Hi!
We're having a mixed swich-environment and the core exists of tree stacked Dell 62xx-switches.
We used to have a Cisco switch that has now been replaced by the third stacked 6248 switch.
The Cisco switch had the following configuration on the port that connected the switch to our ISP:
switchport access vlan 3
switchport mode access
spanning-tree portfast
spanning-tree bpdufilter enable
spanning-tree bpduguard enable
---
We moved the internet access to the Dell switch with the following config
Global:
spanning-tree portfast bpdufilter default
spanning-tree bpdu-protection
spanning-tree mode mstp
The Port:
spanning-tree auto-portfast
switchport access vlan 3
Witch ended in a disaster, since the ISP is clearly sending out a lot of spanning-tree info it probably shouldn't have sent to us (many topology changes happened after the moving of this connection).
Reading it looks like the "spanning-tree tcnguard" could have saved us here. Whats the recommended configuration for this ISP port that that we don't want to be able to participate in our spanning-tree environment.