User's Manual
Table Of Contents
- 1. INTRODUCTION
- 2. INSTALLATION
- 3. SWITCH MANAGEMENT
- 4. WEB CONFIGURATION
- 4.1 System Information
- 4.2 Switch Management
- 4.2.1 Jumbo Frame
- 4.2.2 Interface
- 4.2.3 Statistics
- 4.2.4 VLAN
- 4.2.5 MAC Address
- 4.2.6 Port Mirror
- 4.2.7 Static Link Aggregation
- 4.2.8 LACP
- 4.2.9 Trunk Group Load Balance
- 4.2.10 Spanning Tree Protocol
- 4.2.11 IGMP Snooping
- 4.2.12 IGMP Filtering and Throttling
- 4.2.13 MLD Snooping
- 4.2.14 MVR For IPv4
- 4.2.14.1 Configure Global
- 4.2.14.2 Configure Domain
- 4.2.14.3 Show Configure Profile
- 4.2.14.4 Add Configure Profile
- 4.2.14.5 Show Associate Profile
- 4.2.14.6 Add Associate Profile
- 4.2.14.7 Configure Interface
- 4.2.14.8 Show Static Group Member
- 4.2.14.9 Add Static Group Member
- 4.2.14.10 Show Member
- 4.2.14.11 Show Query Statistics
- 4.2.14.12 Show VLAN Statistics
- 4.2.14.13 Show Port Statistics
- 4.2.14.14 Show Group Statistics
- 4.2.15 MVR For IPv6
- 4.2.15.1 Configure Global
- 4.2.15.2 Configure Domain
- 4.2.15.3 Show Configure Profile
- 4.2.15.4 Add Configure Profile
- 4.2.15.5 Show Associate Profile
- 4.2.15.6 Add Associate Profile
- 4.2.15.7 Configure Interface
- 4.2.15.8 Show Static Group Member
- 4.2.15.9 Add Static Group Member
- 4.2.15.10 Show Member
- 4.2.15.11 Show Query Statistics
- 4.2.15.12 Show VLAN Statistics
- 4.2.15.13 Show Port Statistics
- 4.2.15.14 Show Group Statistics
- 4.2.16 LLDP
- 4.2.17 ERPS
- 4.2.18 Loopback Detection
- 4.2.19 UDLD
- 4.2.20 Rate Limit
- 4.2.21 Storm Control
- 4.2.22 Stacking
- 4.2.23 Pepo
- 4.3 Route Management
- 4.4 ACL
- 4.5 CoS
- 4.6 Qu’s
- 4.7 Security
- 4.7.1 AAA
- 4.7.2 Web Authentication
- 4.7.3 802.1X
- 4.7.4 MAC Authentication
- 4.7.5 HTTPS
- 4.7.6 SSH
- 4.7.7 Port Security
- 4.7.8 DAI – Dynamic ARP Inspection
- 4.7.9 Login IP Management
- 4.7.10 DoS Protection
- 4.7.11 IPv4 DHCP Snooping
- 4.7.12 IPv6 DHCP Snooping
- 4.7.13 IPv4 Source Guard
- 4.7.14 IPv6 Source Guard
- 4.7.15 Application Filter
- 4.7.16 CPU Guard
- 4.8 Device Management
- 4.8.1 SNMP
- 4.8.2 RMON
- 4.8.3 Cluster
- 4.8.4 DNS
- 4.8.5 DHCP
- 4.8.6 OAM
- 4.8.7 CFM
- 4.8.7.1 Global Configuration
- 4.8.7.2 Interface Configuration
- 4.8.7.3 MD Management
- 4.8.7.4 MD Details
- 4.8.7.5 MA Management
- 4.8.7.6 MA Details
- 4.8.7.7 MEP Management
- 4.8.7.8 Remote MEP Management
- 4.8.7.9 Transmit Link Trace
- 4.8.7.10 Transmit Loopback
- 4.8.7.11 Transmit Delay Measure
- 4.8.7.12 Show Local MEP
- 4.8.7.13 Show Local MEP Details
- 4.8.7.14 Show Local MIP
- 4.8.7.15 Show Remote MEP
- 4.8.7.16 Show Remote MEP Details
- 4.8.7.17 Show Link Trace Cache
- 4.8.7.18 Show Fault Notification Generator
- 4.8.7.19 Show Continuity Check Error
- 4.8.8 Time Setting
- 4.8.9 Event Log
- 4.8.10 File Management
- 4.8.11 Ping
- 4.8.12 Trace Route
- 4.8.13 System Reboot
- 5. SWITCH OPERATION
- 6. TROUBLESHOOTING
- APPENDIX A: Networking Connection
- APPENDIX B : GLOSSARY
User’s Manual of SGS-5240 Series Managed Switch
171
4.2.18 Loopback Detection
Switch Management >Loopback Detection page is used to configure loopback detection on an interface. When loopback
detection is enabled and a port or group receives its own BPDU, the detection agent drops the loopback BPDU, sends an
SNMP trap, and places the interface in discarding mode. This loopback state can be released manually or automatically. If the
interface is configured for automatic loopback release, then the port will only be returned to the forwarding state if one of the
following conditions is satisfied:
The interface receives any other BPDU except for its own, or;
The interfaces’ link status changes to link down and then link up again, or;
The interface ceases to receive its own BPDUs in a forward delay interval.
4.2.18.1 Global Configuration
◆Status – Enables loopback detection on this interface. (Default: Enabled)
◆Trap – Enables SNMP trap notification for loopback events on this interface. (Default: Disabled)
◆Release Mode – Configures the interface for automatic or manual loopback release. (Default: Auto)
◆Release – Allows an interface to be manually released from discard mode. This is only available if the interface is configured
for manual release mode.
◆Action – Sets the response for loopback detection to block user traffic or shut down the interface. (Default: Block)
◆Transmit Interval – The duration to shut down the interface.(Range: 1-32767 seconds; Default: 60 seconds) If an interface is
shut down due to a detected loopback, and the release mode is set to “Auto,” the selected interface will be automatically
enabled when the shutdown interval has expired. If an interface is shut down due to a detected loopback, and the release mode
is set to “Manual,” the interface can be re-enabled using the Release button.