Hi, I am having a strange problem which I am sure is something simple but is driving me nuts.
I am attaching a diagram to ease the description.
Area 41 is a NSSA, all network devices in the diagram are in area 0. Core 3/4 are summarising the area 41 range.
Edge 1 is learning about this summarised range via the Metro.
Edge 2 however is learning about the summarised range via Core1 and core 2 instead of via metro 2. Both metro's are 100mb but via different providers.
Edge 2 is adjacent with Core 4 and is learning the loopback address and other Layer 3 links in area 0.
Is there some limitation that only one summarised route gets advertised out?
Both core 3 and core 4 are configured identically. Any help would be greatfully appreciated.
use the command "show ip ospf database summary" on edge2 - this will list all the lsas received and give you the advertising router along with the associated ospf cost. the output will hopefully show why the route to the summarized area 41 is via core 3 rather than core 4.
when you summarize area 41 on the ABRs are you specifying a cost?