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887VA-W drops all traffic when 'switch mode trunk' enabled

Hamish Marson
Level 1
Level 1

I have an 887VAW. Only 1 interface of the fastethernet ports was connected. Up till now I just need the 1 VLAN (VLAN10), so it was configured as an access port. However needs change.

So I configured fastethernet0 with 

interface FastEthernet0
 switchport access vlan 10
 switchport trunk native vlan 10
 switchport trunk allowed vlan 1,2,101,1002-1005
 no ip address

All good so far... But when I added

interface FastEthernet0
switchport mode trunk

All traffic stopped... Weird I thought, but OK, maybe it has an issue with switching from access to trunk even though VLAN10 is the access plan AND the native when trunked.. so I found a spare port on the switch. Plugged it into FastEthernet1 and added

interface FastEthernet1
switchport trunk allowed vlan 1,2,66,1002-1005
 no ip address

VLAN66 is the new VLAN I want to use. All good so far again... Add

interface FastEthernet1
switchport mode trunk

And bang... Loss of contact on VLAN10 again...

Any ideas? Why the heck does the router stop responding to VLAN10 (Configured as)

interface Vlan10
 ip address 192.168.254.128 255.255.255.0
 ip flow ingress
 ip nat inside
 ip inspect CBAC in
 no ip virtual-reassembly in
 ip route-cache policy
 ip tcp adjust-mss 1452

when one of the ports is changed to a trunk instead of access? 

7 Replies 7

Jon Marshall
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