LDP User Guide

1. Overview

Label distribution protocol (LDP) is the most commonly used protocol in the MPLS network. It generates and distributes labels and thus helps in MPLS packet switching and forwarding. By using LDP, label switching routers in an MPLS network are able to exchange label mapping information to create label-switched paths (LSPs) for switching data packets.

1.1. Peer Discovery

LDP sends UDP multicast hello packets to discover its nieghbors and establishes neighbor adjacency with other directly connected label switch routers (LSRs). The hello message are periodically sent on LDP-enabled interfaces.

1.2. Session Establishment

After peer discovery, “initialization messages” are sent each other. In these messages, the session Parameters are sent. The LDP sessions are maintained by periodic keeipalive message.

After the LDP neighbors are discovered, TCP session is established and the LDP FSM is triggered and LDP session becomes operational. LSRs start exchanging label mapping information with each other.

1.3. Label Generation

LDP generates label bindings for the IP addresses of the LDP-enabled loopback interfaces, and then advertises them to all neighbors.

1.4. Label Management Modes

1.4.1. Label Advertisement Mode

LDP supports the Downstream Unsolicited feature in RBFS, where label bindings are advertised to all upstream neighbors. By defualt, label advertisement operates in the Downstream Unsolicited mode.

1.4.2. Label Distribution Control Mode

LDP supports the Ordered Label Distribution Control where an LSR will initiate the transmission of the label mapping only for the prefix for which it has a label mapping from the next-hop of the prefix or for which it is an egress.

1.4.3. Label Retention Mode

LDP supports the Liberal Label Retention Mode where all the label mapping advertisements for all routes received from all the LDP neighbors are retained.

1.5. Supported LDP Standards

RFC Number	Description
RFC 5036	LDP Specification The following modes are supported by RBFS for the features listed in RFC 5036: Label advertisement: Downstream Unsolicited mode is supported but not Downstream on Demand mode. Label distribution control: Ordered mode is supported, but not Independent mode. Label retention: Liberal mode is supported, but not Conservative mode.
RFC 5283	LDP Extension for Inter-Area Label Switched Paths (LSPs)
RFC 5443	LDP IGP Synchronization

RFC Number

Description

RFC 5036

LDP Specification

The following modes are supported by RBFS for the features listed in RFC 5036:

Label advertisement: Downstream Unsolicited mode is supported but not Downstream on Demand mode.
Label distribution control: Ordered mode is supported, but not Independent mode.
Label retention: Liberal mode is supported, but not Conservative mode.

RFC 5283

LDP Extension for Inter-Area Label Switched Paths (LSPs)

RFC 5443

LDP IGP Synchronization

1.6. Supported LDP Features

The following LDP features are supported in this release of RBFS:

Support for the following label management modes.
- Downstream unsolicited mode in label advertisement
- Ordered mode in label distribution control
- Liberal mode in label retention
Loop Detection
Inter-Area Support
Tracking IGP Metric
IGP LDP Synchronization

1.7. Supported Platforms

Not all features are necessarily supported on each hardware platform. Refer to the Platform Guide for the features and the sub-features that are or are not supported by each platform.

2. Configuration Hierarchy

The diagram below illustrates the LDP configuration hierarchy.

LDP Configuration Hierarchy

2.1. Configuration Syntax and Commands

The following sections describe the LDP configuration syntax and commands.

2.1.1. LDP Instance Configuration

At this configuration hierarchy you configure LDP protocol parameters which are generic to the LDP instance.

Syntax:

set instance <instance-name> protocol ldp <attribute> <value>

Attribute	Description
<instance-name>	Name of the instance.
interface <name>	Name of the logical interface.
router-id <router-id>	Router identifier in IPv4 format.
source-address <source-address>	Use the specified IP address as the transport address for the LDP session.
igp-synchronization <…>	LDP IGP synchronization configuration. This option is supported only on interfaces running Intermediate System-to-System (IS-IS) processes. Refer to section 2.1.4, “LDP IGP Synchronization” for LDP-IGP synchronization configuration details.
loop-detection <…>	The LDP loop detection feature enables LDP to detect loops during an LSP establishment. Refer to section 2.1.2, “LDP Loop Detection Configuration” for the loop detection configuration details.
timer <…>	Specifies the Hello hold time, Hello interval, Keepalive hold time, and Keepalive interval. Refer to section 2.1.3, “LDP Timer Configuration” for the LDP timer configuration details.

Attribute

Description

<instance-name>

Name of the instance.

interface <name>

Name of the logical interface.

router-id <router-id>

Router identifier in IPv4 format.

source-address <source-address>

Use the specified IP address as the transport address for the LDP session.

igp-synchronization <…>

LDP IGP synchronization configuration. This option is supported only on interfaces running Intermediate System-to-System (IS-IS) processes. Refer to section 2.1.4, “LDP IGP Synchronization” for LDP-IGP synchronization configuration details.

loop-detection <…>

The LDP loop detection feature enables LDP to detect loops during an LSP establishment. Refer to section 2.1.2, “LDP Loop Detection Configuration” for the loop detection configuration details.

timer <…>

Specifies the Hello hold time, Hello interval, Keepalive hold time, and Keepalive interval. Refer to section 2.1.3, “LDP Timer Configuration” for the LDP timer configuration details.

Example: LDP Instance Configuration

The following example shows some LDP instance configuration attributes. The further LDP configurations like timers and loop-detection are shown in the examples in the subsequent sections.

supervisor@rtbrick>SPINE01: cfg> show config instance default protocol ldp
{
    "rtbrick-config:ldp": {
      "router-id": "192.168.0.1",
      "interface": [
        {
          "name": "ifl-0/0/0/1"
        },
        {
          "name": "ifl-0/0/0/100"
        },
        {
          "name": "ifl-0/0/0/101"
        },
        {
          "name": "ifl-0/0/1/102"
        },
        {
          "name": "ifl-0/0/2/1"
        },
        {
          "name": "ifl-0/0/3/1"
        },
        {
          "name": "lo-0/0/0/1"
        },
        {
          "name": "lo-0/0/0/2"
        },
        {
          "name": "lo-0/0/0/3"
        },
        {
          "name": "lo-0/0/0/4"
        },
        {
          "name": "lo-0/0/0/5"
        }
      ]
    }
  }
supervisor@rtbrick>SPINE01: cfg>

2.1.2. LDP Loop Detection Configuration

The LDP loop detection feature enables LDP to detect loops during an LSP establishment.

Syntax:

set instance <instance-name> protocol ldp loop-detection <attribute> <value>

Attribute	Description
hop-count <hop-count>	Specifies the hop count limit for loop detection. Range: 0-255. Default: 32.
status <enable\|disable>	Enables or disables loop detection. By default, this option is disabled. When this option is enabled, both hop-count and path vector are enabled.
vector-length <vector-length>	Specifies the path vector length limit for loop detection. Range: 0-255. Default: 32.

Attribute

Description

hop-count <hop-count>

Specifies the hop count limit for loop detection. Range: 0-255. Default: 32.

status <enable|disable>

Enables or disables loop detection. By default, this option is disabled. When this option is enabled, both hop-count and path vector are enabled.

vector-length <vector-length>

Specifies the path vector length limit for loop detection. Range: 0-255. Default: 32.

Example 1: LDP Loop Detection Configuration

supervisor@rtbrick>SPINE01: cfg> show config instance default protocol ldp loop-detection
{
    "rtbrick-config:loop-detection": {
      "enable": "true",
      "hop-count": 64,
      "vector-length": 64
    }
  }
supervisor@rtbrick>SPINE01: cfg>

2.1.3. LDP Timer Configuration

Specify the hello timer and hold-down timer for LDP adjacency. Similarly, specify the keepalive and keepalive timeout settings for the LDP session.

Syntax:

set instance <instance-name> protocol ldp timer <attribute> <value>

Attribute	Description
hello hold-time <hold-time>	Specifies the hello hold-time interval in seconds before declaring a neighbor to be down. Range: 0-65535. Default: 15.
hello interval <interval>	Specifies the hello messages interval in seconds. Range: 0-65535. Default: 5.
session keepalive-interval <keepalive-interval>	Specifies the session keepalive messages interval in seconds. Range: 1-65535. Default: 10.
session keepalive-timeout <keepalive-timeout>	Specifies the session keepalive timeout in seconds before declaring a session to be down. Range: 1-65535. Default: 30.

Attribute

Description

hello hold-time <hold-time>

Specifies the hello hold-time interval in seconds before declaring a neighbor to be down. Range: 0-65535. Default: 15.

hello interval <interval>

Specifies the hello messages interval in seconds. Range: 0-65535. Default: 5.

session keepalive-interval <keepalive-interval>

Specifies the session keepalive messages interval in seconds. Range: 1-65535. Default: 10.

session keepalive-timeout <keepalive-timeout>

Specifies the session keepalive timeout in seconds before declaring a session to be down. Range: 1-65535. Default: 30.

Example 1: LDP Timer Configuration

supervisor@rtbrick>SPINE01: cfg> show config instance default protocol ldp timer
{
    "rtbrick-config:timer": {
      "hello": {
        "interval": 10,
        "hold-time": 20
      },
      "session": {
        "keepalive-interval": 3000,
        "keepalive-timeout": 5000
      }
    }
  }
supervisor@rtbrick>SPINE01: cfg>

2.1.4. LDP IGP Synchronization

Synchronization between LDP and the underlying interior gateway protocol (IGP) ensures that the LDP path is fully established before the IGP path is used for forwarding traffic. LDP IGP synchronization is supported only on interfaces running Intermediate System-to-System (IS-IS) processes.

Syntax:

set instance <instance-name> protocol ldp igp-synchronization <attribute> <value>

Attribute	Description
hold-timer <hold-timer>	Specifies the hold-timer in seconds to limit how long the IGP session must wait before declaring the LDP synchronization. Range: 0-60. Default: 10.

Attribute

Description

hold-timer <hold-timer>

Specifies the hold-timer in seconds to limit how long the IGP session must wait before declaring the LDP synchronization. Range: 0-60. Default: 10.

Example 1: LDP IGP Synchronization Configuration

supervisor@rtbrick>SPINE01: cfg> show config instance default protocol ldp igp-synchronization
{
    "rtbrick-config:igp-synchronization": {
     hold-timer": 60,
    }
  }
supervisor@rtbrick>SPINE01: cfg>

3. LDP Operational Commands

3.1. LDP Show Commands

The LDP show commands provide detailed information about the LDP protocol operations.

3.1.1. LDP Summary

Syntax:

show ldp summary <options>

Option	Description
-	Without any option, the commands displays the LDP summary information for all instances.
instance <instance-name>	Displays LDP summary information about the specified instance.

Option

Description

Without any option, the commands displays the LDP summary information for all instances.

instance <instance-name>

Displays LDP summary information about the specified instance.

Example: LDP summary for the default instance

supervisor@rtbrick>SPINE01: op> show ldp summary
Instance: default
  General information:
    LDP identifier: 192.168.0.1:0, Version: 1
    FEC resolution: Best match
    Protocol preference: 9
    LSR ID: 192.168.0.1
  Modes:
    Advertisement mode: Downstream Unsolicited
    Advertisement control mode: Ordered
    Label retention mode: Liberal
  Capabilities:
    IPv6 address family: -  , Graceful restart: False
    Loop detection: False
      Hop count: -, Vector length: -
  Timers:
    Adjacency:
      Hello: 5s, Holdtime: 15s
    Targeted adjacency:
      Hello: 15s, Holdtime: 45s
    Session:
      Keepalive: 10s, Holdtime: 30s
  Statistics:
    Adjacency:
      Link adjacency: 5, Targeted adjacency: 0
    Session:
      Session in non-existent: 0, Session in initialized: 0
      Session in opensent: 0, Session in openconfirm: 0
      Session in operational: 2
supervisor@rtbrick>SPINE01: op>

3.1.2. LDP Neighbor

Syntax:

show ldp neighbor <options>

Option	Description
-	Without any option, this command displays information about LDP neighbors.
detail	Detailed information about the LDP neighbors.
instance <instance-name>	Displays LDP neighbor information about the specified instance.
instance <instance-name> detail	Displays detailed LDP neighbor information about the specified instance.
instance <instance-name> ldp-id <ldp-id>	Displays LDP neighbor information about the specified LDP identifier and instance.
interface <name>	Displays LDP neighbor information about the specified interface.
interface <name> detail	Displays detailed LDP neighbor information about the specified interface.
ldp-id <ldp-id>	Displays LDP neighbor information about the specified LDP identifier.

Option

Description

Without any option, this command displays information about LDP neighbors.

detail

Detailed information about the LDP neighbors.

instance <instance-name>

Displays LDP neighbor information about the specified instance.

instance <instance-name> detail

Displays detailed LDP neighbor information about the specified instance.

instance <instance-name> ldp-id <ldp-id>

Displays LDP neighbor information about the specified LDP identifier and instance.

interface <name>

Displays LDP neighbor information about the specified interface.

interface <name> detail

Displays detailed LDP neighbor information about the specified interface.

ldp-id <ldp-id>

Displays LDP neighbor information about the specified LDP identifier.

Example 1: Summary view of LDP Neighbor

supervisor@rtbrick>SPINE01: op> show ldp neighbor
Instance: default
  Interface           LDP ID              Transport IP  Up Since                  Expires
  ifl-0/0/0/1      192.168.0.2:0       192.168.0.2   Thu Feb 09 12:17:15       in 11s
  ifl-0/0/2/1      192.168.0.3:0       192.168.0.3   Thu Feb 09 12:17:31       in 12s
  ifl-0/0/0/100    192.168.0.2:0       192.168.0.2   Thu Feb 09 12:17:15       in 11s
  ifl-0/0/0/101    192.168.0.2:0       192.168.0.2   Thu Feb 09 12:17:15       in 11s
  ifl-0/0/1/102    192.168.0.2:0       192.168.0.2   Thu Feb 09 12:17:15       in 11s
supervisor@rtbrick>SPINE01: op>

Example 2: Detailed View of LDP Neighbor

supervisor@rtbrick>SPINE01: op> show ldp neighbor detail
Instance: default
  LDP-Identifier: 192.168.0.2:0, Interface: ifl-0/0/0/1
  Negotiated holdtime: 15, Expiry time: 14s 522483us
  Local link address: 12.0.0.1, Peer link address: 12.0.0.2
  Local transport address: 192.168.0.1, Peer transport address: 192.168.0.2
  Local holdtime: 15, Peer holdtime: 15, Up since: Thu Feb 09 12:17:15
  Last transition time: Thu Feb 09 12:41:55 GMT +0000 2023

<...>

3.1.3. LDP Session

Syntax:

show ldp session <options>

Option	Description
-	Without any option, this command displays a summary of LDP session information.
detail	Displays detailed information about the LDP sessions.
instance <instance-name>	Displays LDP session information about the specified instance.
instance <instance-name> detail	Displays detailed LDP session information about the specified instance.
instance <instance-name> ldp-id <ldp-id>	Displays LDP session information about the specified LDP identifier and instance.
ldp-id <ldp-id>	Displays LDP session information about the specified LDP identifier.

Option

Description

Without any option, this command displays a summary of LDP session information.

detail

Displays detailed information about the LDP sessions.

instance <instance-name>

Displays LDP session information about the specified instance.

instance <instance-name> detail

Displays detailed LDP session information about the specified instance.

instance <instance-name> ldp-id <ldp-id>

Displays LDP session information about the specified LDP identifier and instance.

ldp-id <ldp-id>

Displays LDP session information about the specified LDP identifier.

Example 1: Summary view of LDP Session

supervisor@rtbrick>SPINE01: op> show ldp session
Instance: default
  LDP ID            Peer IP           State             Up/Down           FECRcvd   FECSent
  192.168.0.2:0     192.168.0.2       Operational       0d:00h:29m:44s         15        15
  192.168.0.3:0     192.168.0.3       Operational       0d:00h:29m:29s         15        15
supervisor@rtbrick>SPINE01: op>

Example 2: Detailed View of LDP Session

supervisor@rtbrick>SPINE01: op> show ldp session detail
Instance: default
  LDP Identifier: 192.168.0.2:0, Peer IP: 192.168.0.2, Local IP: 192.168.0.1
    Type: link, State: Operational, Uptime: 0d:00h:34m:35s
    Reason:
    Last transition: Thu Feb 09 12:17:28 GMT +0000 2023, Flap count: 0
  Advertisement Mode:
    Peer: Downstream unsolicited, Local: Downstream unsolicited
    Negotiated: Downstream unsolicited
  Timers:
    Connect retry: 10s
    Peer keepalive interval: 10s, Local keepalive interval: 10s
    Peer keepalive timeout: 30s, Local keepalive timeout: 30s
    Negotiated keepalive interval: 10s
    Negotiated keepalive timeout: 30s
  Received messages:
    Initialization: 1, KeepAlive: 208, Notification: 0
    Address: 1, Address Withdraw: 0, Label Mapping: 15
    Label Withdraw: 0, Label Release: 0
  Sent messages:
    Initialization: 1, KeepAlive: 208, Notification: 0
    Address: 1, Address Withdraw: 0, Label Mapping: 15
    Label Withdraw: 0, Label Release: 0
<...>

3.1.4. LDP Address

Syntax:

show ldp address <options>

Option	Description
-	Without any option, this command displays a summary of all the interface addresses received from the LDP sessions.
instance <instance-name>	Displays LDP address information about the specified instance.
instance <instance-name> <afi>	Displays LDP address of the specified address family (AFI). Supported AFI value is 'ipv4'.
instance <instance-name> ldp-id <ldp-id>	Displays LDP address information about the specified LDP identifier and instance.
ldp-id <ldp-id>	Displays LDP address information about the specified LDP identifier.

Option

Description

Without any option, this command displays a summary of all the interface addresses received from the LDP sessions.

instance <instance-name>

Displays LDP address information about the specified instance.

instance <instance-name> <afi>

Displays LDP address of the specified address family (AFI). Supported AFI value is 'ipv4'.

instance <instance-name> ldp-id <ldp-id>

Displays LDP address information about the specified LDP identifier and instance.

ldp-id <ldp-id>

Displays LDP address information about the specified LDP identifier.

Example: Summary View of LDP Address

supervisor@rtbrick>SPINE01: op> show ldp address
Instance: default, LDP Identifier: 192.168.0.2:0, AFI: ipv4
  12.0.0.2
  23.0.0.2
  24.0.0.2
  26.0.0.2
  192.168.0.2
  12.0.1.2
  23.0.1.2
  192.168.1.2
  12.0.2.2
  23.0.2.2
  192.168.2.2
  12.0.3.2
  23.0.3.2
  192.168.3.2
  192.168.4.2
<...>

3.1.5. LDP Binding

Syntax:

show ldp binding <options>

Option	Description
-	Without any option, this command displays a summary of all the LDP label bindings.
instance <instance-name>	Displays LDP label binding information about the specified instance.
instance <instance-name> prefix <ip>	Displays LDP label binding information about the specified prefix and instance. Supported prefix value is 'ipv4'.
prefix <ip>	Displays the LDP label binding information for the specified prefix. Supported prefix value is 'ipv4'.
received	Displays the LDP received label binding information of the LDP sessions.
received instance <instance-name>	Displays LDP received label binding information of the specified instance.
received instance <instance-name> ldp-id <ldp-id>	Displays LDP received label binding information about the specified LDP identifier and instance.
received ldp-id <ldp-id>	Displays LDP received label binding information of the specified LDP identifier.
sent	Displays the LDP sent label binding information of the LDP sessions.
sent instance <instance-name>	Displays LDP sent label binding information of the specified instance.
sent instance <instance-name> ldp-id <ldp-id>	Displays LDP sent label binding information about the specified LDP identifier and instance.
sent ldp-id <ldp-id>	Displays LDP sent label binding information of the specified LDP identifier.

Option

Description

Without any option, this command displays a summary of all the LDP label bindings.

instance <instance-name>

Displays LDP label binding information about the specified instance.

instance <instance-name> prefix <ip>

Displays LDP label binding information about the specified prefix and instance. Supported prefix value is 'ipv4'.

prefix <ip>

Displays the LDP label binding information for the specified prefix. Supported prefix value is 'ipv4'.

received

Displays the LDP received label binding information of the LDP sessions.

received instance <instance-name>

Displays LDP received label binding information of the specified instance.

received instance <instance-name> ldp-id <ldp-id>

Displays LDP received label binding information about the specified LDP identifier and instance.

received ldp-id <ldp-id>

Displays LDP received label binding information of the specified LDP identifier.

sent

Displays the LDP sent label binding information of the LDP sessions.

sent instance <instance-name>

Displays LDP sent label binding information of the specified instance.

sent instance <instance-name> ldp-id <ldp-id>

Displays LDP sent label binding information about the specified LDP identifier and instance.

sent ldp-id <ldp-id>

Displays LDP sent label binding information of the specified LDP identifier.

Example 1: Summary view of LDP Binding

supervisor@rtbrick>SPINE01: op> show ldp binding

Instance: default, AFI: ipv4
  Prefix                In Label           Out Label          LDP ID             Status
  192.168.0.1/32        -                  label:3            -                  Best
                        label:20066        -                  192.168.0.3:0      Non-best
                        label:20065        -                  192.168.0.2:0      Non-best
  192.168.1.1/32        -                  label:3            -                  Best
                        label:20066        -                  192.168.0.3:0      Non-best
                        label:20065        -                  192.168.0.2:0      Non-best
  192.168.2.1/32        -                  label:3            -                  Best
                        label:20066        -                  192.168.0.3:0      Non-best
                        label:20065        -                  192.168.0.2:0      Non-best
  192.168.3.1/32        -                  label:3            -                  Best
                        label:20066        -                  192.168.0.3:0      Non-best
                        label:20065        -                  192.168.0.2:0      Non-best
  192.168.4.1/32        -                  label:3            -                  Best
                        label:20066        -                  192.168.0.3:0      Non-best
                        label:20065        -                  192.168.0.2:0      Non-best
  192.168.0.2/32        label:3            label:20065        192.168.0.2:0      Best
                        label:20065        -                  192.168.0.3:0      Non-best
  192.168.1.2/32        label:3            label:20065        192.168.0.2:0      Best
                        label:20065        -                  192.168.0.3:0      Non-best
  192.168.2.2/32        label:3            label:20065        192.168.0.2:0      Best
                        label:20065        -                  192.168.0.3:0      Non-best
<...>

Example 2: Summary view of LDP Binding for the specified prefix

supervisor@rtbrick>SPINE01: op> show ldp binding prefix 192.168.0.2/32
Instance: default, AFI: ipv4
  Prefix                In Label           Out Label          LDP ID             Status
  192.168.0.2/32        label:3            label:20065        192.168.0.2:0      Best
                        label:20065        -                  192.168.0.3:0      Non-best
supervisor@rtbrick>SPINE01: op>

3.1.6. LDP Route

Syntax:

show ldp route <options>

Option	Description
-	Without any option, this command displays a summary of LDP route information.
instance <instance-name>	Displays LDP route information for the specified instance.
instance <instance-name> <afi>	Displays LDP route information for the specified address family and instance. Supported AFI values are 'ipv4' and 'mpls'.
instance <instance-name> ipv4 prefix <ip>	Displays LDP route information for the specified address family of IPv4 prefix and instance.
instance <instance-name> prefix <ip>	Displays LDP route information for the specified prefix and instance.
instance <instance-name> label <label>	Displays LDP route information for the specified mpls label and instance.
instance <instance-name> mpls	Displays LDP route information about MPLS labels.
instance <instance-name> mpls label <label>	Displays LDP route information for the specified MPLS label and instance.
label <label>	Displays LDP route information for the specified mpls label.
ipv4	Displays LDP route information about the IPv4 address family.
ipv4 prefix <ip>	Displays LDP route IPv4 address family information for the specified prefix.
mpls	Displays LDP route information about MPLS labels.
mpls label <label>	Displays LDP route information for the specified MPLS label.
prefix <ip>	Displays LDP route information for the specified prefix address.

Option

Description

Without any option, this command displays a summary of LDP route information.

instance <instance-name>

Displays LDP route information for the specified instance.

instance <instance-name> <afi>

Displays LDP route information for the specified address family and instance. Supported AFI values are 'ipv4' and 'mpls'.

instance <instance-name> ipv4 prefix <ip>

Displays LDP route information for the specified address family of IPv4 prefix and instance.

instance <instance-name> prefix <ip>

Displays LDP route information for the specified prefix and instance.

instance <instance-name> label <label>

Displays LDP route information for the specified mpls label and instance.

instance <instance-name> mpls

Displays LDP route information about MPLS labels.

instance <instance-name> mpls label <label>

Displays LDP route information for the specified MPLS label and instance.

label <label>

Displays LDP route information for the specified mpls label.

ipv4

Displays LDP route information about the IPv4 address family.

ipv4 prefix <ip>

Displays LDP route IPv4 address family information for the specified prefix.

mpls

Displays LDP route information about MPLS labels.

mpls label <label>

Displays LDP route information for the specified MPLS label.

prefix <ip>

Displays LDP route information for the specified prefix address.

Example: Summary view of LDP Route

supervisor@rtbrick>SPINE01: op> show ldp route
Instance: default, AFI: ipv4, SAFI: labeled-unicast
  Prefix/Label         Advertised label  Received label    Next Hop       Interface           Metric
  192.168.0.1/32       3                 -                 -              -                   -
  192.168.0.2/32       20065             -                 12.0.0.2       ifl-0/0/0/1      1000000
  192.168.0.3/32       20067             20067             12.0.0.2       ifl-0/0/0/1      2000001
  192.168.1.1/32       3                 -                 -              -                   -
  192.168.1.2/32       20065             -                 12.0.0.2       ifl-0/0/0/1      1000000
  192.168.1.3/32       20067             20067             12.0.0.2       ifl-0/0/0/1      2000001
  192.168.2.1/32       3                 -                 -              -                   -
  192.168.2.2/32       20065             -                 12.0.0.2       ifl-0/0/0/1      1000000
  192.168.2.3/32       20067             20067             12.0.0.2       ifl-0/0/0/1      2000001
  192.168.3.1/32       3                 -                 -              -                   -
  192.168.3.2/32       20065             -                 12.0.0.2       ifl-0/0/0/1      1000000
  192.168.3.3/32       20067             20067             12.0.0.2       ifl-0/0/0/1      2000001
  192.168.4.1/32       3                 -                 -              -                   -
  192.168.4.2/32       20065             -                 12.0.0.2       ifl-0/0/0/1      1000000
  192.168.4.3/32       20067             20067             12.0.0.2       ifl-0/0/0/1      2000001
<...>

3.1.7. LDP Statistics

Syntax:

show ldp statistics <options>

Option	Description
-	Without any option, the commands displays the LDP statistics for all instances.
instance <instance-name>	Displays LDP statistics information about the specified instance.
instance <instance-name> ldp-id <ldp-id>	Displays LDP statistics information about the specified LDP identifier and instance.

Option

Description

Without any option, the commands displays the LDP statistics for all instances.

instance <instance-name>

Displays LDP statistics information about the specified instance.

instance <instance-name> ldp-id <ldp-id>

Displays LDP statistics information about the specified LDP identifier and instance.

Example: LDP statistics information

supervisor@rtbrick>SPINE01: op> show ldp statistics
Instance: default, LDP ID: 192.168.0.2:0
  Received messages:
    Initialization: 1, KeepAlive: 558, Notification: 0
    Address: 1, Address Withdraw: 0, Label Mapping: 15
    Label Withdraw: 0, Label Release: 0
  Sent messages:
    Initialization: 1, KeepAlive: 558, Notification: 0
    Address: 1, Address Withdraw: 0, Label Mapping: 15
    Label Withdraw: 0, Label Release: 0
Instance: default, LDP ID: 192.168.0.3:0
  Received messages:
    Initialization: 1, KeepAlive: 557, Notification: 0
    Address: 1, Address Withdraw: 0, Label Mapping: 15
    Label Withdraw: 0, Label Release: 0
  Sent messages:
    Initialization: 1, KeepAlive: 557, Notification: 0
    Address: 1, Address Withdraw: 0, Label Mapping: 15
    Label Withdraw: 0, Label Release: 0
supervisor@rtbrick>SPINE01: op>

3.1.8. LDP TCP connection

Syntax:

show ldp tcp connection <options>

Option	Description
-	Without any option, the command displays the TCP connections used by LDP for all instances.
detail	Detailed list view of the the TCP connections.
detail instance <instance-name>	Detailed list view of the the TCP connections of the specified instance.
instance <instance-name>	TCP connections summary of the specified instance.

Option

Description

Without any option, the command displays the TCP connections used by LDP for all instances.

detail

Detailed list view of the the TCP connections.

detail instance <instance-name>

Detailed list view of the the TCP connections of the specified instance.

instance <instance-name>

TCP connections summary of the specified instance.

Example: Summary view of the LDP TCP connections

supervisor@rtbrick>SPINE01: op> show ldp tcp connection
Instance       Local IP             Remote IP            Local port     Remote port   State
default        192.168.0.1          192.168.0.2                 646           64718   Established
default        192.168.0.1          192.168.0.3                 646           64718   Established
supervisor@rtbrick>SPINE01: op>

3.2. LDP Clear Commands

Clear commands allow to reset operational states.

3.2.1. Clear LDP Session

Syntax:

clear ldp session <options>

Option	Description
all	Clears all the LDP sessions.
instance <instance-name> all	Clears all the LDP sessions for the specified instance.
instance <instance-name> peer ldp-id <ldp-id>	Clears the LDP session for the specified instance and peer LDP identifier.

Option

Description

all

Clears all the LDP sessions.

instance <instance-name> all

Clears all the LDP sessions for the specified instance.

instance <instance-name> peer ldp-id <ldp-id>

Clears the LDP session for the specified instance and peer LDP identifier.

Example: The example below shows how to clear all the LDP sessions.

supervisor@rtbrick>SPINE01: op> clear ldp session all
LDP session cleared with instance default
supervisor@rtbrick>SPINE01: op>

3.2.2. Clear LDP Statistics

Syntax:

clear ldp statistics <options>

Option	Description
all	Clears all the LDP statistics.
instance <instance-name> all	Clears all the LDP statistics for the specified instance.
instance <instance-name> peer ldp-id <ldp-id>	Clears the LDP statistics for the specified instance and peer LDP identifier.

Option

Description

all

Clears all the LDP statistics.

instance <instance-name> all

Clears all the LDP statistics for the specified instance.

instance <instance-name> peer ldp-id <ldp-id>

Clears the LDP statistics for the specified instance and peer LDP identifier.

Example: The example below shows how to clear all the LDP statistics.

supervisor@rtbrick>SPINE01: op> clear ldp statistics all
LDP statistics cleared for instance default
supervisor@rtbrick>SPINE01: op>

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