48 to 24 port switch

Unanswered Question
Apr 9th, 2008

just for a curiosity

what will happen if I upload 48 port switch configuration to a 24 port switch using TFTP.

I want to know will the VLAN configuration would work i.e. only for the port applied on the Switch.

I could do this myself but just to save time if any one has experience this kind of thing.



I have this problem too.
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Kevin Dorrell Wed, 04/09/2008 - 06:14

It will interpret it line by line, making the best it can.

If you upload to the running config, it will give you error messages for the additional 24 port configs, and effectively ignore them.

If you upload to the start config, then it will not say anything until you reload, and then it will give the error messages for the additional 24 ports.

The operation should be fairly harmless; the first time it specifies an invalid interface it will go into global config mode, at which point it should error any interface-specific commands. But if you have any commands that mean something in both modes, you may find it has changed some global settings you were not expecting.

I would suggest you edit the file before the TFTP ;-)

Kevin Dorrell


syedumairali Thu, 04/10/2008 - 01:12

Thanks Kevin for valuable comments now one more thing,

for VLANS configuration, if 48 port switch was configured with vlan 10 for port 1, 2, 31 ,35, my question is, will VLAN 10 contains port 31 and 35 on 24 port switch ?


Kevin Dorrell Thu, 04/10/2008 - 01:28


No, it won't. It will read the config file line by line, so when it sees interface FastEthernet 0/31 it will error and stay on global config mode. In that mode, the switchport access vlan 10 will be meaningless, so it will just give an error message and ignore the command.

Kevin Dorrell



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