This investigation needs a light on the network connectivity more clearly. Probabaly at this point of time, we can say HSRP might not have created the issue, because HSRP is configured at VLAN level, so chances are less. Please check if the Neighbor down logs are observed first , if so check why there was a flap in neighbor status. Also as inayath suggested have you check if there was any hike in CPU. Check if there is any crash file created.
Did you take any sh-tech output after the issue, that can help to understand the issue more clearly. At this point of time if not ospf related issue, and no changes in STP convergence time, we might not get the RCA.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...