I have 2 equal-cost paths to a network. Both have the same admin distance (110 for ospf) and metric, and they're both O routes. However, only one appears in the r-t at any one time. Does anyone know why this would be? They're pointing to 2 different vlan interfaces - but surely that doesn't make a difference?
Also, as an aside, would OSPF choose an O route over and O IA? And is there anyway to change this behaviour?
in addition to Satish?s post, if both your equal cost routes are ?O? routes, OSPF should automatically put them in the routing table. You might want to try and add the interface command `ip ospf cost 1000? to both your VLAN interfaces. If that still does not get you the desired result, could you post the configuration of the router ?
Regarding your other question: within the same OSPF process, the rule of preference:
intra-area routes (O)
interarea routes (O IA)
external routes type 1 (O E1)
external routes type 2 (O E2)
cannot be changed, that is, an O IA route will never be preferred over an O route. That behaviour cannot be changed. If you add another OSPF process (e.g. ?router ospf 2? in addition to ?router ospf 1?), only the metrics and administrative distance of the respective routes are being compared, not the route type.
Satish, I will investigate what method is being used on the router. It's weird because these routes used to be advertised over tunnels, which did balance and the only thing that's changed is that they're now point to point links in different vlans.
GP, I understand, that is a useful work around, thank you.
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