01-29-2008 03:03 PM - edited 03-05-2019 08:47 PM
Hi,
Is it possible to use ip unnumbered on fasteth interfaces?
With the following config, if we connect a device with 192.168.122.2/24 to FE 0/0 we are unable to ping 192.168.122.1?
interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.1
ip unnumbered FastEthernet0/1
!
interface FastEthernet0/1
ip address 192.168.122.1 255.255.255.0
duplex auto
speed auto
01-29-2008 03:21 PM
What kind of device is it and how is it connected to FA0/0?
The use of ip unnumbered was originally restricted to point to point serial interfaces. Cisco has extended the concept and now you can configure VLAN subinterfaces of a router as ip unnumbered. This presumes that the connection on the interface is a trunk. So is the device that is connected doing trunking?
HTH
Rick
01-29-2008 04:06 PM
The device currently connected to FA0/0 is simply a Laptop - We will be connecting the router(1841) to a cisco switch and running dot1q.
So, if we have somthing like:
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip unnumbered FastEthernet0/1
With vlan 10 running on switch port, and a trunk port back to 1841 FA0/0, it should work?
01-29-2008 07:56 PM
I believe that this should work.
HTH
Rick
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