Duplicate Packets Detected on Monitoring Tool When Switches are Added to the Network
Recently I discovered that when a switch is added to the network one of our monitoring tools that is pinging a group of servers in our datacenter detects duplicate replies to ICMP requests. I used SPAN and Wireshark to verify. I suspect this ia a Spanning Tree issue ( I use Rapid PVST+) but I do not understand how this occuring in my topology. I have 2 65Ks (no VSS) at the core of my network. 1 is Root Bridge and the Other is Secondary or failover Root Bridge. Access switches are dual honed to the 65Ks with the uplink to the secondary blocked with a higher port cost. When I reboot a switch or add one to the network I see duplicate ICMP replies inicating to me that there may be a brief loop open in my network and these frames are being forwarded out different directions. I'd appreciate any help I can get in identifying this issue.
BTW I'm knew to the community. This is my 1st post.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.