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OSPF Problem Scenarios Virtual Links – Can decide to send traffic to a different router than indicated by the backbone topology. Traffic path traversed is not known based on backbone SPT. Alternate ABRs – If inter-area routes are learned from multiple areas, then traffic path may exit and re-enter area. Multi-area ASBRs – If an ASBR announces its location into multiple non-backbone areas, then other ABRs also in two or more of those non-backbone areas can cost-based decision between intra-area paths from different areas. AS External Routes – If same route is advertised with same type metric from forwarding addresses (or ASBRs) in different non-backbone areas connected by at least one ABR, then that ABR has decision between intra-area paths from different areas. |