
C
HAPTER
8
| Spanning Tree Algorithm
Configuring Loopback Detection
– 242 –
C
ONFIGURING
L
OOPBACK
D
ETECTION
Use the Spanning Tree > Loopback Detection page to configure loopback
detection on an interface. When loopback detection is enabled and a port
or trunk receives it’s 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 it’s own, or;
◆
The interfaces’s link status changes to link down and then link up again,
or;
◆
The interface ceases to receive it’s own BPDUs in a forward delay
interval.
N
OTE
:
If loopback detection is not enabled and an interface receives it's
own BPDU, then the interface will drop the loopback BPDU according to
IEEE Standard 802.1w-2001 9.3.4 (Note 1).
N
OTE
:
Loopback detection will not be active if Spanning Tree is disabled on
the switch.
N
OTE
:
When configured for manual release mode, then a link down/up
event will not release the port from the discarding state.
CLI R
EFERENCES
◆
"Spanning Tree Commands" on page 1091
P
ARAMETERS
These parameters are displayed:
◆
Interface
– Displays a list of ports or trunks.
◆
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)
Содержание ECS4110-28T
Страница 1: ...Management Guide www edge core com ECS4110 28T 28P 52T 52P 28 52 Port Gigabit Ethernet Layer 2 Switch...
Страница 2: ......
Страница 4: ......
Страница 63: ...FIGURES 63 Figure 428 Configuring VLAN Translation 1177...
Страница 64: ...FIGURES 64...
Страница 72: ...TABLES 72...
Страница 74: ...SECTION I Getting Started 74...
Страница 102: ...SECTION II Web Configuration 102 General IP Routing on page 679...
Страница 154: ...CHAPTER 4 Basic Management Tasks Resetting the System 154...
Страница 198: ...CHAPTER 5 Interface Configuration VLAN Trunking 198 Figure 65 Configuring VLAN Trunking...
Страница 272: ...CHAPTER 9 Congestion Control Automatic Traffic Control 272...
Страница 286: ...CHAPTER 10 Class of Service Layer 3 4 Priority Settings 286...
Страница 420: ...CHAPTER 13 Security Measures DHCP Snooping 420...
Страница 566: ...CHAPTER 14 Basic Administration Protocols OAM Configuration 566...
Страница 638: ...CHAPTER 15 Multicast Filtering Multicast VLAN Registration for IPv6 638...
Страница 662: ...CHAPTER 16 IP Configuration Setting the Switch s IP Address IP Version 6 662...
Страница 678: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 678...
Страница 792: ...CHAPTER 21 System Management Commands Switch Clustering 792...
Страница 822: ...CHAPTER 23 Remote Monitoring Commands 822...
Страница 888: ...CHAPTER 24 Authentication Commands PPPoE Intermediate Agent 888...
Страница 968: ...CHAPTER 25 General Security Measures Port based Traffic Segmentation 968...
Страница 994: ...CHAPTER 26 Access Control Lists ACL Information 994...
Страница 1034: ...CHAPTER 28 Link Aggregation Commands Trunk Status Display Commands 1034...
Страница 1044: ...CHAPTER 29 Power over Ethernet Commands 1044...
Страница 1084: ...CHAPTER 33 UniDirectional Link Detection Commands 1084...
Страница 1090: ...CHAPTER 34 Address Table Commands 1090...
Страница 1194: ...CHAPTER 37 VLAN Commands Configuring Voice VLANs 1194...
Страница 1388: ...CHAPTER 42 CFM Commands Delay Measure Operations 1388...
Страница 1410: ...CHAPTER 44 Domain Name Service Commands 1410...
Страница 1420: ...CHAPTER 45 DHCP Commands DHCP Relay 1420...
Страница 1472: ...CHAPTER 46 IP Routing Commands IPv4 Commands 1472...
Страница 1474: ...SECTION IV Appendices 1474...
Страница 1502: ...COMMAND LIST 1502...
Страница 1513: ......
Страница 1514: ...ECS4110 28T ECS4110 28P ECS4110 52T ECS4110 52P E072014 ST R02 150200000929A...