Cluster nodes cant ping each other

Hi,

I have recently put one of our old clusters back online, its a poweredge 1855. I'm working on 5 nodes, and it has a PowerConnect 5316M on the back. The 5316M has only 1 cable connecting it to the uplink switch.

Each blade has 2 NIC's. One of them is a normal production NIC, with a normal IP on our range. All blades can ping each other on this address, and they all have internet.

The other NIC is what I'm going to use for live migration, or cluster heartbeat or something ..either way, it has a different range with no gateway (172.50.1.x)

Now, 3 of the blades can all ping eachother, but not the other 2. And the 2 that cant ping, can ping eachother. So it looks like 2 are on the same VLAN, and the other 3 are on the same VLAN.

The problem i have, is the switch shows them all on the default VLAN ..and one thing i cant work out ..is if the servers all have 2 NICs, but there are only 10 internal switch ports? ..so how can i set either NIC on a different VLAN?

The switch config is here:

console# show run
spanning-tree mode mstp
spanning-tree mst configuration
instance 1 add vlan 1,15,900
instance 2 add vlan 2-3
name PDSNetherlands1
revision 900
exit
spanning-tree mst 1 priority 57344
spanning-tree mst 2 priority 57344
interface port-channel 1
description 'LACPGROUP-M5316M-SW2'
exit
interface port-channel 1
switchport mode general
exit
vlan database
vlan 2-3,15,238,328-329,501,638,900
exit
interface port-channel 1
switchport general allowed vlan add 15
exit
interface port-channel 1
switchport general allowed vlan add 900
exit
interface vlan 2
name "PDS Internet"
exit
interface vlan 3
name "PDS Wireless"
exit
interface vlan 15
name "PDS ServerInfrastructure"
exit
interface vlan 238
name "SHELL GI-Desktops"
exit
interface vlan 328
name "SHELL Unix-Desktops"
exit
interface vlan 329
name "SHELL Windows-Servers"
exit
interface vlan 501
name "SHELL Linux-Desktops"
exit
interface vlan 638
name "SHELL IP-Telephony"
exit
interface vlan 900
name "PDS Workstations"
exit
interface range ethernet g(11-16)
channel-group 1 mode auto
exit
interface vlan 1
ip address 10.254.254.253 255.0.0.0
exit
ip default-gateway 10.0.0.1
logging 10.0.1.56  severity debugging facility local0
username admin password 5ebe2294ecd0e0f08eab7690d2a6ee69 level 15 encrypted
username admin_jon password ea4462b55746d29a4a0fc44c3db06b95 level 15 encrypt
ed
username administrator password 22d4734b069e91ceebdf297701005b28 level 15 enc
rypted
snmp-server community private rw
sntp client poll timer 60
sntp unicast client enable
sntp anycast client enable
sntp broadcast client enable
sntp server 64.90.182.55 poll
console#

Any help would be appreciated, I cannot complete the cluster validation wizard until i can crack this ..

Kind Regards,

Jon