Precautions During Dldp Configuration; Dldp Configuration - 3Com 5500-SI Configuration Manual

Precautions During DLDP
Configuration

DLDP Configuration

It is recommended that the following precautions be taken during DLDP
configuration:
DLDP works only when the link is up.
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To ensure unidirectional links can be detected, you should make sure: DLDP is
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enabled on both ends, and the time interval for sending advertisement packets,
authentication mode and password are set consistent on both ends.
You can adjust the time interval for sending advertisement packets in different
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network circumstances, so that DLDP can respond rapidly to link failure. The time
interval should be shorter than one-third of the STP convergence time, which is
generally 30 seconds. If too long time interval is set, an STP loop may occur before
DLDP shut down unidirectional links. On the contrary, if too short time interval is
set, network traffic increases, and port bandwidth is reduced.
DLDP does not process any LACP event, and treats each link in the aggregation
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group as independent.
For the configuration of distributed products, note that:
During hot plugging, if the interface board you insert has the same type as that
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you have removed, DLDP restores working automatically.
After the SRPU board switchover, the standby board takes over unidirectional link
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detection. In this case, the DLDP parameters do not change and DLDP checks every
port again for unidirectional links.
For the configuration of the products supporting expandable resilient networking
(XRN), note that:
DLDP supports XRN; its processing is fully distributed. In XRN, port management is
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distributed to each port. Each unit completes only the DLDP tasks for its ports.
DLDP commands executed on a port take effect only on the unit where the port is
located.
The global DLDP configuration must be consistent on all units. The global DLDP
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configuration commands take effect on all the units in the XRN.
Stack ports do not support DLDP.
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Table 77 describes the DLDP basic configuration tasks:
Table 77
DLDP configuration tasks
Operation
Enter system view
Enable DLDP Enable DLDP globally
Enable
DLDP on a
port
Set the authentication mode and
password
Set the time interval for sending DLDP
packets
Command
system-view
dldp enable
Enter interface { interface-type
Ethernet interface-number |
port view interface_name }
Enable dldp enable
DLDP on a
port
dldp authentication-mode
{ none | simple password |
md5 password }
dldp interval integer
DLDP Configuration 93
Description
-
Required, by default,
DLDP is disabled
Optional, by default, the
authentication mode is
none
Optional, by default, the
time interval is 10
seconds.