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On today’s episode we delve into OSPF filtering. That is, how to filter routes from a device’s routing table in an OSPF environment. This is a tricky business, because OSPF requires an identical database on every device in an OSPF area. That means you can’t stop announcing a route from one OSPF router because you don’t want that route to show up on that router or in downstream routers. OSPF routers go through a database synchronization process to ensure that they are identical, so that when they run their shortest-path-first algorithm, they all come up with the same answers--the same paths through the OSPF area. Different OSPF databases would cause OSPF routing chaos. And yet! There are times where you don’t want a route to show up in a specific OSPF router, or want to filter a route eimfrom an entire OSPF area. Is this possible? Are there stupid router tricks you can perform that might help you filter a route, despite OSPF’s inherent nature? To help us answer these questions today is Mason Reimert. Mason is a network engineer and CCIE candidate who did a recent write up on OSPF filtering on his tech blog. Listen here or wherever you get your podcasts - https://lnkd.in/g5_URaCv

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