one VM (hw7) - it's unavailable when it runs on ESX1, but it's available if I move it to ESX2 or ESX3. With second VM (hw9) I have no such problem - it's available on every ESX host... Any suggestion about network connection problem?

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