How to determine whether a switch is in the process of LDP GR

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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.

Other related questions:
How to determine whether an LSR has GR capabilities
You can run the display ldp session verbose command to check GR capabilities of LDP sessions, and values of the GR Reconnect timer and GR Recovery timer. If the Session FT Flag field is On, the LSR has GR capabilities.

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

How to determine whether CPU usages of the system and processes are high for S series switches
For S series switches (except the S1700), the system CPU usage is within a normal range when the following conditions are met: - The CPU usage does not exceed 80% when the system runs for a long period. - The CPU usage does not exceed 95% in a short period and does not keep increasing. - No high CPU usage alarm is generated. In the following situations, the system may generate an alarm when CPU usage becomes high instantly and then clear this alarm rapidly: Cards just start. Information about all optical modules is queried at a time. Traffic volume increases instantly. This situation is a normal situation and does not affect the device operation. CPU usage of a CPU task process may become low or high, depending on the service volume and processing time. CPU usage is within a normal range as long as the system CPU usage does not exceed 80% and no high CPU usage alarm is generated. For possible causes and common troubleshooting procedures for high CPU usage, see the following: - For the S12700, see "High CPU Usage > Common Information" in S12700 Troubleshooting - Preliminary. - For the S7700 and S9700, see "High CPU Usage > Common Information" in S7700&S9700 Troubleshooting - Preliminary. - For the S1720, S2700, S3700, S5700, and S6700, see "High CPU Usage > Common Information" in S1720&S2700&S3700&S5700&S6700 Troubleshooting - Preliminary. - For the S9300, see "High CPU Usage > Common Information" in S9300 Troubleshooting - Preliminary. - For the S600-E, see "High CPU Usage > Common Information" in S600-E Troubleshooting - Preliminary.

How to check the LDP TCP connections and determine whether TCP connections are normal
The port number for LDP-dedicated TCP connections is 646. Run the display tcp status command. All connections with port number of 646 are LDP TCP connections. In most cases, the server has a Listening port and one or more Established connections. The local port number is 646, and the remote port number is a randomly allocated five-digit numeral. The command output is displayed as follows: display tcp status TCPCB Tid/Soid Local Add:port Foreign Add:port VPNID State 0d3bda5c 32 /1 0.0.0.0:23 0.0.0.0:0 14849 Listening 0b6d91cc 23 /2 2.2.2.2:646 1.1.1.1:53585 0 Established

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.

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