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Known issue with 2821 router , IOS c2800nm-adventerprisek9-mz.124-15.T5

I am having a problem configuring 802.1X and a cisco IP phone on a Cisco 2821 router with IOS c2800nm-adventerprisek9-mz.124-15.T5.

When i configure 802.1X without connecting the IP phone, the router accepts the config , but the phone does not work when i connect it.

When i connect the phone before configuring the 802.1X the router does not accept this config.

I am working with Voice and data vlan.

Does anybody know of a bug in the sofware or something?

The should support the features according to the feature navigator.

Thanks a lot in advance

1 REPLY
Super Bronze

Re: Known issue with 2821 router , IOS c2800nm-adventerprisek9-m

Can't guarantee this will help, but you might try upgrading the IOS to 12.4(15)T7 or 12.4(20)T.

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