48 routers On Wed, Jan 3, 2024 at 11:33 AM Kevin Neal <ke...@anthembb.com> wrote:
> 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? > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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