MPLS-LDP Configuration Mode Commands
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
This command configures the Label Advertisement parameters.
Product
GGSN
Privilege
Security Administrator, Administrator
Syntax
[no] advertise-labels { explicit-null | implicit-null }
default advertise-labels
no
This keyword disables the label advertisement parameters.
default
This keyword advertises the labels from the label space allocated for LDP protocol.
explicit-null
This keyword advertises the Explicit NULL label for all the prefixes.
implicit-null
This keyword advertises the Implicit NULL label for all the prefixes.
Usage
Use this to configure advertisement of Implicit NULL or Explicit NULL label for all the prefixes advertised by the system in this context. The default command changes the behavior of label advertisement to default behavior.
Example
Following command configures the MPLS-IP forwarding to advertise the Explicit NULL label for all the prefixes:
advertise-labels explicit-null
Following command configures the MPLS-IP forwarding to advertise the Implicit NULL label for all the prefixes:
advertise-labels implicit-null
 
discovery
Configures the LDP neighbor discovery parameters.
Product
GGSN
Privilege
Security Administrator, Administrator
Syntax
discovery { hello { hello-interval integer_value | hold-interval integer_value } | transport-address ipv4_addr }
no discovery transport-address
default discovery hello
no
This keyword disables the LDP neighbor discovery.
default
This keyword sets the LDP discovery hello interval at 5 seconds and hold interval at 15 seconds.
hello { hello-interval integer_value | hold-interval integer_value }
This keyword is used to configure the LDP Hello parameters.
hello-interval configures the frequency of sending the Discovery Hello packets in seconds. It is an integer value between 5 to 21845.
hold-interval configures Discovery Hold time interval in seconds. It is also an integer value ranging from 15 to 65535.
transport-address ipv4_addr
This keyword configures the LDP transport address. It is an IPv4 address which is represented in dotted decimal notation (###.###.###.###).
Transport address is same as LDP router id.
Usage
This is an optional command and is used to configure LDP peer discovery parameters. LDP discovery hold-interval is always set to three times LDP discovery hello-interval. Transport address is the address used for TCP session over which LDP is running. If transport address is not configured then 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
Use the following command to configure the LDP peer discovery parameters:
discovery hello hello-interval 10discovery hello hold-interval 30discovery transport-address 1.2.3.4
 
enable
Enables the Label Distribution Protocol.
Product
GGSN
Privilege
Security Administrator, Administrator
Syntax
[ no ] enable
no
This keyword disables the LDP protocol.
enable
This keyword enables 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
 
router-id
Configures the Label Distribution Protocol Router ID.
Product
GGSN
Privilege
Security Administrator, Administrator
Syntax
[ no ] router-id IPv4_addr
no
This keyword disables the router ID.
Usage
This command is used to configure LDP router-id. This is an optional parameter. If this is not configured, then the largest operational loopback address is selected as LDP router-id. If LDP has started, then any change will take effect only after disabling and enabling LDP.
ip_address must be an IPv4 address in dotted decimal notation (###.###.###.###).
Example
Use the following command set to configure an LDP router ID:
router-id5.6.7.8
enable
 
end
Exits the current configuration mode and returns to the Exec mode.
Product
HA
Privilege
Security Administrator, Administrator
Syntax
end
Usage
Return to the Exec mode.
 
session
Configures the LDP session parameters.
Product
GGSN
Privilege
Security Administrator, Administrator
Syntax
default session timers
session timers { hold-interval integer_value | keepalive-interval integer_value }
default
This keyword configures the default values for keepalive-interval parameter at 15 and hold-interval parameter at 45.
timers
This keyword configures the LDP session keepalive parameters.
keepalive-interval
This keyword configures the LDP session keepalive parameters. It is an integer value ranging from 15 to 21845.
hold-interval
This keyword configures the Session Hold time interval in seconds. It is also an integer value ranging from 45 to 65535.
Usage
This optional command is used to configure LDP session timers. LDP session hold-interval is always set to three times LDP session Keepalive-interval. The “default” option sets the session Keepalive and hold intervals to the default values.
Example
Use the following commands to configure the LDP session parameters:
session timers keepalive-interval30
session timers hold-interval 45
default session timers
 
exit
Exits the current configuration mode and returns to the global configuration mode.
Product
GGSN
Privilege
Security Administrator, Administrator
Syntax
exit
Usage
Return to the context configuration mode.
 
 
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