08-09-2020 02:21 AM - edited 08-09-2020 03:01 AM
Hello,
I've the following topology
I've noticed that VLANs in the port channel (port 7 on VSS-02 nodes) are in blocking states, I believe this is not normal behavior as all links should be in forward state between both nodes.
spanning tree configuration:
VSS-01
spanning-tree mode rapid-pvst
spanning-tree portfast edge bpduguard default
spanning-tree extend system-id
spanning-tree vlan 1-4094 priority 0
VSS-02
spanning-tree mode rapid-pvst
spanning-tree portfast edge bpduguard default
spanning-tree extend system-id
spanning-tree vlan 1-4094 priority 4096
VLANs that are allowed in the trunk between both VSS nodes are:
VLAN 10, 20, 30
I have OSPF configured between both VSS nodes using VLAN 10.
Advise please.
Best Regards,
Solved! Go to Solution.
08-09-2020 02:11 PM
abimadaro4462,
The Best Practice in a setup like this is to have all 4 links in a single Multi-Chassis EtherChannel . That way it is like have two switches with one link between them.
What you have now is two switches with two links between them, passing the same VLANs over both links. I think if you change to a single 4-port MEC between the two, this will go away.
Cheers,
Scott Hodgdon
Senior Technical Marketing Engineer
Enterprise Networking Group
08-09-2020 08:00 AM
Hey!
Could you tell me what switches you exactly have and what version of code is running on them?
Then pls share the following output from both sides:
show spanning-tree blockedports show spanning-tree brief show spanning-tree summary show etherchannel summary
Thanks and br
Juls
08-09-2020 01:47 PM
08-09-2020 02:11 PM
abimadaro4462,
The Best Practice in a setup like this is to have all 4 links in a single Multi-Chassis EtherChannel . That way it is like have two switches with one link between them.
What you have now is two switches with two links between them, passing the same VLANs over both links. I think if you change to a single 4-port MEC between the two, this will go away.
Cheers,
Scott Hodgdon
Senior Technical Marketing Engineer
Enterprise Networking Group
08-10-2020 08:09 AM
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