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I'm doing a lab for my internetworking course and I'm using GNS3 as the emulator. I can configure single FastEthernet interfaces on each router but I need to have two per router. I am using the c7200 image and router.

This is my attempt to configure the router.

Router>enable Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#interface f0/0 Router(config-if)#ip address 172.16.1.1 255.255.255.192 Router(config-if)#no shutdown Router(config-if)#exit Router(config)#interface f0/1 ^ % Invalid input detected at '^' marker.

Router(config)#

Every time I try to do the f0/1 interface I get the invalid input detected message.

WHY?!!?

Any help would be appreciated, thanks :-)

shans91
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2 Answers2

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It seems the interface FastEthernet0/1 does not exist ?

Use the command Router#show ip interface brief, to verify that the interface exists.

If it doesn't exist, in GNS3 you can add additional interfaces through the configure option menu of the router(slots tab).

scape
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i had the same problem. right click on router, click on configure, go to slots, click on slot 0, choose the second on (2FE). apply, and ok, now u have 2 FastEthernet interfaces.

Dela
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