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New Member

Secondary IP Addresses in 12.1(2)T Release


I am trying to configure secondary IP addresses on a fastethernet interface of a 3620 router.

First, my router had the IP only 12.12(5)d IOS release, I configured them and everything was fine. The addresses worked properly.

Then I load the IP/FW/IDS 12.1(2)T release and when I boot the router the secondary IP addresses were deleted. There was a message after the boot: "Secondary addresses not allowed with negotiated addresses".

I reconfigured the addresses, copied the configuration to startup config and also it was fine. But when I power off and then up the router the addresses were lost again.

I would like to know why it is happening. I think that this release has enabled some option that conflicts with the secondary addresses because I do not consider that the only solution is to reconfigure the router every time I reload the router or power off. Perhaps there is another way to configure secondary ip addresses.

Thank you.


Re: Secondary IP Addresses in 12.1(2)T Release

It sounds like the routeris trying to use dhcp to get an address on the interface--I'm not certain why this would be the default, though.


New Member

Re: Secondary IP Addresses in 12.1(2)T Release

Please have a look at CSCdt48384. There's a bug in 12.1(2)T, that deletes the secondary IP addresses upon reload. Fixed in 12.1(5)T.