I have a Fortigate100F (OS 7.0.13) with a Hardware Switch that have some interfaces, this hsw has the brige stp priority set to 12288 to act as root bridge.
- get sys stp
switch-priority : 12288
hello-time : 2
forward-delay : 15
max-age : 20
max-hops : 20
-get sys stp list
bridge 'Internal_LAN' prio 12288 mac 04:D5:90:FB:02:9A vd 'root'
root prio 12288 mac 04:D5:90:FB:02:9A cost 0
port 'port1' role designated state forward cost 20000 edge no rx 67 tx 129966
port 'port2' role designated state forward cost 20000 edge no rx 131637 tx 129974
port 'port3' role designated state forward cost 20000 edge no rx 131810 tx 129973
port 'port4' down
Here i can see that for the Fortigate perspective he is the root bridge
The port1 its connected to a ABB switch that recognize the Fortigate as his root, but in port 2 and 3 has two cisco 2960x that ignore the priority of the Fortigate and one of they assume the bridge root role.
For one of Cisco (tha assumes as bridge root)
-show spanning-tree
...for exaple for one of some vlans
VLAN0050
Spanning tree enabled protocol rstp
Root ID Priority 32818
Address 2c73.a05c.8880
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32818 (priority 32768 sys-id-ext 50)
Address 2c73.a05c.8880
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/1 Desg FWD 4 128.1 P2p Edge
Gi1/0/3 Desg FWD 19 128.3 P2p Edge
Gi1/0/23 Desg FWD 4 128.23 P2p
Gi1/0/24 Desg FWD 4 128.24 P2p
Gi1/0/25 Desg FWD 4 128.25 P2p
- show running-config
....
spanning-tree mode rapid-pvst
spanning-tree logging
spanning-tree portfast edge bpduguard default
spanning-tree extend system-id
errdisable recovery cause udld
errdisable recovery cause psecure-violation
errdisable recovery interval 120
.....
interface GigabitEthernet1/0/23
description AR-FWC-1-P3
switchport trunk native vlan 999
switchport mode trunk
spanning-tree link-type point-to-point
.....
and for the other Cisco
- show spanning-tree
.....
VLAN0050
Spanning tree enabled protocol rstp
Root ID Priority 32818
Address 2c73.a05c.8880
Cost 4
Port 46 (GigabitEthernet1/0/46)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32818 (priority 32768 sys-id-ext 50)
Address d0ec.35bc.9e00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/45 Altn BLK 4 128.45 P2p
Gi1/0/46 Root FWD 4 128.46 P2p
....
-show running-config
...
spanning-tree mode rapid-pvst
spanning-tree portfast edge bpduguard default
spanning-tree extend system-id
errdisable recovery cause udld
errdisable recovery cause psecure-violation
errdisable recovery interval 120
...
interface GigabitEthernet1/0/46
description AR-FWC-OT-ESJ-1-P2
switchport mode trunk
spanning-tree link-type point-to-point
....
I suppose thats somthing wrong with the cisco switches configuration. It could be the stp mode that is rapid-pvst???
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Hello,
Is ABB switch configured to run RPVST or other standard of STP?
The abb switch run rstp...I didn't find more detail in the manuals.
Hello,
Is it feasible to switch the other 2 switches to RSTP / MSTP?
FortiSwitch supports RPVSTP, however it is not clear whether FortiGate supports it.
https://docs.fortinet.com/document/fortiswitch/7.2.5/administration-guide/364618/support-for-interop... (FortiSwitch)
https://community.fortinet.com/t5/FortiGate/Technical-Tip-Spanning-Tree-Protocol-support-for-low-end... (FortiGate)
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