How many total routers do you have in the OSPF area? We ran into a similar issue and ended up having to segregate portions of our network into separate OSPF Areas to bring stability back. There's a wall you'll hit when topology changes occur and the routers can't keep up with route updates, it's not just a # of routes in a single area, it's the combination. The symptom is that some routes aren't installed on some routers.
In your case it may be that the router lost its default, or, more likely an upstream router didn't install the downstream route. We had this where on a single router with multiple routes, some would work and others wouldn't. -Kevin ________________________________ From: AF <af-boun...@af.afmug.com> on behalf of castarritt <castarr...@gmail.com> Sent: Wednesday, January 3, 2024 9:08 AM To: af@af.afmug.com <af@af.afmug.com> Subject: EXTERNAL - [AFMUG] Odd routing issue CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Please report all suspicious emails to info...@anthembusinessgroup.com as an attachment. Had an odd issue last night. All 'tik OSPF routed network with routers at each tower site. Simple single area OSPF setup, no MPLS or other overlay, about 700 internal routes. Last night, some customers on APs connected to specific tower routers lost connection to the internet. Our monitoring system never lost connection to any of the customer SMs or anything else in our network, so no alarms were raised. The issue lasted a few hours overnight and recovered on its own without any of us getting to take a look at it. It is like the affected routers lost their dynamic default route. The affected routers appear to be randomly scattered around our network. They aren't all connected along the same backhaul paths, and in one case where we had two routers at a specific site, only one of the routers was affected. This happened at the tail end of a heavy rain storm that was causing a lot of OSPF topology changes as microwave links went in and out of service due to rain fade. Anyone else seen something like this? Is our routing table getting too big for 'tik to handle with a single OSPF area?
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