The log message indicates that the FastEthernet interface went down and came back up. The fact that the standby status of the subinterfaces changed from standby to active is consistent with the interface going down and coming back up. And the change in the OSPF neighbors is consistent with an interface failure. The suggestion to check the other switch to see if it recorded similar issues is a good place to start.
Without knowing more about your topology and what is connected in the various VLANs (are there layer 3 devices other than the 3550 in some of the VLANs running OSPF?) we are not in a good position to adivse whether making the subinterfaces passive in OSPF would be good or not.
the log lines you have attached show that interface fas8/1/1 failed line protocol down and line protocol up.
The OSPF adjacency failed and then recovered.
There are no timestamps: so we cannot say how long after interface fas4/1/0 and its subinterfaces experienced the change of state in HSRP and in OSPF.
IF this happened just after the fas8/1/1 had an up/down my guess is that if the first interface is connected to a switch port that is not configured for STP portfast the change of state caused a topology change and STP had to recalculate.
As a side effect during STP recalculation HSRP and OSPF failed on another router interface connected to the same switch or to other switch in the same campus.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...