I recieved a warning from my monitoring application that one of my serial interfaces was down for more than 5 minutes. My (buffered) logging is set to warnings (@ 20MB) but in the time period the interface was supposedly down I show nothing.
The only thing the sh log provides is a few UPDOWN state changed to UP overnight.
So how can I show the line UPDOWN notices stating UP without any corresponding UPDOWN notices stating the interface went down?
[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...