I have enabled IP DHCP snooping on 2 switches that are connetced to each other via an etherchannel using 2 ports. On switch 1 it has the DHCP pool, but users on the 2nd switch couldn't get DHCP addresses eventough I added the "ip dhcp snooping trust" command on both pots in the ehterchannel either side and the "no ip dhcp snooping information option".
What fixed it was adding the "ip dhcp snooping trust" commad on the port channel which I have never had to do before is this normal?
in simple terms, DHCP snooping allows a (edge)port to receive DHCP client traffic, which is Discover, Request, Release, Inform.
Received DHCP server traffic like Offer and Ack is dropped by DHCP snooping by default in order to prevent from rogue DHCP servers, so the real serverport(s) and the uplinks as well have to be trusted in order to allow DHCP server traffic (as the uplinks receive client- and server traffic).
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.