Hi Sergey, I don’t see why RT_1 wouldn’t go through ABR_1 to get to the ASBR. Thanks, Acee
From: Lsr <lsr-boun...@ietf.org> on behalf of Sergey SHpenkov <sergey.v.shpen...@gmail.com> Date: Tuesday, February 25, 2020 at 2:38 PM To: "lsr@ietf.org" <lsr@ietf.org> Subject: [Lsr] Question about OSPF (transit area routing loop) Hi, In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR routers connected to a transit area are required to check the sumLSA contained within this area in order to possibly improve the intra-area and inter-area backbone routes for themselves. See the picture: [cid:image001.png@01D5EBEA.1BF45650] The RT_1 and ABR_3 routers will use different paths to the ASBR router: ABR_3 -> RT_1 -> ABR_1 -> ASBR = cost 3 RT_1 -> ABR_3 -> ABR_2 -> ASBR = cost 21 route loop between RT_1 and ABR_3 Please explain this situation Thanks, Sergey
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