the question is not about the use of the TAG. If you crate a routing OSPF and you need to advertise the default route you can configure the "default-information originate", and this is OK. I don't know becouse the default route is generate with a TAG number equal at the processor Id of the ospf.I don't want the TAG. I know that it is possible with a route-map to set the TAG =0. This question is only for my curiosity. What I should know is this one,why does the IOS set this TAG?
That default tag is there simply for convenience. That way, if you have multiple default routes being injected by different OSPF processes, you can easily filter them. Apart from that, there is no real reason for it. There is nothing in RFC2328 that says that it should be done this way - it's just the way Cisco has implemented it.
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Introduction The purpose of this document is to demonstrate the Open
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