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Spanning tree issue in between HP (MST) and Cisco (PVST+)

 
ytlpsnet
Occasional Contributor

Spanning tree issue in between HP (MST) and Cisco (PVST+)

Currently i have a HP 2920al switch connected as below diagram:

The problem is i keep receiving this error from Cisco switch:

Cicso_backup_root_bridge#sh spanning-tree inconsistentports

Name                 Interface                Inconsistency
-------------------- ------------------------ ------------------
VLAN0010             GigabitEthernet1/0/13    Loop Inconsistent
VLAN0050             GigabitEthernet1/0/20    Loop Inconsistent
VLAN0051             GigabitEthernet1/0/20    Loop Inconsistent
VLAN0052             GigabitEthernet1/0/20    Loop Inconsistent
VLAN0090             GigabitEthernet1/0/9     Loop Inconsistent
VLAN0090             GigabitEthernet1/0/11    Loop Inconsistent
VLAN0090             GigabitEthernet1/0/13    Loop Inconsistent
VLAN0090             GigabitEthernet1/0/15    Loop Inconsistent
VLAN0090             GigabitEthernet1/0/20    Loop Inconsistent
VLAN0090             GigabitEthernet1/0/21    Loop Inconsistent

This happened on backup root bridge, what should i configure in HP switch so that this error will not display?

1 REPLY 1
16again
Respected Contributor

Re: Spanning tree issue in between HP (MST) and Cisco (PVST+)

Hard to tell without config.  Cisco is using loopguard, and it's getting confused.  When mixing these vendors, make sure to use MST mode.