C
HAPTER
8
| Spanning Tree Algorithm
Configuring Interface Settings for STA
– 226 –
An interface cannot function as an edge port under the following
conditions:
n
If spanning tree mode is set to STP (
), edge-port mode
cannot automatically transition to operational edge-port state using
the automatic setting.
n
If loopback detection is enabled (
) and a loopback BPDU is
detected, the interface cannot function as an edge port until the
loopback state is released.
n
If an interface is in forwarding state and its role changes, the
interface cannot continue to function as an edge port even if the
edge delay time has expired.
n
If the port does not receive any BPDUs after the edge delay timer
expires, its role changes to designated port and it immediately
enters forwarding state (see
"Displaying Interface Settings for STA"
).
u
BPDU Guard
5
– This feature protects edge ports from receiving
BPDUs. It prevents loops by shutting down an edge port when a BPDU
is received instead of putting it into the spanning tree discarding state.
In a valid configuration, configured edge ports should not receive
BPDUs. If an edge port receives a BPDU an invalid configuration exists,
such as a connection to an unauthorized device. The BPDU guard
feature provides a secure response to invalid configurations because an
administrator must manually enable the port. (Default: Disabled)
u
– BPDU filtering allows you to avoid transmitting BPDUs
on configured edge ports that are connected to end nodes. By default,
STA sends BPDUs to all ports regardless of whether administrative edge
is enabled on a port. BDPU filtering is configured on a per-port basis.
(Default: Disabled)
u
Migration
– If at any time the switch detects STP BPDUs, including
Configuration or Topology Change Notification BPDUs, it will
automatically set the selected interface to forced STP-compatible
mode. However, you can also use the Protocol Migration button to
manually re-check the appropriate BPDU format (RSTP or STP-
compatible) to send on the selected interfaces. (Default: Disabled)
W
EB
I
NTERFACE
To configure interface settings for STA:
1.
Click Spanning Tree, STA.
2.
Select Configure Interface from the Step list.
3.
Select Configure from the Action list.
4.
Modify any of the required attributes.
5. Admin Edge Port must be enabled to use this feature.
Summary of Contents for DG-GS4826S
Page 2: ...DG GS4826S DG GS4850S E012011 R01 F1 2 2 0 ...
Page 4: ......
Page 6: ...ABOUT THIS GUIDE 6 ...
Page 60: ...SECTION I Getting Started 60 ...
Page 72: ...CHAPTER 1 Introduction System Defaults 72 ...
Page 90: ...CHAPTER 2 Initial Switch Configuration Managing System Files 90 ...
Page 92: ...SECTION II Web Configuration 92 u Unicast Routing on page 539 u Multicast Routing on page 595 ...
Page 138: ...CHAPTER 4 Basic Management Tasks Resetting the System 138 ...
Page 204: ...CHAPTER 6 VLAN Configuration Configuring MAC based VLANs 204 ...
Page 212: ...CHAPTER 7 Address Table Settings Clearing the Dynamic Address Table 212 ...
Page 238: ...CHAPTER 9 Rate Limit Configuration 238 Figure 106 Configuring Rate Limits ...
Page 268: ...CHAPTER 12 Quality of Service Attaching a Policy Map to a Port 268 ...
Page 368: ...CHAPTER 14 Security Measures DHCP Snooping 368 ...
Page 422: ...CHAPTER 15 Basic Administration Protocols Remote Monitoring 422 ...
Page 488: ...CHAPTER 17 IP Configuration Setting the Switch s IP Address IP Version 6 488 ...
Page 538: ...CHAPTER 20 IP Services Forwarding UDP Service Requests 538 ...
Page 594: ...CHAPTER 21 Unicast Routing Configuring the Open Shortest Path First Protocol Version 2 594 ...
Page 624: ...CHAPTER 22 Multicast Routing Configuring PIMv6 for IPv6 624 ...
Page 638: ...CHAPTER 23 Using the Command Line Interface CLI Command Groups 638 ...
Page 712: ...CHAPTER 26 SNMP Commands 712 ...
Page 720: ...CHAPTER 27 Remote Monitoring Commands 720 ...
Page 776: ...CHAPTER 29 Authentication Commands Management IP Filter 776 ...
Page 876: ...CHAPTER 34 Port Mirroring Commands Local Port Mirroring Commands 876 ...
Page 898: ...CHAPTER 37 Address Table Commands 898 ...
Page 998: ...CHAPTER 41 Quality of Service Commands 998 ...
Page 1060: ...CHAPTER 42 Multicast Filtering Commands MLD Proxy Routing 1060 ...
Page 1078: ...CHAPTER 43 LLDP Commands 1078 ...
Page 1088: ...CHAPTER 44 Domain Name Service Commands 1088 ...
Page 1164: ...CHAPTER 47 IP Interface Commands IPv6 to IPv4 Tunnels 1164 ...
Page 1260: ...CHAPTER 48 IP Routing Commands Open Shortest Path First OSPFv3 1260 ...
Page 1304: ...SECTION IV Appendices 1304 ...
Page 1310: ...APPENDIX A Software Specifications Management Information Bases 1310 ...
Page 1343: ...DG GS4826S DG GS4850S E012011 R02 F1 2 2 0 ...
Page 1344: ......