What is the meaning of MTU in the display mpls interface verbose command output

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After you run the display mpls interface verbose command, the following information is displayed:
display mpls interface vlanif 100 verbose
No : 1
Interface : Vlanif100
Status : Up
TE Attribute : Disable
Static LSPCount : 0
Static CR-LSPCount : 0
LDP LSPCount : 0
RSVP LSPCount : 0
MPLS MTU : -
Interface MTU : 1500
Effective MTU : 1500
TE FRR : Disable
Interface Index : 0xd1MTUs in the preceding command output indicate different meanings:
MPLS MTU: MTU configured using the mpls mtu command.
Interface MTU: MTU negotiated on the interface.
Effective MTU: Smaller MTU between MPLS MTU and Interface MTU.
When the MPLS MTU or Interface MTU changes, the configuration takes effect only after you restart the interface.

Other related questions:
Different MTUs are displayed in the display isis interface command output on an S series switch
Q: In the display isis interface command output, why is the MTU on a broadcast network 1497 bytes whereas the MTU on a P2P network 1500 bytes? A: By default, the physical MTU of Ethernet interfaces are 1500 bytes. On a P2P network that has PPP enabled, the MTU is 1500 bytes in the display isis interface command output. On a broadcast network, a 3-byte Local Link Control (LLC) field is added to the data field according to the 802.3 link protocol encapsulation format, and the value of the LLC field is FEFE03. Therefore, in IS-IS, the actual length of the data to be transmitted is 1497 bytes, which is 3 bytes shorter than the physical MTU.

What are the meanings of flags in the display fib command output for S series switches
Q: What are the meanings of flags in the display fib command output? A: The values of flags are as follows: B: indicates a blackhole route, that is, a route with the outbound interface being NULL0. D: indicates a route generated by a dynamic routing protocol such as IS-IS, OSPF, BGP, or RIP. G: indicates a gateway route, that is, a route destined for a gateway. H: indicates a host route. L: indicates a route generated by Address Resolution Protocol (ARP) or End System to Intermediate System (ESIS) routing exchange protocol, which is common in VLAN-ARP scenarios. S: indicates a static route, that is, a route configured using the ip route-static command or configured on the NMS. U: indicates that a route is reachable.

What is the meaning of bps in the command output
bps in the command output is the unit of a packet sending rate, which is also expressed in bit/s.

After I run the display fib command, what does flag mean in the command output
Currently, Flag can have the following values:
  • B: a blackhole route, that is, a route with the outbound interface NULL0.
  • D: a route generated by a dynamic routing protocol such as Intermediate System to Intermediate System routing protocol (IS-IS), open shortest path first (OSPF), Border Gateway Protocol (BGP), or Routing Information Protocol (RIP).
  • G: a gateway route, that is, a route with a gateway as the destination address.
  • H: a host route.
  • S: a static route, that is, a route configured using the ip route-static command or configured on the network management system (NMS).
  • U: a route that is reachable.

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.

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