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RFC 2740: When an LSA with unknow LS type having area scope and U-bit...

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Comment by Senthil K Nagappan
Submitted on 8/25/2005
Related RFC: RFC 2740
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When an LSA with unknow LS type having area scope and U-bit set to 0 is received in a stub area, 1. As per RFCPOINT2(pl see below), this should this be flooded into/throught the area2. As per RFCPOINT1(pl see below), Since the U bit is zero, it cant be stored in the area structure and so it cannt be flooded throughout the area.RFCPOINT1. As per RFC2740 section 3.5.3. Installing LSAs in the database, There are three separate places to store LSAs, depending on their flooding scope. LSAs with AS flooding scope are stored in the global OSPF data structure (see Section 3.1) as long as their LS type is known or their U-bit is 1. LSAs with area flooding scope are stored in the appropriate area data structure (see Section 3.1.1) as long as their LS type is known or their U-bit is 1. LSAs with link-local flooding scope, and those LSAs with unknown LS type and U-bit set to 0 (treat the LSA as if it had link-local flooding scope) are stored in the appropriate interface structure.RFCPOINT2. As per RFC2740 section 2.10. Stub area support, an LSA whose LS type is unrecognized may only be flooded into/throughout a stub area if both a) the LSA has area or link-local flooding scope and b) the LSA has U-bit set to 0.

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