How can I check whether LDP GR is performed on the AR router

6

Run the display mpls graceful-restart command to check the GR status.
[Huawei] display mpls graceful-restart
Protocol GR state GR start time GR type
LDP Normal - -
CRLDP Normal - -
RSVP Normal - -
BGP Normal - -
L3VPN Normal - -
STATIC Normal - -
CRSTATIC Normal - -
BGP IPV6 Normal - -
STATIC HA Normal - -
L3VPN IPV6 Normal - -
STATIC TP Normal - -
Parameters are described as follows:
Protocol: protocol type
GR state: If the value is Restarting, GR is being performed.
GR start time: The value is displayed as - if GR does not start.
GR type
- System restart
- Protocol restart
The value is displayed as - if GR does not start.

Other related questions:
How to determine whether a switch is in the process of LDP GR
If a device is during the LDP GR, you can run the display mpls graceful-restart command to check the GR information of all MPLS-related protocols, including the GR status, GR begin time, and GR type.

What are the default intervals of the GR timers in the MPLS LDP view
The default interval of the MPLS Forwarding State Holding timer (Neighbor-liveness timer) is 10 minutes. The default intervals of the GR Reconnect timer and GR Recovery timer are both 5 minutes.

Why is LDP loop detection not required on the AR
LDP is generated based on IP routes. A routing protocol such as IS-IS or OSPF can avoid routing loop generation, so LDP loop detection is not required any more.

How do I check the TCP connection established using LDP
LDP uses TCP port 646. Run the display tcp status command. If port 646 is used, TCP connections are established using LDP.

Check whether the AR routers can send logs to the same log host
Yes

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