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topology, this behavior might result in premature termination of the ping or trace.

You can use the bottom-label-ttl keyword to avoid this problem.

Packet Flows to L3VPN IPv6 Prefixes

Packet flow for an MPLS ping and trace to an L3VPN IPv6 prefix is the same as for

an IPv4 prefix except that the echo request packets and echo reply packets contain

the VPN IPv6 sub-TLV instead of the VPN IPv4 sub-TLV.

Related Topics ■ Verifying and Troubleshooting MPLS Connectivity on page 367

■ ping mpls ip

■ ping mpls l2transport

■ ping mpls l3vpn

■ ping mpls rsvp tunnel

■ ping mpls vpls

■ trace mpls ip

■ trace mpls l2transport

■ trace mpls l3vpn

■ trace mpls rsvp tunnel

■ trace mpls vpls

Troubleshooting MTU Problems in Point-to-Point LSPs

In an MPLS-enabled network with point-to-point LSPs, you can use the data-size

keyword with the ping mpls command to detect MTU failures in different types of

MPLS applications and network topologies. You can use the data-size keyword to

troubleshoot MTU problems in point-to-point MPLS LSPs to determine whether MPLS

packets with a particular size can be forwarded over an MPLS point-to-point LSP,

when the size of the packets exceeds the MTU size at any of the LSRs that are nodes

of the LSP. If you specify the packet size for MPLS echo requests, you can determine

the exact LSR where the MTU size is exceeded and the MPLS packets are discarded.

Tasks to verify and troubleshoot MTU problems in point-to-point LSPs are:

■ Troubleshooting MTU Problems in a Point-to-Point MPLS LSP Associated with

an IP or IPv6 Address on page 377

■ Troubleshooting MTU Problems in a Point-to-Point MPLS LSP Associated with

an L3VPN IP or IPv6 Prefix on page 377

■ Troubleshooting MTU Problems in a Point-to-Point MPLS LSP Associated with a

Martini Circuit on page 377

■ Troubleshooting MTU Problems in a Point-to-Point MPLS LSP Associated with

an RSVP-TE Tunnel on page 377

■ Troubleshooting MTU Problems in a Point-to-Point MPLS LSP Associated with a

VPLS Instance on page 378

376 ■ Troubleshooting MTU Problems in Point-to-Point LSPs

JUNOSe 11.1.x BGP and MPLS Configuration Guide

Juniper BGP - CONFIGURATION GUIDE V 11.1.X User Manual

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