I am trying to implement the configuration shown below, but after reading some more information I am confused if better using ISL. Both devices are Cisco switches, a 3750 and 4507R. By now they will hold just one connection, a giga link, but later the 3750 will be connected to other 4507R wich is connected through a 2gigs port-channel with the first 4507R I mentioned before.
There are no issues with 802.1Q and PVST+ when using only Cisco routers: BPDUs are sent with the correct 802.1q tag and contain the Vlan-id and this provides a sanity check.
So there's no problem of only CST running this happens when connecting to a non Cisco 802.1D compliant device.
Actually the BDPUs are sent using a proprietary encapsulation and to a well-defined multicast MAC address both different then standard 802.1D so that they can travel via a 802.1D cloud (they are seen as user multicast traffic by 802.1D devices).
So stay with 802.1Q and STP will manage the link redundancy correctly on every Vlan.
I work with an ISP, and if you ask me I havent used ISL in ages, dot1Q is the way to go. It is also a standard across different vendors and it is guaranteed to work between different vendor equipments.
Also, you will find more documentation on Internet for dot1Q than ISL. Good luck...
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.