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: [image: VL_Loop.PNG] 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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