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Loopback Detection LBD Commands

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DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch CLI Reference Guide 61. Loopback Detection (LBD) Commands 61-1 loopback-detection (Global) This command is used to enable the loopback detection function globally. Use the no form of this command to disable the function globally. loopback-detection [mode {port-based | vlan-based}] no loopback-detection [mode] Parameters mode port-based vlan-based (Optional) Specifies the detection mode. Specifies that the loop detection will work in the port-based mode. Specifies that the loop detection will work in the VLAN-based mode. Default By default, this option is disabled. By default, the detection mode is port-based. Command Mode Global Configuration Mode. Command Default Level Level: 12. Usage Guideline Generally, port-based loop detection is used in ports that are connected to users, and VLAN-based detection is used in trunk or hybrid ports when the partner switch does not support the loop detection function. When doing port-based detection, the LBD enabled port will send untagged port-based LBD packets out from the port to discover the loop. If there is a loop occurrence on the path, then the packet being transmitted will loop back to the same port or to another port located on the same device. When an LBD enabled port detects a loop condition, packet transmitting and receiving is disabled at the port. When doing VLAN-based detection, the port will periodically send VLAN-based LBD packets for each VLAN that the port has membership of the VLAN is enabled for loop detection. If the port is a tagged member of the detecting VLAN, tagged LBD packets are sent. If the port is an untagged member of the detecting VLAN, untagged LBD packets are sent. If there is a loop occurrence on the VLAN path, then packet transmitting and receiving will be temporarily stopped on the looping VLAN at the port where the loop is detected. If an LBD disabled port receives an LBD packet and detects that the packet is sent out by the system itself, the sending port will be blocked if the packet is a port-based LBD packet, or the VLAN of the sending port will be blocked if the packet is a VLAN-based LBD packet. If the port is configured for VLAN-based and if the port is an untagged member of multiple VLANs, then the port will send one untagged LBD packet for each VLAN with the VLAN number specified in the VLAN field of the packet. There are two ways to recover an error disabled port. The user can use the errdisable recovery cause loopbackdetect command to enable the auto-recovery of ports that were disabled by loopback detection. Alternatively, manually recover the port by entering the shutdown command followed by the no shutdown command for the port. The VLAN being blocked on a port can be automatically recovered, if the errdisable recovery cause loopbackdetect command is configured. Alternatively, manually recover the operation by entering the shutdown command followed by the no shutdown command for the port. 608

Section	Page
Table of Contents	2
1. Introduction	5
Intended Readers	5
Other Documentation	5
Typographical Conventions	5
Notes and Cautions	5
Command Descriptions	6
Command Modes	6
User EXEC Mode at Basic User Level	7
Privileged EXEC Mode at Advanced User Level	8
Privileged EXEC Mode at Power User Level	8
Privileged EXEC Mode at Operator Level	8
Privileged EXEC Mode at Administrator Level	8
Global Configuration Mode	8
Interface Configuration Mode	8
VLAN Interface Configuration Mode	9
Creating a User Account	9
Interface Notation	10
Error Messages	10
Editing Features	11
Display Result Output Modifiers	11
2. Basic CLI Commands	13
2-1 help	13
Parameters	13
Default	13
Command Mode	13
Command Default Level	13
Usage Guideline	13
Example	14
2-2 enable	14
Parameters	14
Default	15
Command Mode	15
Command Default Level	15
Usage Guideline	15
Example	15
2-3 disable	15
Parameters	15
Default	15
Command Mode	15
Command Default Level	15
Usage Guideline	15
Example	16
2-4 configure terminal	16
Parameters	16
Default	16
Command Mode	16
Command Default Level	16
Usage Guideline	16
Example	16
2-5 login (EXEC)	16
Parameters	16
Default	16
Command Mode	16
Command Default Level	17
Usage Guideline	17
Example	17
2-6 login (Line)	17
Parameters	17
Default	17
Command Mode	17
Command Default Level	17
Usage Guideline	17
Example	18
2-7 logout	18
Parameters	19
Default	19
Command Mode	19
Command Default Level	19
Usage Guideline	19
Example	19
2-8 end	19
Parameters	19
Default	19
Command Mode	19
Command Default Level	19
Usage Guideline	19
Example	20
2-9 exit	20
Parameters	20
Default	20
Command Mode	20
Command Default Level	20
Usage Guideline	20
Example	20
2-10 show history	20
Parameters	20
Default	21
Command Mode	21
Command Default Level	21
Usage Guideline	21
Example	21
2-11 password-recovery	21
Parameters	21
Default	21
Command Mode	21
Command Default Level	21
Usage Guideline	22
Example	22
2-12 show environment	22
Parameters	22
Default	22
Command Mode	22
Command Default Level	22
Usage Guideline	23
Example	23
Display Parameters	23
2-13 show unit	23
Parameters	23
Default	23
Command Mode	23
Command Default Level	23
Usage Guideline	24
Example	24
2-14 show cpu utilization	24
Parameters	24
Default	24
Command Mode	24
Command Default Level	24
Usage Guideline	24
Example	25
2-15 show version	25
Parameters	25
Default	25
Command Mode	25
Command Default Level	25
Usage Guideline	25
Example	26
2-16 snmp-server enable traps environment	26
Parameters	26
Default	26
Command Mode	26
Command Default Level	26
Usage Guideline	26
Example	27
2-17 environment temperature threshold	27
Parameters	27
Default	27
Command Mode	27
Command Default Level	27
Usage Guideline	27
Example	27
2-18 show memory utilization	27
Parameters	28
Default	28
Command Mode	28
Command Default Level	28
Usage Guideline	28
Example	28
2-19 console-usb-timeout	28
Parameters	29
Default	29
Command Mode	29
Command Default Level	29
Usage Guideline	29
Example	29
2-20 console-usb	29
Parameters	29
Default	29
Command Mode	29
Command Default Level	29
Usage Guideline	29
Example	30
2-21 show privilege	30
Parameters	30
Default	30
Command Mode	30
Command Default Level	30
Usage Guideline	30
Example	30
3. 802.1X Commands	31
3-1 clear dot1x counters	31
Parameters	31
Default	31
Command Mode	31
Command Default Level	31
Usage Guideline	31
Example	31
3-2 dot1x control-direction	31
Parameters	31
Default	32
Command Mode	32
Command Default Level	32
Usage Guideline	32
Example	32
3-3 dot1x default	32
Parameters	32
Default	32
Command Mode	33
Command Default Level	33
Usage Guideline	33
Example	33
3-4 dot1x port-control	33
Parameters	33
Default	33
Command Mode	33
Command Default Level	33
Usage Guideline	33
Example	34
3-5 dot1x forward-pdu	34
Parameters	34
Default	34
Command Mode	34
Command Default Level	34
Usage Guideline	34
Example	34
3-6 dot1x initialize	34
Parameters	35
Default	35
Command Mode	35
Command Default Level	35
Usage Guideline	35
Example	35
3-7 dot1x max-req	35
Parameters	35
Default	35
Command Mode	36
Command Default Level	36
Usage Guideline	36
Example	36
3-8 dot1x pae authenticator	36
Parameters	36
Default	36
Command Mode	36
Command Default Level	36
Usage Guideline	36
Example	37
3-9 dot1x re-authenticate	37
Parameters	37
Default	37
Command Mode	37
Command Default Level	37
Usage Guideline	37
Example	38
3-10 dot1x system-auth-control	38
Parameters	38
Default	38
Command Mode	38
Command Default Level	38
Usage Guideline	38
Example	38
3-11 dot1x timeout	38
Parameters	39
Default	39
Command Mode	39
Command Default Level	39
Usage Guideline	39
Example	39
3-12 show dot1x	39
Parameters	39
Default	40
Command Mode	40
Command Default Level	40
Usage Guideline	40
Example	40
3-13 show dot1x diagnostics	40
Parameters	41
Default	41
Command Mode	41
Command Default Level	41
Usage Guideline	41
Example	41
3-14 show dot1x statistics	42
Parameters	42
Default	42
Command Mode	42
Command Default Level	42
Usage Guideline	42
Example	42
3-15 show dot1x session-statistics	43
Parameters	43
Default	43
Command Mode	43
Command Default Level	43
Usage Guideline	43
Example	43
3-16 snmp-server enable traps dot1x	43
Parameters	44
Default	44
Command Mode	44
Command Default Level	44
Usage Guideline	44
Example	44
4. Access Control List (ACL) Commands	45
4-1 access-list resequence	45
Parameters	45
Default	45
Command Mode	45
Command Default Level	45
Usage Guideline	45
Example	46
4-2 acl-hardware-counter	46
Parameters	46
Default	47
Command Mode	47
Command Default Level	47
Usage Guideline	47
Example	47
4-3 action	47
Parameters	47
Default	47
Command Mode	47
Command Default Level	47
Usage Guideline	48
Example	48
4-4 clear acl-hardware-counter	48
Parameters	48
Default	48
Command Mode	48
Command Default Level	48
Usage Guideline	49
Example	49
4-5 expert access-group	49
Parameters	49
Default	49
Command Mode	49
Command Default Level	49
Usage Guideline	49
Example	50
4-6 expert access-list	50
Parameters	50
Default	50
Command Mode	50
Command Default Level	50
Usage Guideline	50
Example	51
4-7 ip access-group	51
Parameters	51
Default	51
Command Mode	51
Command Default Level	51
Usage Guideline	51
Example	52
4-8 ip access-list	52
Parameters	52
Default	52
Command Mode	52
Command Default Level	52
Usage Guideline	52
Example	53
4-9 ipv6 access-group	53
Parameters	53
Default	53
Command Mode	53
Command Default Level	53
Usage Guideline	53
Example	54
4-10 ipv6 access-list	54
Parameters	54
Default	54
Command Mode	54
Command Default Level	54
Usage Guideline	54
Example	55
4-11 list-remark	55
Parameters	55
Default	55
Command Mode	55
Command Default Level	55
Usage Guideline	55
Example	55
4-12 mac access-group	56
Parameters	56
Default	56
Command Mode	56
Command Default Level	56
Usage Guideline	56
Example	56
4-13 mac access-list	57
Parameters	57
Default	57
Command Mode	57
Command Default Level	57
Usage Guideline	57
Example	57
4-14 match ip address	57
Parameters	58
Default	58
Command Mode	58
Command Default Level	58
Usage Guideline	58
Example	58
4-15 match ipv6 address	58
Parameters	58
Default	59
Command Mode	59
Command Default Level	59
Usage Guideline	59
Example	59
4-16 match mac address	59
Parameters	59
Default	59
Command Mode	60
Command Default Level	60
Usage Guideline	60
Example	60
4-17 permit \| deny (expert access-list)	60
Parameters	61
Default	62
Command Mode	62
Command Default Level	62
Usage Guideline	63
Example	63
4-18 permit \| deny (ip access-list)	63
Parameters	64
Default	65
Command Mode	65
Command Default Level	65
Usage Guideline	65
Example	65
4-19 permit \| deny (ipv6 access-list)	66
Parameters	66
Default	67
Command Mode	67
Command Default Level	67
Usage Guideline	68
Example	68
4-20 permit \| deny (mac access-list)	68
Parameters	68
Default	69
Command Mode	69
Command Default Level	69
Usage Guideline	69
Example	70
4-21 show access-group	70
Parameters	70
Default	70
Command Mode	70
Command Default Level	70
Usage Guideline	70
Example	70
4-22 show access-list	70
Parameters	71
Default	71
Command Mode	71
Command Default Level	71
Usage Guideline	71
Example	71
4-23 show vlan access-map	72
Parameters	72
Default	72
Command Mode	72
Command Default Level	72
Usage Guideline	72
Example	73
4-24 show vlan filter	73
Parameters	73
Default	73
Command Mode	73
Command Default Level	73
Usage Guideline	74
Example	74
4-25 vlan access-map	74
Parameters	74
Default	74
Command Mode	74
Command Default Level	74
Usage Guideline	74
Example	75
4-26 vlan filter	75
Parameters	75
Default	75
Command Mode	75
Command Default Level	75
Usage Guideline	75
Example	76
5. Access Management Commands	77
5-1 access class	77
Parameters	77
Default	77
Command Mode	77
Command Default Level	77
Usage Guideline	77
Example	77
5-2 banner login	77
Parameters	78
Default	78
Command Mode	78
Command Default Level	78
Usage Guideline	78
Example	78
5-3 prompt	79
Parameters	79
Default	79
Command Mode	79
Command Default Level	79
Usage Guideline	79
Example	79
5-4 enable password	79
Parameters	80
Default	80
Command Mode	80
Command Default Level	80
Usage Guideline	80
Example	80
5-5 ip http server	80
Parameters	80
Default	81
Command Mode	81
Command Default Level	81

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DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch CLI Reference Guide

608

61.

Loopback Detection (LBD) Commands

61-1

loopback-detection (Global)

This command is used to enable the loopback detection function globally. Use the

form of this command to

disable the function globally.

loopback-detection [mode {port-based | vlan-based}]

no loopback-detection [mode]

Parameters

mode

(Optional) Specifies the detection mode.

port-based

Specifies that the loop detection will work in the port-based mode.

vlan-based

Specifies that the loop detection will work in the VLAN-based mode.

Default

By default, this option is disabled.

By default, the detection mode is port-based.

Command Mode

Global Configuration Mode.

Command Default Level

Level: 12.

Usage Guideline

Generally, port-based loop detection is used in ports that are connected to users, and VLAN-based detection is

used in trunk or hybrid ports when the partner switch does not support the loop detection function.

When doing port-based detection, the LBD enabled port will send untagged port-based LBD packets out from the

port to discover the loop. If there is a loop occurrence on the path, then the packet being transmitted will loop back

to the same port or to another port located on the same device. When an LBD enabled port detects a loop

condition, packet transmitting and receiving is disabled at the port.

When doing VLAN-based detection, the port will periodically send VLAN-based LBD packets for each VLAN that

the port has membership of the VLAN is enabled for loop detection. If the port is a tagged member of the detecting

VLAN, tagged LBD packets are sent. If the port is an untagged member of the detecting VLAN, untagged LBD

packets are sent. If there is a loop occurrence on the VLAN path, then packet transmitting and receiving will be

temporarily stopped on the looping VLAN at the port where the loop is detected.

If an LBD disabled port receives an LBD packet and detects that the packet is sent out by the system itself, the

sending port will be blocked if the packet is a port-based LBD packet, or the VLAN of the sending port will be

blocked if the packet is a VLAN-based LBD packet.

If the port is configured for VLAN-based and if the port is an untagged member of multiple VLANs, then the port will

send one untagged LBD packet for each VLAN with the VLAN number specified in the VLAN field of the packet.

There are two ways to recover an error disabled port. The user can use the

errdisable recovery cause loopback-

detect

command to enable the auto-recovery of ports that were disabled by loopback detection. Alternatively,

manually recover the port by entering the

shutdown

command followed by the

no shutdown

command for the

port.

The VLAN being blocked on a port can be automatically recovered, if the

errdisable recovery cause loopback-

detect

command is configured. Alternatively, manually recover the operation by entering the

shutdown

command

followed by the

no shutdown

command for the port.