Understanding Bpdu Protection For Stp, Rstp, And Mstp On Ex Series; Configuring Spanning-Tree Protocols - Juniper JUNOS OS 10.3 - SOFTWARE Manual

CHAPTER 66

Configuring Spanning-Tree Protocols

Unblocking an Interface That Receives BPDUs in Error (CLI Procedure)
Related
Documentation
Copyright © 2010, Juniper Networks, Inc.
Unblocking an Interface That Receives BPDUs in Error (CLI Procedure) on page 1579
Configuring STP (CLI Procedure) on page 1580
Configuring Spanning-Tree Protocols (J-Web Procedure) on page 1580
Configuring VLAN Spanning Tree Protocol (CLI Procedure) on page 1584
EX Series switches use bridge protocol data unit (BPDU) protection on interfaces to
prevent them from receiving BPDUs that could trigger a spanning-tree misconfiguration.
If BPDUs are received on a BPDU-protected interface, the interface transitions to a
blocking state and stops forwarding frames.
After the misconfiguration that triggered the BPDUs being sent to an interface is fixed in
the topology, the interface can be unblocked and returned to service.
To unblock an interface and return it to service using the CLI:
Automatically unblock an interface by configuring a timer that expires (here, the
interface is ):
ge-0/0/6
[edit ethernet-switching-options]
user@switch# set bpdu-block disable-timeout 30 interface ge-0/0/6
Manually unblock an interface using the operational mode command:
user@switch> clear ethernet-switching bpdu-error interface ge-0/0/6
Example: Configuring BPDU Protection on STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1561
Example: Configuring BPDU Protection on non-STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1565
Understanding BPDU Protection for STP, RSTP, and MSTP on EX Series Switches on
page 1522
1579