09-23-2020 10:03 AM
Hello,
I build a new network loop.
1st : I have 2 switchs linked with stack (9300), and 8 GBIC per switch.
2nd : I have many other switchs with 2 GBIC per switch.
I create a fiber network :
-----
9300_Nb1 (gbic_3) >>
gbic_25 : 2960-X : gbic_27 >>
gbic_25 : 2960-X : gbic_27 >>
gbic_25 : 2960-X : gbic_27 >>
9300_Nb2 (gbic_3)
------
9300_Nb1 <<STACK>> 9300_Nb2
I try to configure the spanning-tree with many commands; but each time I close the loop, the CPU of the STACK go to 100 % after 30 seconds; very bad.
What are the mandatory commands to resolve the problem ?
Regards,
09-23-2020 10:55 AM
Actions :
1st : Update all the firmware of the 2960-X
2nd : Command on all the 5 switches:
---
enable
conf t
spanning-tree bpduguard enable
spanning-tree mode rapid-pvst
spanning-tree VLAN 2,3,4,5
---
On the first switch 9300 :
spanning-tree vlan 2-5 root primary
---
On 9300_Nb1 (port gbic_3) :
spanning-tree vlan 2-5 port-priority 64
---
On the other switches 2960-x :
spanning-tree vlan 2-5 root secondary
---
on each 2960-X (ports gbic 25 and 27) :
spanning-tree vlan 2-5 port-priority 128
---
What the missing or wrong commands ?
09-23-2020 12:32 PM
It seems that this command can apply the priority to on switch :
spanning-tree vlan vlan-id priority priority
09-23-2020 12:43 PM
My feeling is that this Trunk port is not "Blocked" automatically.
9300_Nb2 (gbic_3)
Why ?
Because the other Trunk ports are not in "Forwarding" mode ?
How to do that ?
09-23-2020 12:45 PM
Do you have any high-level network diagram and share the configuration ?
09-23-2020 01:48 PM
Hello,
I can share, tomorrow, the configuration of each Trunk Port, for each switch.
----
The very simple diagram is like that
9300_Nb1 <<STACK>> 9300_Nb2
I create a fiber network :
-----
9300_Nb1 (gbic_3) >> << gbic_25 2960-X_Nb1 gbic_27 >> << gbic_25 2960-X_Nb2 gbic_27 >> << gbic_25 2960-X_Nb3 gbic_27 >>XXX 9300_Nb2 (gbic_3)
------
Without the "shut" XXX on the port " 2960-X_Nb3 : gbic_27 ",
I have a lot of Broadcast Storm ...
Regards,
09-23-2020 01:51 PM
Hello,
I can share, tomorrow, the configuration of each Trunk Port, for each switch.
----
The very simple diagram is like that
9300_Nb1 <<STACK>> 9300_Nb2
I create a fiber network :
-----
9300_Nb1 (gbic_3) >> << gbic_25 2960-X_Nb1 gbic_27 >> << gbic_25 2960-X_Nb2 gbic_27 >> << gbic_25 2960-X_Nb3 gbic_27 >>XXX 9300_Nb2 (gbic_3)
------
Without the "shut" XXX on the port " 2960-X_Nb3 : gbic_27 ",
I have a lot of Broadcast Storm ...
Regards,
09-29-2020 07:30 AM
description Trunk vers SW2
switchport trunk native vlan 50
switchport trunk allowed vlan 50,51,52,53,54
switchport mode trunk
storm-control broadcast level 10.00
spanning-tree portfast
spanning-tree bpdufilter enable
spanning-tree bpduguard enable
spanning-tree guard loop
spanning-tree vlan 50,51,52,53,54 port-priority 64
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide