Technical data

24 Brocade 6910 Ethernet Access Switch Diagnostic Guide
53-1002348-02
LACP trunking
Forward Transitions : 3
Admin Edge Port : Auto
Oper Edge Port : Disabled
Admin Link Type : Auto
Oper Link Type : Point-to-point
Flooding Behavior : Enabled
Spanning-Tree Status : Enabled
Loopback Detection Status : Enabled
Loopback Detection Release Mode : Auto
Loopback Detection Trap : Disabled
Loopback Detection Action : Block
Root Guard Status : Disabled
BPDU Guard Status : Disabled
BPDU Guard Auto Recovery : Disabled
BPDU Guard Auto Recovery Interval : 300
BPDU Filter Status : Disabled
...
Configuration notes
• Changing the STP state of the primary port in a trunk group affects all ports in the trunk group.
• With RSTP, rapid convergence will not occur on ports connected to shared media devices, such
as hubs. To take advantage of the rapid convergence provided by RSTP, make sure to explicitly
configure all point-to-point links in a topology.
This command shows how to explicitly configure an interface which is attached to a LAN
segment at the end of a bridged LAN or to an end node.
Console(config)# interface ethernet 1/5
Console(config-if)# spanning-tree edge-port
Console(config-if)#
Common diagnostic scenarios
• Spanning Tree loops.
• Spanning Tree reacts to topology changes and port flapping.
• Port flapping can trigger a new Spanning Tree learning process.
LACP trunking
The Link Aggregation Control Protocol (LACP) allows ports on both sides of a redundant link to
automatically configure themselves into a trunk link (aggregate link), eliminating the need for
manual configuration. LACP has two modes:
• Active mode – When active link aggregation is enabled, the Brocade port can exchange
standard LACP Data Unit (LACPDU) messages to negotiate trunk group configuration with the
port on the other side of the link. In addition, the Brocade port actively sends LACPDU
messages on the link to search for a link aggregation partner at the other end of the link, and
can initiate an LACPDU exchange to negotiate link aggregation parameters with an
appropriately configured remote port.