218
C
HAPTER
27: DLDP C
ONFIGURATION
Link Auto-recovery
Mechanism
If the shutdown mode of a port is set to auto shutdown, the port is set to the
DLDP down state when DLDP detects the link connecting to the port is a
unidirectional link. A port in DLDP down state does not forward service packets or
receive/send protocol packets except DLDPDUs.
A port in the DLDP down state recovers when the corresponding link recovers. A
port in the DLDP down state sends recover probe packets periodically. On receiving
a correct recover echo packet (which means that the unidirectional link is restored
to a bidirectional link), it is brought up by DLDP. The detailed process is as follows.
1
A port in the DLDP down state sends a recover probe packet every 2 seconds.
Recover probe packets carry only the local port information.
2
Upon receiving a recover probe packet, the peer end responds with a recover echo
packet.
3
Upon receiving a recover echo packet, the local end checks to see if the neighbor
information carried in the recover echo packet is consistent with that of the local
port. If yes, the link between the local port and the neighbor is considered to be
recovered to bidirectional, the port changes from the disable state to the active
state, and neighboring relationship is reestablished between the local port and the
neighbor.
n
Only ports in the DLDP down state can send and process recover probe packets
and recover echo packets. The auto-recovery mechanism does apply to ports that
are shut down manually.
DLDP Configuration
Configuring DLDP
n
For a port with DLDP enabled, you are not recommended to execute the
port
monitor last
command on the port. If it is necessary, the value argument in this
command must be less than 10.
The following table describes the DLDP configuration tasks:
Table 150
DLDP configuration tasks
Operation
Command
Descriptio
n
Enter system view
system-view
-
Enable DLDP
Enable DLDP globally
dldp enable
Required.
Enable
DLDP
globally
and then
enable
DLDP on
the
specified
port.
Enable DLDP
on a port
Enter Ethernet
port view
interface
interface-type
interface-number
Enable DLDP on a
port
dldp enable
Summary of Contents for Switch 7754
Page 32: ...32 CHAPTER 1 CLI OVERVIEW ...
Page 70: ...70 CHAPTER 5 LOGGING IN USING MODEM ...
Page 76: ...76 CHAPTER 7 LOGGING IN THROUGH NMS ...
Page 86: ...86 CHAPTER 9 CONFIGURATION FILE MANAGEMENT ...
Page 120: ...120 CHAPTER 13 ISOLATE USER VLAN CONFIGURATION ...
Page 126: ...126 CHAPTER 14 SUPER VLAN ...
Page 136: ...136 CHAPTER 16 IP PERFORMANCE CONFIGURATION ...
Page 152: ...152 CHAPTER 17 IPX CONFIGURATION ...
Page 164: ...164 CHAPTER 19 QINQ CONFIGURATION ...
Page 172: ...172 CHAPTER 21 SHARED VLAN CONFIGURATION ...
Page 182: ...182 CHAPTER 22 PORT BASIC CONFIGURATION ...
Page 198: ...198 CHAPTER 24 PORT ISOLATION CONFIGURATION ...
Page 208: ...208 CHAPTER 25 PORT SECURITY CONFIGURATION ...
Page 224: ...224 CHAPTER 27 DLDP CONFIGURATION ...
Page 232: ...232 CHAPTER 28 MAC ADDRESS TABLE MANAGEMENT ...
Page 240: ...240 CHAPTER 29 CENTRALIZED MAC ADDRESS AUTHENTICATION CONFIGURATION ...
Page 280: ...280 CHAPTER 30 MSTP CONFIGURATION ...
Page 348: ...348 CHAPTER 35 IS IS CONFIGURATION ...
Page 408: ...408 CHAPTER 39 802 1X CONFIGURATION ...
Page 412: ...412 CHAPTER 40 HABP CONFIGURATION ...
Page 422: ...422 CHAPTER 41 MULTICAST OVERVIEW ...
Page 426: ...426 CHAPTER 42 GMRP CONFIGURATION ...
Page 480: ...480 CHAPTER 47 PIM CONFIGURATION ...
Page 506: ...506 CHAPTER 48 MSDP CONFIGURATION ...
Page 552: ...552 CHAPTER 51 TRAFFIC ACCOUNTING CONFIGURATION ...
Page 570: ...570 CHAPTER 53 HA CONFIGURATION ...
Page 582: ...582 CHAPTER 54 ARP CONFIGURATION SwitchA arp protective down recover interval 200 ...
Page 622: ...622 CHAPTER 58 DHCP RELAY AGENT CONFIGURATION ...
Page 684: ...684 CHAPTER 61 QOS CONFIGURATION ...
Page 718: ...718 CHAPTER 63 CLUSTER ...
Page 738: ...738 CHAPTER 67 UDP HELPER CONFIGURATION ...
Page 752: ...752 CHAPTER 69 RMON CONFIGURATION ...
Page 772: ...772 CHAPTER 70 NTP CONFIGURATION ...
Page 796: ...796 CHAPTER 72 FILE SYSTEM MANAGEMENT ...
Page 802: ...802 CHAPTER 73 BIMS CONFIGURATION ...
Page 814: ...814 CHAPTER 74 FTP AND TFTP CONFIGURATION ...
Page 830: ...830 CHAPTER 75 INFORMATION CENTER ...
Page 836: ...836 CHAPTER 76 DNS CONFIGURATION ...
Page 852: ...852 CHAPTER 77 BOOTROM AND HOST SOFTWARE LOADING ...
Page 858: ...858 CHAPTER 78 BASIC SYSTEM CONFIGURATION DEBUGGING ...