Juniper EX9200 Features Manual page 244

Spanning-Tree Protocols Feature Guide for EX9200 Switches
Action
Meaning
Purpose
Action
Meaning
228
Use the operational mode command
user@switch> show interfaces extensive ge-0/0/5
Physical interface: ge-0/0/5, Enabled, Physical link is Down
Interface index: 659, SNMP ifIndex: 639, Generation: 161
Link-level type: Ethernet, MTU: 1514, MRU: 0, Link-mode: Auto, Speed: Auto,
BPDU Error: Detected, MAC-REWRITE Error: None, Loopback: Disabled,
Source filtering: Disabled, Flow control: Disabled, Auto-negotiation: Enabled,
Remote fault: Online, Media type: Copper,
IEEE 802.3az Energy Efficient Ethernet: Disabled
Device flags : Present Running Down
Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 12 supported, 12 maximum usable queues
Hold-times : Up 0 ms, Down 0 ms
The output from the operational mode command
a is enabled.
ge-0/0/5
Verifying That BPDU Shutdown Protection Is Working Correctly
Verify that BPDU protection is working correctly in the network by checking to see whether
BPDUs have been blocked appropriately.
Issue
show interfaces extensive <interface name>
reached the two interfaces configured for BPDU protection on Switch 2:
user@switch> show interfaces extensive ge-0/0/5
Physical interface: ge-0/0/5, Enabled, Physical link is Down
Interface index: 659, SNMP ifIndex: 639, Generation: 161
Link-level type: Ethernet, MTU: 1514, MRU: 0, Link-mode: Auto, Speed: Auto,
BPDU Error: Detected, MAC-REWRITE Error: None, Loopback: Disabled,
Source filtering: Disabled, Flow control: Disabled, Auto-negotiation: Enabled,
Remote fault: Online, Media type: Copper,
IEEE 802.3az Energy Efficient Ethernet: Disabled
Device flags : Present Running Down
Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 12 supported, 12 maximum usable queues
Hold-times : Up 0 ms, Down 0 ms
When the BPDUs sent from laptops reached interface
transitioned to a BPDU inconsistent state, shutting down the interface to prevent BPDUs
from reaching the laptops.
You need to reenable the blocked interface. There are two ways to do this. If you included
the statement disable-timeout(Spanning Trees)
show interfaces extensive <interface name>
show interfaces extensive
to see what happened when the BPDUs
on Switch 2, the interface
ge-0/0/5
in the BPDU configuration, the interface
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