Hello there, Quite simple, really :-) DN-bit is set on this LSA: >> OSPF AS SCOPE link state database >> Type ID Adv Rtr Seq >> Age Opt Cksum Len >>Extern 0.0.0.0 10.11.232.17 0x80000003 >>1306 0x82 0xf70 36 Opt 0x82 means DN-bit and E-bit are set. PE router won't install the LSA with DN-bit set, see RFC4576. Cheers Alex