The tracert command output does not display the IP address of a PE on the public network on an S series switch

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After you perform the following operations on S series switches (except the S1700), the tracert command output does not display the IP address of a PE on the public network:
1. Run the undo ttl propagate command in the system view of the PE to set the TTL propagate mode of MPLS packets to pipe.
2. Run the reset mpls ldp command in the user view to reset MPLS LDPs.

Other related questions:
Reason why the firewall does not display the IP address in the tracert output
By CLI command, from the system view, execute: icmp ttl-exceeded send - By default, an interface is disabled to send ICMP Time Exceeded message; icmp host-unreachable send - this command enables transmitting the ICMP host-unreachable packets; undo firewall defend tracert enable - if (firewall defend tracert enable) command is configured, a FW discards ICMP timeout packets, UDP timeout packets, or destination port unreachable packets.

What is the meaning of the tracert command output on an S series switch
For S series switches (except the S1700), the tracert command displays information about the path on which packets are sent from the source to the destination and checks network connectivity. When a fault occurs on the network, you can run this command to locate the fault. This command is used as follows: [HUAWEI] tracert 192.168.10.10 traceroute to 192.168.10.10(192.168.10.10),max hops: 30 ,packet length: 40,press CTRL_C to break 1 10.16.16.12 23 ms 12 ms 6 ms 2 * * * 3 192.168.10.10 5 ms !<10> 5ms !<10> 6ms !<10> The command output is described as follows: 1 indicates the first-hop gateway. The sequence number increases by each hop. By default, the maximum number of hops is 30. 10.16.16.12 indicates the gateway address of the first hop. The IPv4 address following the serial number of each hop is the gateway address of the hop. 23 ms 12 ms 6 ms indicates the time difference between the three sent UDP packets and the received ICMP Time Exceeded or ICMP Destination Unreachable packets. * * * indicates that no ICMP Time Exceeded packet or ICMP Destination Unreachable packet is received on the second-hop device within a specified period. ! indicates an ICMP Destination Unreachable packet. <10> indicates that the value of the Code field in the ICMP packet is 10, which means that the Destination host is administratively prohibited. There are no reachable routes between the destination host and the source address. This packet is sent by the default gateway of the destination host. For the meanings of other values of the Type and Code fields in an ICMP packet, see Chapter 6 in TCP/IP Illustration Volume I.

What does R represent in the display ip routing-table command output for S series switches
Q: What does R represent in the display ip routing-table command output? A: R represents relay. It indicates that the route is the recursive route. The outbound interface is obtained based on the next hop address of the route. When a static route is configured, if only the next hop address is specified but the outbound interface is not specified, the route is the recursive route. The outbound interface is obtained based on the next hop address of the route. BGP routes are recursive routes.

Method to check IP addresses allocation on S series switches
For S series switches excluding the S1700, run the following commands as required to check IP addresses allocation: - If IP addresses are assigned based on the interface address pool, run the display ip pool [ interface interface-pool-name [ start-ip-address [ end-ip-address ] | all | conflict | expired | used ] ] command. - If IP addresses are assigned based on the global address pool, run the display ip pool [ name ip-pool-name [ start-ip-address [ end-ip-address ] | all | conflict | expired | used ] ] command. Note: - Specify all to check allocation of all the IP addresses. - Specify conflict to check conflicting IP addresses. - Specify expired to check expired IP addresses that are in idle state. - Specify used to check used IP addresses. - Specify start-ip-address [ end-ip-address ] to check allocation of an IP address or some IP addresses.

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