Clearing loop-detection
To clear loop detection statistics and re-enable all ports that are in Err-Disable state because of a loop
detection, enter the
clear loop-detection
command.
device# clear loop-detection
Displaying loop-detection information
Use the
show loop-detection status
command to display loop detection status, as shown.
device# show loop-detection status
loop detection packets interval: 10 (unit 0.1 sec)
Number of err-disabled ports: 3
You can re-enable err-disable ports one by one by "disable" then "enable"
under interface config, re-enable all by "clear loop-detect", or
configure "errdisable recovery cause loop-detection" for automatic recovery
index port/vlan status #errdis sent-pkts recv-pkts
1 1/13 untag, LEARNING 0 0 0
2 1/15 untag, BLOCKING 0 0 0
3 1/17 untag, DISABLED 0 0 0
4 1/18 ERR-DISABLE by itself 1 6 1
5 1/19 ERR-DISABLE by vlan 12 0 0 0
6 vlan12 2 ERR-DISABLE ports 2 24 2
If a port is errdisabled in Strict mode, it shows "ERR-DISABLE by itself". If it is errdisabled due to its
associated vlan, it shows "ERR-DISABLE by vlan ?"
The following command displays the current disabled ports, including the cause and the time.
device# show loop-detection disable
Number of err-disabled ports: 3
You can re-enable err-disable ports one by one by "disable" then "enable"
under interface config, re-enable all by "clear loop-detect", or
configure "errdisable recovery cause loop-detection" for automatic recovery
index port caused-by disabled-time
1 1/18 itself 00:13:30
2 1/19 vlan 12 00:13:30
3 1/20 vlan 12 00:13:30
This example shows the disabled ports, the cause, and the time the port was disabled. If loop-detection
is configured on a physical port, the disable cause will show "itself". For VLANs configured for loop-
detection, the cause will be a VLAN.
The following command shows the hardware and software resources being used by the loop-detection
feature.
Vlans configured loop-detection use 1 HW MAC
Vlans not configured but use HW MAC: 1 10
alloc in-use avail get-fail limit get-mem size init
configuration pool 16 6 10 0 3712 6 15 16
linklist pool 16 10 6 0 3712 10 16 16
Displaying loop detection resource information
Use the
show loop-detection resource
command to display the hardware and software resource
information on loop detection.
device# show loop-detection resource
Vlans configured loop-detection use 1 HW MAC
Vlans not configured but use HW MAC: 1 10
alloc in-use avail get-fail limit get-mem size init
configuration pool 16 6 10 0 3712 6 15 16
linklist pool 16 10 6 0 3712 10 16 16
Clearing loop-detection
FastIron Ethernet Switch Administration Guide
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