I have two 6509-E switches using portcahnnel. The second switch continues to learn all zero mac and sends it out to some of my access switches. The only sniffer captures I can find show up as Fiber Channel Protocol. Has anyone seen this? Cisco TAC say's could be a bad NIC or NIC teamng, to find the culprit is process of elimination on switch modules. Any traces I have done only shows source mac of zeros no dest mac.
I have run across this and it turned out to be a bad NIC. If I remember correctly the all zero's mac address means the router does not know what the mac address is. I tracked it down by elimination and removed it, swapped the NIC and all was well again.
This output is quite unusual, not because switch is learning all zero MAC, but the way it is learnt. The output states it's learnt dynamically, however port is still displayed as "Router".
Also, we see it in more than 1 Vlan, so this is certainly coming from a device with multiple L3 interfaces (SVI) configured. Can you share the sniffer traces and specify the interface of which it was taken? Also, let me know the IOS version used + "Sh module" output from both the 6500 switches.
Also check, if any PO interfaces have the mac set as all zero's, via the "sh interface po <>" CLI. Do you have a TAC case opened for this?
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
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...