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DES-7200 Configuration Guide Chapter 4 DLDP Configuration
4-1
4 DLDP Configuration
4.1 Overview
Based on the SDH platform, the MSTP supports access, processing, and
transmission of multiple services, such as TDM, ATM, and Ethernet, providing a
multi-service node for the unified network management system. Because Ethernet
lacks in the link keep-alive protocol, Ethernet access is always used at user access
points. As a result, link protocol status is still normal even if lines for Ethernet to
access the MSTP network are disconnected. In this case, route convergence slows
down and the difficulty in locating a fault is increased.
The major procedure for device link detection can be divided into the following
stages:
1. Initialization stage
When DLDP is enabled on the interface, DLDP is changed into initialization status,
and then an ARP request is sent to obtain the MAC address of the peer device. If
DLDP cannot obtain the peer MAC address, DLDP is in the initialization stage unless
users prohibit this function and DLDP status is changed into deleted. After the peer
MAC address is obtained, DLDP status is changed into link succeeded.
2. Link succeeded status
In this state, DLDP can send a link detection request to detect line connectivity. After
DLDP responses are received, the interface is marked UP. If responses are not
received, requests are sent until the number of requests exceed the maximum
number. In this case, the link is marked failed and DLDP status is changed into
initialization. If users delete this function during this process, DLDP status is changed
into deleted.
3. Deleted status
In deleted state, the interface status is not analyzed by the link detection function. In
this case, the interface status is consistent with the physical channel status.
The devices on both sides detected by DLDP can be set to work in active/passive
mode. In the passive mode, DLDP detection packets are not sent actively and only
the DLDP detection packets from the peer end are detected and replied to for link
detection. When multi-channel DLDP detection is configured on a convergence router,