Going Deep on OSPF Route Filtering

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. Mason’s Blog - https://masonreimert.com/ OSPF Filtering Lab - https://masonreimert.com/2024/05/15/o... Cisco SD-Access Lab Workbook - https://masonreimert.com/2024/06/17/1... Heavy Networking is the flagship show of the Packet Pushers network. Visit our website to find more great networking and technology podcasts, along with tutorial videos, the Human Infrastructure newsletter, and loads more resources for building your IT career. https://packetpushers.net