OSPF
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03-07-2017 05:27 AM
I am working on a migration where i need to update the OSPF are from 0 to 3 .The network where i will be migration having area 3 configured ,so doubt at what time i need to remove the area 0 related configuration from the devices.
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Server Networking

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03-09-2017 06:54 AM
When you change the area (from 0 to 3) on one of the interfaces, the distribution router is most likely to prefer the interface in the area 0 for the prefixes learned over both interfaces since OSPF protocol dictates that intra-area route be preferred over inter-area route (for the same route).
You may have to wait for few seconds after changing the area on the core side interface (assuming the network management station is behind the core routers) to regain the connectivity. This is due to the time required for the OSPF to converge.
Manish
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