Cisco Router AUX Port – How to Connect from Switch Ethernet Port

I haven't understood if you are or are not able to access the console when the device is not working. If you cannot access the console, it looks bad. Adding a syslog server is a very good idea, the device might send something prior to crashing.

Check if the IOS you are running is fine or deprecated due to problems and upgrade accordingly.

Usually such behavior is a good reason to open a tac case at cisco, provided you still have some support contract.

1. Yes, it is possible.

2. You are doing something wrong, most likely tagging frames on the router but the trunk has VLAN 1 as native.

To confirm what your trunking settings are use:

show interfaces trunk

I like to keep the subinterface IDs matching the VLAN number although it is not required. Use a configuration like:

! Switch
! Port to Laptop
interface Fax/x
switchport mode access
switchport access vlan 1
spanning-tree portfast
description Port to PC
! Port to Netgear
interface Fax/x
switchport mode access
switchport access vlan 1
spanning-tree portfast
description Port to Netgear
! Port to Cisco router
interface Fax/x
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast trunk
description port to Cisco router

For the router:

! Router
! Port to switch
interface E0/0.1
encapsulation dot1q 1 native
ip add 192.168.0.70 255.255.255.0
description VLAN1 to Netgear
interface E0/0.10
encapsulation dot1q 10
ip add 192.168.10.70 255.255.255.0
description VLAN10
interface E0/0.20
encapsulation dot1q 20
ip add 192.168.20.70 255.255.255.0
description VLAN20
ip routing
ip route 0.0.0.0 0.0.0.0 192.168.0.1

Obviously replace IP with your desired IP in the subnet.