> MPLS-LDP Configuration Mode Commands
> The MPLS-LDP Configuration Mode is used to configure Label Distribution Protocol (LDP) specific parameters for MPLS-IP forwarding.
> advertise-labels
> Configures the Label Advertisement parameters.
> Product
> GGSN, P-GW
> Privilege
> Security Administrator, Administrator
> Syntax
> [no] advertise-labels { explicit-null | implicit-null }
> default advertise-labels
> no
> Disables the label advertisement parameters.
> default
> Advertises the labels from the label space allocated for LDP protocol.
> explicit-null
> Advertises the Explicit NULL label for all the prefixes.
> implicit-null
> Advertises the Implicit NULL label for all the prefixes.
> Usage
> Use this to configure advertisement of the Implicit NULL or Explicit NULL label for all the prefixes advertised by the system in this context.
> Example
> The following command configures the MPLS-IP forwarding to advertise the Explicit NULL label for all the prefixes:
> advertise-labels explicit-null
> The following command configures the MPLS-IP forwarding to advertise the Implicit NULL label for all the prefixes:
> advertise-labels implicit-null
> discovery
> Configures the Label Distribution Protocol (LDP) neighbor discovery parameters.
> Product
> GGSN, P-GW
> Privilege
> Security Administrator, Administrator
> Syntax
> discovery { hello { hello-interval integer_value | hold-interval integer_value } | transport-address ipv4_addr }
> default discovery hello
> no discovery transport-address
> default
> Sets the LDP discovery hello interval at 5 seconds and hold interval at 15 seconds.
> no
> Disables the LDP neighbor discovery.
> hello { hello-interval integer_value | hold-interval integer_value }
> Configures the LDP Hello parameters.
> hello-interval configures the frequency of sending the Discovery Hello packets in seconds.
> integer_value is an integer from 5 through 21845.
> Default: 5
> hold-interval configures the Discovery Hold time interval in seconds.
> integer_value is an integer from 15 through 65535.
> Default: 15
> transport-address ipv4_addr
> Configures the LDP transport address as an IPv4 address entered in dotted-decimal notation. Transport address is the same as the LDP router ID.
> Usage
> This is an optional command that is used to configure LDP peer discovery parameters. The LDP discovery hold-interval is always set to three times the LDP discovery hello-interval. Transport address is the address used for the TCP session over which LDP is running. If the transport address is not configured, the LDP router-id is used as transport address. Any update to transport address will take effect only if LDP is disabled and re-enabled. The “default” option sets the hello intervals to the default values.
> Example
> The following command sequence configures the LDP peer discovery parameters:
> discovery hello hello-interval 10discovery hello hold-interval 30discovery transport-address 10.2.3.4
> enable
> Enables the Label Distribution Protocol (LDP).
> Product
> GGSN, P-GW
> Privilege
> Security Administrator, Administrator
> Syntax
> [ no ] enable
> no
> Disables the LDP protocol.
> Usage
> This command is used to enable or disable the LDP protocol. By default the LDP protocol is disabled.
> Example
> Use the following command to enable the LDP protocol:
> enable
> end
> Exits the current configuration mode and returns to the Exec mode.
> Product
> All
> Privilege
> Security Administrator, Administrator
> Syntax
> end
> Usage
> Use this command to return to the Exec mode.
> exit
> Exits the current mode and returns to the parent configuration mode.
> Product
> All
> Privilege
> Security Administrator, Administrator
> Syntax
> exit
> Usage
> Use this command to return to the parent configuration mode.
> router-id
> Configures the Label Distribution Protocol Router ID.
> Product
> GGSN, P-GW
> Privilege
> Security Administrator, Administrator
> Syntax
> router-id ipv4_addr
> no router-id
> no
> Disables the router ID.
> ipv4_addr
> Must be an IPv4 address entered in dotted-decimal notation.
> Usage
> This command is used to configure the LDP router-id. This is an optional parameter. If the ID is not configured, the largest operational loopback address is selected as the LDP router ID. If LDP has started, any change will take effect only after disabling and enabling LDP.
> Example
> The following command sequence configures an LDP router ID:
> router-id 10.2.3.4
> session
> Configures the LDP session parameters.
> Product
> GGSN, P-GW
> Privilege
> Security Administrator, Administrator
> Syntax
> session timers { hold-interval integer_value | keepalive-interval integer_value }
> default session timers
> default
> Configures the default values for hold-interval parameter at 45 and keepalive-interval parameter at 15.
> timers
> Configures the LDP session keepalive parameters.
> hold-interval integer_value
> Configures the session hold time interval in seconds.
> integer_value is an integer from 45 through 65535.
> Default: 45
> keepalive-interval integer_value
> Configures the frequency of sending keepalive packets in seconds.
> integer_value is an integer from 15 through 21845.
> Default: 15
> Usage
> This optional command is used to configure LDP session timers. LDP session hold-interval is always set to three times the LDP session keepalive-interval. The “default” option sets the session keepalive and hold intervals to the default values.
> Example
> The following command sequence configures the LDP session parameters:
> session timers keepalive-interval 30
> session timers hold-interval 45
> default session timers

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