I'm seeing mutiple root bridges for each vlan across our network. We have multiple switch stacks which connect to our two core switches. We are also runing vtp across the LAN so each switch has 25 vlans in it vlan database.
On the trunk ports which connect from the core switches to the switch stacks we only allow the required vlan for the switch stack. Because we restrict the vlans on the trunk ports does this mean each switch stack will need a root bridge for the vlans which are not allowed across the trunk ports which connect to the cores. Also would it be best practice to disable VTP?
Re: Spanning Tree - Mutliple Root Bridges per VLAN
Yes. The vlan should be in the list of allowed on both side, otherwise the STP domain is split in multiple pieces, that is why you see multiple STP root switches: the access switch doesn't see the distribution switch (vlan is not allowed on its trunk ports), so its each access thinks: hey, then i am the root.
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.