Enabling MPLS LDP-IGP Synchronization on an Interface

Perform the following steps.

  1. In privileged EXEC mode, enter global configuration mode.
    device# configure terminal
  2. Enter the configuration mode to an Ethernet port.
    device(config)# interface ethernet 0/1
  3. Enable IS-IS on an interface.
    device(config-if-eth-0/1)# ip router isis
  4. Enable LDP-IGP synchronization with IS-IS on the interface.
    device(config-if-eth-0/1)# isis ldp-sync enable
  5. Configure the OSPF area on the interface.
    device(config-if-eth-0/1)# ip ospf area 0.0.0.0
  6. Enable LDP-IGP synchronization with OSPF on the interface.
    device(config-if-eth-0/1)# ip ospf ldp-sync enable
  7. Verify LDP-IGP synchronization with IS-IS on the interface.
    device# show isis interface
    Total number of IS-IS Interfaces: 5
    
    Interface: eth 0/1
    Circuit State: UP Circuit Mode: LEVEL-1-2
    Circuit Type: BCAST Passive State: FALSE Circuit Number: 3, MTU: 1500
    Level-1 Auth-mode: None
    Level-2 Auth-mode: None
    Level-1 Metric: 10, Level-1 Priority: 64
    Level-1 Hello Interval: 10 Level-1 Hello Multiplier: 3
    Level-1 Designated IS: R2-03 Level-1 DIS Changes: 
    Level-2 Metric: 10, Level-2 Priority: 64
    Level-2 Hello Interval: 10 Level-2 Hello Multiplier: 3
    Level-2 Designated IS: R2-03 Level-2 DIS Changes: 2
    Next IS-IS LAN Level-1 Hello in 7 seconds 
    Next IS-IS LAN Level-2 Hello in 3 seconds 
    Number of active Level-1 adjacencies: 0
    Number of active Level-2 adjacencies: 0
    Circuit State Changes: 1 Circuit Adjacencies State Changes: 0
    Rejected Adjacencies: 0
    Circuit Authentication L1 failures: 0
    Circuit Authentication L2 failures: 0
    Bad LSPs: 0
    Control Messages Sent: 40 Control Messages Received: 0
    Hello Padding: Enabled
    IP Enabled: TRUE IP Addresses:
       10.30.30.2/28
    IPv6 Enabled: FALSE 
    MPLS TE Enabled: FALSE
    LDP-SYNC: Enabled, State:
    
  8. Verify LDP-IGP synchronization with OSPF on the interface.
    device# show ip ospf
    OSPF Version Version 2
    Router Id 10.1.1.2
    ASBR Status No
    ABR Status No (0)
    Redistribute Ext Routes from
    Initial SPF schedule delay 0 (msecs)
    Minimum hold time for SPFs 0 (msecs)
    Maximum hold time for SPFs 0 (msecs)
    External LSA Counter 0
    External LSA Checksum Sum 00000000
    Originate New LSA Counter 9
    Rx New LSA Counter 6
    External LSA Limit 174762
    Database Overflow Interval 0
    Database Overflow State : NOT OVERFLOWED
    RFC 1583 Compatibility : Enabled
    Slow neighbor Flap-Action : Disabled, timer 300
    Nonstop Routing: Disabled
    Graceful Restart: Disabled, timer 120
    Graceful Restart Helper: Enabled
    LDP-SYNC: Globally enabled, Hold-down time 66 sec
    Interfaces with LDP-SYNC enabled:
    eth 0/1 

Example

The following example shows the previous steps.

device# configure terminal
device(config)# interface e 0/1
device(config-if-eth-0/1)# ip router isis
device(config-if-eth-0/1)# isis ldp-sync enable
device(config-if-eth-0/1)# ip ospf area 0.0.0.0
device(config-if-eth-0/1)# ip ospf ldp-sync enable