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Chapter 5: Switching Commands
319
no spanning-tree
auto-edge
This command resets the auto-edge status of the port to the default value.
spanning-tree
backbonefast
Use this command to enable the detection of indirect link failures and accelerate
spanning tree convergence on PVSTP configured switches.
Backbonefast accelerates finding an alternate path when an indirect link to the
root port goes down.
Backbonefast can be configured even if the switch is configured for MST(RSTP)
or PVST mode. It only has an effect when the switch is configured for the PVST
mode.
If a backbonefast-enabled switch receives an inferior BPDU from its designated
switch on a root or blocked port, it sets the maximum aging time on the interfaces
on which it received the inferior BPDU if there are alternate paths to the
designated switch. This allows a blocked port to immediately move to the
listening state where the port can be transitioned to the forwarding state in the
normal manner.
On receipt of an inferior BPDU from a designated bridge, backbonefast enabled
switches send a Root Link Query (RLQ) request to all non-designated ports
except the port from which it received the inferior BPDU. This check validates
that the switch can receive packets from the root on ports where it expects to
receive BPDUs. The port from which the original inferior BPDU was received is
excluded because it has already encountered a failure. Designated ports are
excluded as they do not lead to the root.
On receipt of an RLQ response, if the answer is negative, the receiving port has
lost connection to the root and its BPDU is immediately aged out. If all
nondesignated ports have already received a negative answer, the whole bridge
has lost the root and can start the STP calculation from scratch.
If the answer confirms the switch can access the root bridge on a port, it can
immediately age out the port on which it initially received the inferior BPDU.
A bridge that sends an RLQ puts its bridge ID in the PDU. This ensures that it
does not flood the response on designated ports.
A bridge that receives an RLQ and has connectivity to the root forwards the
query toward the root through its root port.
Format
no spanning-tree auto-edge
Mode
Interface Config
Summary of Contents for CN1610
Page 3: ......
Page 31: ...28 Accessing the CLI ...
Page 309: ...306 Remote Monitoring Commands ...
Page 473: ...470 Port Mirroring Commands 100 ...
Page 487: ...484 DHCP L2 Relay Agent Commands Mode Privileged EXEC ...
Page 607: ...604 IPv6 Management Commands ...