Why can't I see tagged packets for VLAN6 on a C2950 trunked port - ESX 4.0.0
Posted on 2010-09-08
I have a C2950 switch, using VLAN100 as mgmt VLAN. I have a server running ESX 4.0.0 on Fa0/12 with trunking enabled. There are 3 VLANs configured on this switch (let's say 5, 6 and 100, not counting 1) - VTP mode is passive, it's all manual.
switchport mode trunk
spanning-tree portfast trunk
interface vlan 100
ip address 18.104.22.168 255.255.255.0
no cdp enable
Now I can ping and see traffic on 2 out of the 3 VLANs. Can someone tell me why I can't ping a VM on the 3rd (VLAN6)? The ESX PortGroup for VLAN6 was added after initial config of the vSwitch.
This has to be simple, surely?
sh arp only displays IP+MAC for addresses learned on VLAN100. How do I debug/watch the ARP traffic on the other VLANs to see if ESX is tagging VLAN6 packets correctly?
Can someone tell me why "sh arp" shows all IP addresses from VLAN100 (mgmt VLAN) but nothing from any other active VLANs on the switch?
Many thanks - this has been a head scratcher for me for more than a day now. Too much coffee.