I am unable to ping from R1 to R2.
debug ip packet detail returns
IP: s=172.16.12.1 (local), d=172.16.12.2 (FastEthernet0/0.12), len 100, encapsulation failed. I understand this means it can't resolve an arp address. I am looking for some guidance on what could be causing this.
I am using GNS3 to test some configurations. I have three 3725 routers. One acting as a switch (R1, R2, SW1).
ip cef is enabled on all three devices.
R2 connect to
SW1, from their
R2 have subinterfaces enabled on
f0/0.12 VLAN 12.
SW1 f1/1 &
f1/2 are both assigned to
Is there a feature on
SW1 I need to disable/enable? What am I missing?
interface FastEthernet0/0.12 encapsulation dot1Q 12 ip address 172.16.12.1 255.255.255.0
interface FastEthernet0/0.12 encapsulation dot1Q 12 ip address 172.16.12.2 255.255.255.0
interface FastEthernet1/1 switchport access vlan 12 switchport mode trunk duplex full speed 100 ! interface FastEthernet1/2 switchport access vlan 12 switchport mode trunk duplex full speed 100