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Before You Begin
This section includes the following topics:
General Preparation
To use the J-Web interface and CLI operational tools, you must have the appropriate access privileges. For more information about configuring access privilege levels, see Adding New Users and the Junos System Basics Configuration Guide.
Ping MPLS Preparation
Before using the ping MPLS feature, make sure that the receiving interface on the VPN or LSP remote endpoint has MPLS enabled, and that the loopback interface on the outbound node is configured as 127.0.0.1. The source address for MPLS probes must be a valid address on the J Series device.
MPLS Enabled
To process ping MPLS requests, the remote endpoint of the VPN or LSP must be configured appropriately. You must enable MPLS on the receiving interface of the outbound node for the VPN or LSP. If MPLS is not enabled, the remote endpoint drops the incoming request packets and returns an “ICMP host unreachable” message to the J Series device.
Loopback Address
The loopback address (lo0) on the outbound node must be configured as 127.0.0.1. If this interface address is not configured correctly, the outbound node does not have this forwarding entry. It drops the incoming request packets and returns a “host unreachable” message to the J Series device.
Source Address for Probes
The source IP address you specify for a set of probes must be an address configured on one of the J Series device interfaces. If it is not a valid J Series device address, the ping request fails with the error message “Can't assign requested address.”
