[c-nsp] IP routing on lan subinterfaces..... cisco 3550

deepak goel deepak_itbhu at hotmail.com
Thu Feb 2 23:33:33 EST 2006

hi everybody,

I am doing this on cisco 3550, the image file is 

My base interface looks like this....
interface FastEthernet0/8
no switchport
no ip address

Now I want to configure ip address on a subinterface.I have done these 

Cisco3550# configure terminal
Cisco3550(config)# interface fastEthernet0/8.1
Cisco3550(config-subif)# ip address <ip address> <netmask>

Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 
802.1Q,ISL vLAN.


I dont know how to make subinterface a part of ISL vlan (as mentioned in 
error message). There is one command  "encapsulation isl vlan-id" but i 
think that is only present on cisco routers but not on switch.

Can anybody help me in this regard


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