ttl propagate vpn

Function

The ttl propagate vpn command enables IP TTL propagation for MPLS packets of the VPN.

The undo ttl propagate vpn command disables IP TTL propagation for MPLS packets of the VPN.

By default, IP TTL propagation is disabled for VPN packets.

Format

ttl propagate vpn

undo ttl propagate vpn

Parameters

None

Views

MPLS view

Default Level

2: Configuration level

Usage Guidelines

The ttl propagate vpn and undo ttl propagate vpn commands only take effect on LSPs that are to be set up. Before using the function on LSPs that have been set up, run the reset mpls ldp command to reestablish the LSPs.

Configure the IP TTL propagation consistently on all PEs. If you enable the IP TTL propagation only on some PEs, the traceroute output cannot reflect the real network situation.

Example

# Enable the IP TTL propagation for MPLS packets of the VPN.

<HUAWEI> system-view
[HUAWEI] mpls
[HUAWEI-mpls] ttl propagate vpn