FastEthernet Subinterface Creation

[mshekhawat]

Hi..when i try to give a IP address to a subinterface in my cisco 3600 it gives me a message that "subinterface should be a part of 802.1q ,iSL, or Vlan" some messge like that..and doesnt allow me to set a IP address to it...

My cisco has the IOS Version 12.1

Pls help me ....

[waltersm]

Cisco only allows you to create FastEth subinterfaces if you're trunking VLANs..

Best way to workaround it is to set the main interface up like this:

interface FastEthernet 0

ip address 192.168.1.1 255.255.255.0

ip address 172.16.20.5 255.255.255.0 secondary

etc...

hth

-Matt

[mshekhawat]

yes!! and i think i found the problem..seems its with the IOS 12.1 i need to upgrade it to a Enterprise version where i could get the feature of encapsulation..as currently my router doesnt show up this feature...

Pls correct me if i m wrong somewhere ..

Thanks

[waltersm]

sorry - didn't see your reply before i reposted!

you just need to make sure that you need to encapsulate.. if you set encapsulation to isl or something, you will only be able to communicate with hosts that are also running isl.. PC's won't be able to talk to you.

[mshekhawat]

Thanks walter for yor responses...well one more help can u gimme some URL where i can get some good info on EtherChannel Configuration on CISCO Switches.

[waltersm]

yep - try this page out:

http://www.cisco.com/warp/public/cc/techno/media/lan/ether/channel/prodlit/faste_an.htm

-matt

[mshekhawat]

WOW !! Matt man u r genious..

thanks a TON..

Maneesh Shekhawat

[waltersm]

:)) no worries !