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ultimate-hop-popping

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 12.3.

Statement introduced in Junos OS Release 13.2 for PTX Series Packet Transport Routers.

Description

Enable ultimate-hop popping on LSPs. Configure this statement on the device at the LSP ingress. In ultimate-hop popping, the MPLS label is popped from the IP packet at the PE router. The IP address is checked in a second address lookup (also at the PE router), and then the packet is forwarded to its destination.

Be aware of the following platform requirements and restrictions:

  • UHP LSPs using VT interfaces—Supported on all M Series, MX Series, T Series, and TX Matrix routers.

  • UHP LSPs using LSI interfaces—Supported on MX 3D Series routers only.

  • UHP LSP requirements for the egress PE device—For M Series and T Series routers, a VT interface is needed.

  • UHP LSPs and Layer 3 VPNs—UHP LSPs are supported for Layer 3 VPNs configured on MX 3D Series routers only.

  • UHP LSPs and VPLS—UHP LSPs are supported for VPLS configured on MX 3D Series routers only. You must configure the no-tunnel-services statement at the [edit routing-instances routing-instance-name protocols vpls] hierarchy level.

Default

Ultimate-hop popping is disabled by default on LSPs. Penultimate-hop popping is the default behavior. In penultimate-hop popping, the final MPLS label is popped from the IP packet at the last provider router in the network before being forwarded to the PE router. The PE router receives the packet and checks the IP address, and then the packet is forwarded to its destination.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.