The last two para says: Section 2.10 [... However, unlike in IPv4, IPv6 allows LSAs with unrecognized LS types to be labeled "Store and flood the LSA, as if type understood" (see the U-bit in Section A.4.2.1). Uncontrolled introduction of such LSAs could cause a stub area's link-state database to grow larger than its component routers' capacities. To guard against this, the following rule regarding stub areas has been established: 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. See Section 3.5 for details. ..] Two questions: 1. This term: "Store and flood the LSA, as if type understood" gives an impression that we are talking about the case when U bit is set 1 per A.4.2.1. But in the second para it talks about the case of U bit set to "0" . So which one is correct? Store and flood points to U bit is set to "1" so why it refers to U bit set to 0 in the second para? 2. In the last para it says that if the LS type is unrecognized then it may only flood when BOTH a) and b) are true. So if b) is true then a) can not be true because with U bit set to 0 you are suppose to treat the LSA as if it had a link local scope. Since a) says area OR link-local flooding scope so its partially true. The "..area scope" part is confusing. I would appreciate if someone can please clarify this. Thanks, Faraz
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