Juniper Networks J-Series manual General Preparation, Ping Mpls Preparation, Mpls Enabled

Chapter 12: Using Services Router Diagnostic Tools

Before You Begin

This section includes the following topics:

■General Preparation on page 215

■Ping MPLS Preparation on page 215

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” on page 11 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 Services Router.

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 Services Router. To enable MPLS on an interface, see the J-series Services Router Advanced WAN Access Configuration Guide.

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 Services Router. If the outbound node is a Services Router, see the J-series Services Router Advanced WAN Access Configuration Guide to configure the loopback address.

Source Address for Probes

The source IP address you specify for a set of probes must be an address configured on one of the Services Router interfaces. If it is not a valid Services Router address, the ping request fails with the error message “Can't assign requested address.”

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