I have a question Regarding Section 5 of OSPF-MT < RFC SNIPPET> 5. Interoperability between MT-Capable and Non-MT-Capable Routers
The default metric field is mandatory in all LSAs (even when the metric value is 0). Even when a link or prefix does not exist in the default topology, a non-MT router will consider the zero value in the metric field as a valid metric and consider the link or prefix as part of the default topology. In order to prevent the above problem, an MT-capable router will include all links as part of the default topology. If links need to be removed from the default topology, an MT-capable router must be configured in DefaultExclusionCapability mode. In this mode, routers will ensure that all other routers in the area are in the DefaultExclusionCapability mode before considering the MT-ID#0 metric in the SPF calculation. Only then can the TOS 0 metric field in Router-LSAs be safely ignored during the default topology SPF computation. </RFC SNIPPET> Now, how does an MT-capable router automatically ensure that all other routers in the same area are also in DefaultExclusionCapability mode? If I understand correctly, one solution can be for the calculating router to ensure that the router-LSAs from all other routers in the area have the MT Option set. But then, it is not mandatory that router-LSAs MUST have MT-bit set. Is there any other solution? Thanks, - Abhijit
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