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Generic Troubleshooting in Dshell Troubleshooting Spanning Tree
page 4-16 OmniSwitch Troubleshooting Guide September 2005
The Port VLAN blocking message sent to the Source Learning NI has the following structure:
uint16 VlanId, uint32 PortVector
This event has the following values for the message ID:
• appID: APPID_SPANNING_TREE.
• subMsgNum: STP_PortVlanBlocking.
These event fields are defined below:
• VlanId: A value 1 to 4095 identifies a VLAN (0 means that the message is applied to ports defined by
the PortVector on all VLANs).
• PortVector: A field of bits, one bit by the physical port, which indicates if the port is concerned by the
change of state.
GMBPDU
This message is sent by the Spanning tree NI to the local Group Mobility NI each time a BPDU is received
on a mobile port. Group mobility can take two actions depending on how the mobile port has been config-
ured:
• Ignore BPDU: In this case Spanning Tree will keep on sending GMBPDU each time a BPDU will be
received on the port (there is no Spanning Tree computation for the port).
• Move port to fixed: Group Mobility asks Spanning Tree to revert the mobile port to the fixed state and
the port will be added to Spanning Tree associated to VLAN 1.
The BPDUonMobPort message sent by the Spanning Tree NI has the following format:
uint8 LocalPortId, uint8 bpdu_lgth, uint8 bpdu_data[STP_BPDULGTH]
This event has the following values for the message ID:
• appID: APPID_SPANNING_TREE
• subMsgNum: STP_BPDUonMobPort
These event fields are defined below:
• LocalPortId: Identifies the physical Port (local reference: 0 to 23) which received the BPDU.
• bpdu_lgth: The length in bytes of the following BPDU.
• bpdu_data: The BPDU.
GMIGBPDU
This message is sent by Group Mobility NI in response to a BPDU on mobile port message sent by the
Spanning Tree. By sending this message group mobility tells to Spanning Tree to ignore BPDU on the
mobile port.
The single parameters is:
• First parameter: The global port identifier.