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    Configuring Label Distribution Protocol (NSM Procedure)

    The Label Distribution Protocol (LDP) is a protocol for distributing labels in non-traffic-engineered applications. LDP allows routers to establish label-switched paths (LSPs) through a network by mapping network-layer routing information directly to data link layer-switched paths.

    To configure LDP in NSM:

    1. In the navigation tree select Device Manager > Devices.
    2. In the Devices list, double-click the device to select it.
    3. In the Configuration tab, expand Protocols > LDP.
    4. Add or modify the settings as specified in Table 1.
    5. Click one:
      • OK — To save the changes
      • Cancel — To cancel the modifications

    Table 1: LDP Configuration Details

    TaskYour Action

    Configure LDP.

    1. In the Comment box, enter the comment.
    2. From the Preference list, select the route preference level for LDP routes.

      Range: 0 through 4,294,967,295

    3. Select the No Forwarding check box to omit the Ingress routes from the inet.o routing table.
    4. Select the L2 Smart Policy check box to prevent LDP from exporting IPv6 FECs over sessions with layer 2 neighbors.
    5. Select the Track IGP Metric check box to cause the IGP route metric to be used for the LDP routes instead of the default LDP route metric.
    6. Select the Strict Targeted Hellos check box to prevent LDP sessions from being established with remote neighbors that have not been specifically configured.
    7. Select one of the following:
      • deaggregate—To control forwarding equivalence class (FEC) deaggregation on the router.
      • no-deaggregate—To control forwarding equivalence class (FEC) aggregation on the router.
    8. Select the Explicit Null check box to advertise label 0 to the egress router of a label-switched path (LSP).
    9. From the Label Withdrawal Delay list, select the number of seconds to wait before withdrawing labels for the LDP LSPs.

      Default: 60 seconds

      Range: 0 through 120 seconds

    10. From the Keep Alive Interval list, select a Keep Alive value.

      Range: 1 through 65,535 seconds

      Default: 10 seconds

    11. From the Keep Alive Timeout list, select a Keep Alive Timeout value.

      Range: 1 through 65,535 seconds

      Default: 30 seconds

    Configure the prefixes advertised into LDP from the routing table.

    1. Expand LDP.
    2. Click Egress Policy next to LDP.
    3. Click Add after selecting a policy member from the Non member list to add it to the Members list.
    4. Click Remove after selecting a policy from the Members list to remove it from the Members list.
    5. Click Add All to add all the Non members to the Members list.
    6. Click Remove All to remove all the members from the Members list.

    Apply policy filters to outbound LDP label bindings.

    1. Click Export next to LDP.
    2. Click Add after selecting a policy member from the Non-member list to add it to the Members list.
    3. Click Remove after selecting the policy from the Members list to remove it from the Members list.
    4. Click Add All to add all the Non-members to the Members list.
    5. Click Remove All to remove all the members from the Members list.

    Enable LDP graceful restart on the LDP master protocol instance or for a specific routing instance.

    1. Click Graceful Restart next to LDP.
    2. Select the Disable check box to explicitly disable LDP on an interface, or explicitly disable LDP graceful restart.
    3. Select the Helper Disable check box to disable helper mode for LDP graceful restart.
    4. From the Recovery Time list, select the amount of time a router waits for LDP to restart gracefully.

      Range: 120 through 1800 seconds

      Default: 140 seconds

    5. From the Maximum Neighbor Recovery Time list, select the maximum amount of time to wait before giving up an attempt to gracefully restart.

      Range: 120 through 1900 seconds

      Default: 140 seconds

    6. From the Reconnect Time list, select the reconnect time.

      Range: 30 through 300

    7. From the Maximum Neighbor Reconnect Time list, select the maximum time allowed for reconnection.

      Range: 30 through 300

    Apply policy filters to received LDP label bindings.

    1. Click Import next to LDP.
    2. Click Add after selecting a policy member from the Non-member list to add it to the Members list.
    3. Click Remove after selecting a policy from the Members list to remove it from the Members list.
    4. Click Add All to add all the Non-members to the Members list.
    5. Click Remove All to remove all the members from the Members list.

    Enable LDP on one or more router interfaces.

    1. Click Interface next to LDP.
    2. Click Add new entry next to Interface.
    3. In the Name box, enter the name of the interface.
    4. Select the Disable check box to disable LDP on the interface.
    5. From the Hello Interval list, select a value to control the rate at which hello messages are sent on the interface.

      Range:1 through 65,535 seconds

      Default: 5 seconds for link hello messages, 15 seconds for targeted hello messages

    6. From the Hold Time list, select a hold time to specify how long an LDP node should wait for a hello message before declaring a neighbor to be down.

      Range: 1 through 65,535 seconds

      Default: 15 seconds for link hello messages, 45 seconds for targeted hello messages

    7. From the Transport Address list, select the transport address. Select one of the following:
      • router-id—The router identifier is used as the transport address
      • interface—The first IP address on the interface is used as the transport address
    8. Select one of the following:
      • Allow-Subnet-Mismatch—To ignore the LDP subnet check.
      • No-Allow-Subnet-Mismatch—To enable the LDP subnet check.

    Disable LDP traps.

    1. Click Log Updown next to LDP.
    2. In the Comment box, enter the comment.
    3. Click Trap next to Log Updown.
    4. In the Comment box, enter the comment.
    5. Select the Disable check box to disable LDP traps.

    Specify merged next-hop policy.

    1. Click Next Hop next to LDP.
    2. In the Comment box, enter the comment.
    3. Click Merged next to Next Hop.
    4. In the Comment box, enter the comment.
    5. Click Policy next to Merged.
    6. Click Add after selecting a policy member from the Non member list to add it to the Members list.
    7. Click Remove after selecting a policy from the Members list to remove it from the Members list.
    8. Click Add All to add all the Non members to the Members list.
    9. Click Remove All to remove all the members from the Members list.

    Enable OAM for all of the LDP LSPs or for a specific LDP LSP.

    1. Click Oam next to LDP.
    2. In the Comment box, enter the comment.
    3. From the Lsp Ping Interval list, select the time interval between LSP ping messages.

      Range : 30 through 3600

    4. Click Bfd Liveness Detection next to Oam.
    5. In the Comment box, enter the comment.
    6. From the Version list, select the BFD protocol version to detect.

      Range: 1 (BFD version 1), or automatic (autodetection) Default: automatic

    7. From the Minimum Interval list, select the minimum transmit and receive interval.

      Range: 1 through 255,000

    8. From the Minimum Receive Interval list, select the minimum receive interval.

      Range: 1 through 255,000

    9. From the Multiplier list, select the detection time multiplier.

      Range: 1 through 255

      Default: 3

    10. Select the No Adaptation check box to disable BFD adaptation.
    11. Select the Ecmp check box to cause RSVP to establish BFD sessions for all ECMP paths configured for the specified FEC.
    12. From the Holddown Interval list, select the time the BFD session must remain up before state change notification is sent.

      Range: 1 through 255000

    13. Click Detection Time next to Bfd Liveness Detection.
    14. In the Comment box, enter the comment.
    15. From the Threshold list, select the time the BFD session must remain up before state change notification is sent.

      Range: 1 through 4294967295

    Configure route and next-hop properties in the event of a BFD session failure event on an LDP LSP.

    1. Click Failure Action next to Bfd Liveness Detection.
    2. In the Comment box, enter the comment.
    3. Select one of the following:
      • remove-route—To remove LDP route from the ribs
      • remove-nexthop—To remove LDP nexthop from the route
    4. Click Transmit Interval next to Bfd Liveness Detection.
    5. In the Comment box, enter the comment.
    6. From the Minimum Interval list, select the minimum transmit and receive interval.

      Range: 1 through 255,000

    7. From the Threshold list, select the time the BFD session must remain up before state change notification is sent.

      Range: 1 through 4294967295

    Enable Bidirectional Forwarding Detection (BFD) for all MPLS LSPs or for just a specific LSP.

    1. Click Fec next to Oam.
    2. In the Name box, enter the forwarding equivalence class (FEC) address.
    3. In the Comment box, enter the comment.
    4. Click Bfd Liveness Detection next to Fec.
    5. Select one of the following:
      • bfd-liveness-detection—To enable BFD for all MPLS LSPs or for just a specific LSP.
      • no-bfd-liveness-detection—To disable BFD for all MPLS LSPs or for just a specific LSP.
    6. Click Periodic Traceroute next to fec.
    7. In the Comment box, enter the comment.
    8. From the Frequency list, select the interval between traceroute attempts.

      Range: 15 through 120 minutes

    9. From the Ttl list, select the maximum time-to-live value.

      Range: 1 through 255

    10. From the Retries list, select the number of attempts to send a probe to a specific node before giving up.

      Range: 1 through 9

    11. From the Wait list, select the wait interval before resending a probe packet.

      Range: 5 though 15 seconds

    12. From the Paths list, select the maximum number of paths to search.

      Range: 1 through 255

    13. In the Source box, enter the IPv4 source address to use when sending probes.
    14. From the Exp list, select the class of service to use when sending probes.

      Range: 0 through 7

    15. From the Fanout list, select the maximum number of next hops to search per node.

      Range: 1 through 16

    16. Select Disable check box to disable tracing for a specific FEC.

      Range: 1 through 16

    Enable an OAM ingress policy.

    1. Click Ingress Policy next to Oam.
    2. Click Add after selecting a policy member from the Non member list to add it to the Members list.
    3. Click Remove after selecting a policy from the Members list to remove it from the Members list.
    4. Click Add All to add all the Non members to the Members list.
    5. Click Remove All to remove all the members from the Members list.

    Enable tracing of forwarding equivalence classes (FECs) for LDP LSPs.

    1. Click Periodic Traceroute next to Oam.
    2. In the Comment box, enter the comment.
    3. From the Frequency list, select the interval between traceroute attempts.

      Range: 15 through 120 minutes

    4. From the Ttl list, select the maximum time-to-live value.

      Range: 1 through 255

    5. From the Retries list, select the number of attempts to send a probe to a specific node before giving up.

      Range: 1 through 9

    6. From the Wait list, select the wait interval before resending a probe packet.

      Range: 5 though 15 seconds

    7. From the Paths list, select the maximum number of paths to search.

      Range: 1 through 255

    8. In the Source box, enter the IPv4 source address to use when sending probes.
    9. From the Exp list, select the class of service to use when sending probes.

      Range: 0 through 7

    10. From the Fanout list, select the maximum number of next hops to search per node.

      Range: 1 through 16

    Enable policing of forwarding equivalence classes (FECs) for LDP.

    1. Click Policing next to Ldp.
    2. In the Comment box, enter the comment.
    3. Click Fec next to Policing.
    4. Click Add new entry next to Fec.
    5. In the Name box, enter the address for the FEC.
    6. In the Comment box, enter the comment.
    7. From the Ingress Traffic list, select the name of the filter for policing ingress FEC traffic.
    8. From the Transit Traffic list, select the name of the filter for policing transit FEC traffic.

    Specify the LDP session to which you want to attach the Transmission Control Protocol (TCP) MD5 signature.

    1. Click Session next to Ldp.
    2. Click Add new entry next to Session.
    3. In the Name box, enter the address for the remote end of the LDP session.
    4. In the Comment box, enter the comment.
    5. In the Authentication Key box, enter the authentication key.
    6. From the Authentication Algorithm list, select the algorithm.
    7. In the Authentication Key Chain box, enter the MD5 authentication signature. The maximum length of the authentication signature is 69 characters.

    Configure session protection.

    1. Click Session Protection next to Ldp.
    2. From the Timeout list, select the session protection timeout.

      Range: 1 through 65535

    Specify parameters for targeted hellos.

    1. Click Targeted Hello next to Ldp.
    2. In the Comment box, enter the comment.
    3. From the Hello Interval list, select the hello interval in seconds.

      Range: 1 through 65535

    4. From the Hold Time list, select the hold time interval in seconds.

      Range: 1 through 65535

    Configure LDP protocol-level trace options.

    1. Click Traceoptions next to Ldp.
    2. In the Comment box, enter the comment for the traceoptions.
    3. Click File next to Traceoptions.
    4. In the Comment box, enter the comment for the file.
    5. In the Filename box, enter the name of the file to receive the output of the tracing operation.
    6. In the Size box, enter the maximum size of each trace file, in kilobytes (KB), megabytes (MB), or gigabytes (GB).
    7. From the Files list, select the maximum number of trace files.

      Range: 2 through 1000

    8. Select one of the following:
      • world-readable—To enable unrestricted file access.
      • no-world-readable—To restrict file access to owner. This is the default setting.

    Configure LDP traffic statistics.

    1. Click Traffic Statistics next to Ldp.
    2. In the Comment box, enter the comment.
    3. From the Interval list, select the interval at which the statistics are polled and written to the file.

      Range: 60 through 65535

    4. Select No Penultimate Hop check box to disable penultimate hop statistics collection.
    5. Click File next to Traffic Statistics.
    6. In the Comment box, enter the comment for the file.
    7. In the Filename box, enter the name of the file to receive the output of the tracing operation.
    8. In the Size box, enter the maximum size of each trace file, in kilobytes (KB), megabytes (MB), or gigabytes (GB).
    9. From the Files list, select the maximum number of trace files.

      Range: 2 through 1000

    10. Select one of the following:
      • world-readable—To enable unrestricted file access.
      • no-world-readable—To restrict file access to owner. This is the default setting.

    Allow control of the transport address used by LDP.

    1. Click Transport Address next to Ldp.
    2. In the Comment box, enter the comment.
    3. Click Router Id next to Transport Address.
    4. Select one of the following:
      • router-id—The router identifier is used as the transport address.
      • interface—The first IP address on the interface is used as the transport address.
      • address—IP address to be advertised as the transport address.

    Published: 2013-01-02