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AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V300R003 CLI-based Configuration Guide - MPLS

This document describes MPLS features on the device and provides configuration procedures and configuration examples.

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Example for Disabling Devices from Distributing LDP Labels to Remote Peers

Example for Disabling Devices from Distributing LDP Labels to Remote Peers

Networking Requirements

As shown in Figure 3-26, PE1, PE2, and PE3 are connected through P, and IS-IS runs among devices. PE1 uses the public network LSP to establish remote LDP sessions with PE2 and PE3 to transmit private network label information. Dynamic PWs are established between PE1 and PE2, between PE1 and PE3.

On an MPLS network, LDP transmits private network label and distributes common LDP labels to remote peers. Multiple remote LDP peers on the network lead to a large number of null labels, which occupies many system resources. The label distribution to remote LDP peers needs to be controlled to save system resources.

Figure 3-26  Networking diagram for disabling devices from distributing LDP labels to remote peers

Configuration Roadmap

To meet the preceding requirements, disable devices from distributing LDP labels to remote peers. The configuration roadmap is as follows:

Disable devices from distributing LDP labels to remote peers on PEs to prohibit them from distributing common LDP labels to each other.

Procedure

  1. Configure IP addresses for interfaces.

    # Configure PE1. The configurations of P, PE2, and PE3 are similar to the configuration of PE1, and are not mentioned here.

    <Huawei> system-view
[Huawei] sysname PE1
[PE1] interface loopback0
[PE1-LoopBack0] ip address 10.10.1.1 32
[PE1-LoopBack0] quit
[PE1] interface gigabitethernet 1/0/1
[PE1-GigabitEthernet1/0/1] ip address 10.1.1.1 24
[PE1-GigabitEthernet1/0/1] quit

  2. Configure IS-IS to advertise the network segments connecting to interfaces on each node and to advertise the routes of hosts with LSR IDs.

    # Configure PE1.

    [PE1] isis 1
[PE1-isis-1] is-level level-2
[PE1-isis-1] network-entity 86.4501.0010.0100.0001.00
[PE1-isis-1] quit
[PE1] interface gigabitethernet 1/0/1
[PE1-GigabitEthernet1/0/1] isis enable 1
[PE1-GigabitEthernet1/0/1] quit
[PE1] interface loopback 0
[PE1-LoopBack0] isis enable 1
[PE1-LoopBack0] quit

    # Configure P.

    [P] isis 1
[P-isis-1] is-level level-2
[P-isis-1] network-entity 86.4501.0030.0300.0003.00
[P-isis-1] quit
[P] interface gigabitethernet 1/0/1
[P-GigabitEthernet1/0/1] isis enable 1
[P-GigabitEthernet1/0/1] quit
[P] interface gigabitethernet 1/0/3
[P-GigabitEthernet1/0/3] isis enable 1
[P-GigabitEthernet1/0/3] quit
[P] interface gigabitethernet 1/0/2
[P-GigabitEthernet1/0/2] isis enable 1
[P-GigabitEthernet1/0/2] quit
[P] interface loopback 0
[P-LoopBack0] isis enable 1
[P-LoopBack0] quit

    # Configure PE2.

    [PE2] isis 1
[PE2-isis-1] is-level level-2
[PE2-isis-1] network-entity 86.4501.0050.0500.0005.00
[PE2-isis-1] quit
[PE2] interface gigabitethernet 1/0/1
[PE2-GigabitEthernet1/0/1] isis enable 1
[PE2-GigabitEthernet1/0/1] quit
[PE2] interface loopback 0
[PE2-LoopBack0] isis enable 1
[PE2-LoopBack0] quit

    # Configure PE3.

    [PE3] isis 1
[PE3-isis-1] is-level level-2
[PE3-isis-1] network-entity 86.4501.0040.0400.0004.00
[PE3-isis-1] quit
[PE3] interface gigabitethernet 1/0/1
[PE3-GigabitEthernet1/0/1] isis enable 1
[PE3-GigabitEthernet1/0/1] quit
[PE3] interface loopback 0
[PE3-LoopBack0] isis enable 1
[PE3-LoopBack0] quit

  3. Enable MPLS and MPLS LDP on each node and each interface.

    # Configure PE1.

    [PE1] mpls lsr-id 10.10.1.1
[PE1] mpls
[PE1-mpls] quit
[PE1] mpls ldp
[PE1-mpls-ldp] quit
[PE1] interface gigabitethernet 1/0/1
[PE1-GigabitEthernet1/0/1] mpls
[PE1-GigabitEthernet1/0/1] mpls ldp
[PE1-GigabitEthernet1/0/1] quit

    # Configure P.

    [P] mpls lsr-id 10.10.1.2
[P] mpls
[P-mpls] quit
[P] mpls ldp
[P-mpls-ldp] quit
[P] interface gigabitethernet 1/0/1
[P-GigabitEthernet1/0/1] mpls
[P-GigabitEthernet1/0/1] mpls ldp
[P-GigabitEthernet1/0/1] quit
[P] interface gigabitethernet 1/0/2
[P-GigabitEthernet1/0/2] mpls
[P-GigabitEthernet1/0/2] mpls ldp
[P-GigabitEthernet1/0/2] quit
[P] interface gigabitethernet 1/0/3
[P-GigabitEthernet1/0/3] mpls
[P-GigabitEthernet1/0/3] mpls ldp
[P-GigabitEthernet1/0/3] quit

    # Configure PE2.

    [PE2] mpls lsr-id 10.10.1.5
[PE2] mpls
[PE2-mpls] quit
[PE2] mpls ldp
[PE2-mpls-ldp] quit
[PE2] interface gigabitethernet 1/0/1
[PE2-GigabitEthernet1/0/1] mpls
[PE2-GigabitEthernet1/0/1] mpls ldp
[PE2-GigabitEthernet1/0/1] quit

    # Configure PE3.

    [PE3] mpls lsr-id 10.10.1.4
[PE3] mpls
[PE3-mpls] quit
[PE3] mpls ldp
[PE3-mpls-ldp] quit
[PE3] interface gigabitethernet 1/0/1
[PE3-GigabitEthernet1/0/1] mpls
[PE3-GigabitEthernet1/0/1] mpls ldp
[PE3-GigabitEthernet1/0/1] quit

    When the configurations are complete, LDP sessions and public network LSPs are established between neighboring nodes. Run the display mpls ldp session command on each node. The command output shows that LDP session status is Operational. PE1 is used as an example

    [PE1] display mpls ldp session

 LDP Session(s) in Public Network
 Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
 A '*' before a session means the session is being deleted.
 ------------------------------------------------------------------------------
 PeerID             Status      LAM  SsnRole  SsnAge      KASent/Rcv
 ------------------------------------------------------------------------------
 10.10.1.2:0        Operational DU   Passive  0000:00:01  6/6
 ------------------------------------------------------------------------------
 TOTAL: 1 session(s) Found.

    Run the display mpls ldp lsp command to check the LSP setup result and label distribution.

    [PE1] display mpls ldp lsp

 LDP LSP Information
 -------------------------------------------------------------------------------
 DestAddress/Mask   In/OutLabel    UpstreamPeer    NextHop         OutInterface
 -------------------------------------------------------------------------------
 10.10.1.1/32       3/NULL         10.10.1.2       127.0.0.1       InLoop0
*10.10.1.1/32       Liberal/1025                   DS/10.10.1.2
 10.10.1.2/32       NULL/3         -               10.1.1.2        GE1/0/1
 10.10.1.2/32       1024/3         10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.4/32       NULL/1024      -               10.1.1.2        GE1/0/1
 10.10.1.4/32       1025/1024      10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.5/32       NULL/1026      -               10.1.1.2        GE1/0/1
 10.10.1.5/32       1022/1026      10.10.1.2       10.1.1.2        GE1/0/1
 -------------------------------------------------------------------------------
 TOTAL: 7 Normal LSP(s) Found.
 TOTAL: 1 Liberal LSP(s) Found.
 TOTAL: 0 Frr LSP(s) Found.
 A '*' before an LSP means the LSP is not established
 A '*' before a Label means the USCB or DSCB is stale
 A '*' before a UpstreamPeer means the session is stale
 A '*' before a DS means the session is stale
 A '*' before a NextHop means the LSP is FRR LSP

  4. Set up the remote MPLS LDP peer relationship between PEs at both ends of the PW.

    # Configure PE1.

    [PE1] mpls ldp remote-peer PE2
[PE1-mpls-ldp-remote-pe2] remote-ip 10.10.1.5
[PE1-mpls-ldp-remote-pe2] quit
[PE1] mpls ldp remote-peer PE3
[PE1-mpls-ldp-remote-pe3] remote-ip 10.10.1.4
[PE1-mpls-ldp-remote-pe3] quit

    # Configure PE2.

    [PE2] mpls ldp remote-peer PE1
[PE2-mpls-ldp-remote-pe1] remote-ip 10.10.1.1
[PE2-mpls-ldp-remote-pe1] quit

    # Configure PE3.

    [PE3] mpls ldp remote-peer PE1
[PE3-mpls-ldp-remote-pe1] remote-ip 10.10.1.1
[PE3-mpls-ldp-remote-pe1] quit

    When the configurations are complete, remote LDP sessions are established between neighboring nodes. Run the display mpls ldp session command on each node. The command output shows that LDP session status is Operational. PE1 is used as an example

    [PE1]display mpls ldp session

 LDP Session(s) in Public Network
 Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
 A '*' before a session means the session is being deleted.
 ------------------------------------------------------------------------------
 PeerID             Status      LAM  SsnRole  SsnAge      KASent/Rcv
 ------------------------------------------------------------------------------
 10.10.1.2:0        Operational DU   Passive  0000:00:18  75/75
 10.10.1.4:0        Operational DU   Passive  0000:00:10  43/43
 10.10.1.5:0        Operational DU   Passive  0000:00:12  50/50
 ------------------------------------------------------------------------------
 TOTAL: 3 session(s) Found.

    Run the display mpls ldp lsp command to view the label distribution. The command output shows that PEs have distributed liberal labels to their own neighbors. These labels, however, are idle and occupy many system resources in MPLS L2VPN applications that use PWE3 technology.

    [PE1] display mpls ldp lsp

 LDP LSP Information
 -------------------------------------------------------------------------------
 DestAddress/Mask   In/OutLabel    UpstreamPeer    NextHop         OutInterface
 -------------------------------------------------------------------------------
 10.10.1.1/32       3/NULL         10.10.1.2       127.0.0.1       InLoop0
 10.10.1.1/32       3/NULL         10.10.1.5       127.0.0.1       InLoop0
 10.10.1.1/32       3/NULL         10.10.1.4       127.0.0.1       InLoop0
*10.10.1.1/32       Liberal/1025                   DS/10.10.1.2
*10.10.1.1/32       Liberal/1024                   DS/10.10.1.5
*10.10.1.1/32       Liberal/1025                   DS/10.10.1.4
 10.10.1.2/32       NULL/3         -               10.1.1.2        GE1/0/1
 10.10.1.2/32       1024/3         10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.2/32       1024/3         10.10.1.5       10.1.1.2        GE1/0/1
 10.10.1.2/32       1024/3         10.10.1.4       10.1.1.2        GE1/0/1
 10.10.1.4/32       NULL/1024      -               10.1.1.2        GE1/0/1
 10.10.1.4/32       1025/1024      10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.4/32       1025/1024      10.10.1.5       10.1.1.2        GE1/0/1
 10.10.1.4/32       1025/1024      10.10.1.4       10.1.1.2        GE1/0/1
*10.10.1.4/32       Liberal/1026                   DS/10.10.1.5
*10.10.1.4/32       Liberal/3                      DS/10.10.1.4
 10.10.1.5/32       NULL/1026      -               10.1.1.2        GE1/0/1
 10.10.1.5/32       1022/1026      10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.5/32       1022/1026      10.10.1.5       10.1.1.2        GE1/0/1
 10.10.1.5/32       1022/1026      10.10.1.4       10.1.1.2        GE1/0/1
*10.10.1.5/32       Liberal/3                      DS/10.10.1.5
*10.10.1.5/32       Liberal/1026                   DS/10.10.1.4
 -------------------------------------------------------------------------------
 TOTAL: 15 Normal LSP(s) Found.
 TOTAL: 9 Liberal LSP(s) Found.
 TOTAL: 0 Frr LSP(s) Found.
 A '*' before an LSP means the LSP is not established
 A '*' before a Label means the USCB or DSCB is stale
 A '*' before a UpstreamPeer means the session is stale
 A '*' before a DS means the session is stale
 A '*' before a NextHop means the LSP is FRR LSP

  5. Disable devices from distributing LDP labels to remote peers on PEs at both ends of a PW.

    # Configure PE1.

    [PE1] mpls ldp remote-peer PE2
[PE1-mpls-ldp-remote-pe2] remote-ip 10.10.1.5 pwe3
[PE1-mpls-ldp-remote-pe2] quit
[PE1] mpls ldp remote-peer PE3
[PE1-mpls-ldp-remote-pe3] remote-ip 10.10.1.4 pwe3
[PE1-mpls-ldp-remote-pe3] quit

    # Configure PE2.

    [PE2] mpls ldp remote-peer PE1
[PE2-mpls-ldp-remote-pe1] remote-ip 10.10.1.1 pwe3
[PE2-mpls-ldp-remote-pe1] quit

    # Configure PE3.

    [PE3] mpls ldp remote-peer PE1
[PE3-mpls-ldp-remote-pe1] remote-ip 10.10.1.1 pwe3
[PE3-mpls-ldp-remote-pe1] quit

    When the configurations are complete, PEs do not distribute labels to remote LDP peers. Run the display mpls ldp lsp command on each node to view the established LSP after devices from distributing LDP labels to remote peers is disabled. PE1 is used as an example.

    [PE1] display mpls ldp lsp

 LDP LSP Information
 -------------------------------------------------------------------------------
 DestAddress/Mask   In/OutLabel    UpstreamPeer    NextHop         OutInterface
 -------------------------------------------------------------------------------
 10.10.1.1/32       3/NULL         10.10.1.2       127.0.0.1       InLoop0
*10.10.1.1/32       Liberal/1025                   DS/10.10.1.2
 10.10.1.2/32       NULL/3         -               10.1.1.2        GE1/0/1
 10.10.1.2/32       1024/3         10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.4/32       NULL/1024      -               10.1.1.2        GE1/0/1
 10.10.1.4/32       1025/1024      10.10.1.2       10.1.1.2        GE1/0/1
 10.10.1.5/32       NULL/1026      -               10.1.1.2        GE1/0/1
 10.10.1.5/32       1022/1026      10.10.1.2       10.1.1.2        GE1/0/1
 -------------------------------------------------------------------------------
 TOTAL: 7 Normal LSP(s) Found.
 TOTAL: 1 Liberal LSP(s) Found.
 TOTAL: 0 Frr LSP(s) Found.
 A '*' before an LSP means the LSP is not established
 A '*' before a Label means the USCB or DSCB is stale
 A '*' before a UpstreamPeer means the session is stale
 A '*' before a DS means the session is stale
 A '*' before a NextHop means the LSP is FRR LSP

    A large number of idle remote labels and LSPs are disabled. The LSPs are established based on the local LDP sessions.

Configuration Files

  • PE1 configuration file

    #
sysname PE1
#
mpls lsr-id 10.10.1.1
mpls
#
mpls ldp
#
mpls ldp remote-peer pe2
 remote-ip 10.10.1.5 pwe3
#
mpls ldp remote-peer pe3
 remote-ip 10.10.1.4 pwe3
#
isis 1
 is-level level-2
 network-entity 86.4501.0010.0100.0001.00
#
interface GigabitEthernet1/0/1
 ip address 10.1.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.1 255.255.255.255
 isis enable 1
#
return

  • P configuration file

    #
sysname P
#
mpls lsr-id 10.10.1.2
mpls
#
mpls ldp
#
isis 1
 is-level level-2
 network-entity 86.4501.0030.0300.0003.00
#
interface GigabitEthernet1/0/1
 ip address 10.1.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface GigabitEthernet1/0/3
 ip address 10.2.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface GigabitEthernet1/0/2
 ip address 10.3.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.2 255.255.255.255
 isis enable 1
#
return

  • PE2 configuration file

    #
sysname PE2
#
mpls lsr-id 10.10.1.5
mpls
#
mpls ldp
#
mpls ldp remote-peer pe1
 remote-ip 10.10.1.1 pwe3
#
isis 1
 is-level level-2
 network-entity 86.4501.0050.0500.0005.00
#
interface GigabitEthernet1/0/1
 ip address 10.2.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.5 255.255.255.255
 isis enable 1
#
return

  • PE3 configuration file

    #
sysname PE3
#
mpls lsr-id 10.10.1.4
mpls
#
mpls ldp
#
mpls ldp remote-peer pe1
 remote-ip 10.10.1.1 pwe3
#
isis 1
 is-level level-2
 network-entity 86.4501.0040.0400.0004.00
#
interface GigabitEthernet1/0/1
 ip address 10.3.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack0
 ip address 10.10.1.4 255.255.255.255
 isis enable 1
#
return
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Updated: 2022-12-12

Document ID: EDOC1100069335

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