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Configuring LDP Native IPv6 Support

LDP is supported in an IPv6-only network, and in an IPv6 or IPv4 dual-stack network as described in RFC 7552. Configure the address family as inet for IPv4 or inet6 for IPv6 or both, and the transport preference to be either IPv4 or IPv6. The dual-transport statement allows Junos OS LDP to establish the TCP connection over IPv4 with IPv4 neighbors, and over IPv6 with IPv6 neighbors as a single-stack LSR. The inet-lsr-id and inet6-lsr-id IDs are the two LSR IDs that have to be configured to establish an LDP session over IPv4 and IPv6 TCP transport. These two IDs should be non-zero and must be configured with different values.

Before you configure IPv6 as dual-stack, be sure you configure the routing and signaling protocols.

To configure LDP native IPv6 support, you must do the following:

  1. Enable forwarding equivalence class (FEC) deaggregation in order to use different labels for different address families.
  2. Configure LDP address families.
  3. Configure the transport-preference statement to select the preferred transport for the TCP connection when both IPv4 and IPv6 are enabled. By default, IPv6 is used as the TCP transport for establishing an LDP connection.
  4. (Optional) Configure dual-transport to allow LDP to establish a separate IPv4 session with an IPv4 neighbor, and an IPv6 session with an IPv6 neighbor. Configure inet-lsr-id as the LSR ID for IPv4, and inet6-lsr-id as the LSR ID for IPv6.

    For example, configure inet-lsr-id as 10.255.0.1, and inet6-lsr-id as 10.1.1.1.