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Tracing LDP Protocol Traffic Within FEC

You can trace LDP protocol traffic within a specific FEC. You can filter LDP trace statements based on a FEC. The following trace flags are available for this purpose: route, path, and binding.

The following example illustrates how you might configure the LDP traceoptions statement to filter LDP trace statements based on a FEC:



[edit protocols ldp traceoptions]
flag route filter match-on fec policy "filter-policy-for-ldp-fec";

This feature has the following limitations:

The filtering capability is only available for FECs composed of IP version 4 (IPv4) prefixes.
Layer 2 circuit FECs cannot be filtered.
When you configure both route tracing and filtering, Multiprotocol Label Switching (MPLS) routes are not displayed (they are blocked by the filter).
Filtering is determined by the policy and the configured value for the match-on option. When configuring the policy, be sure that the default behavior is always reject.
The only match-on option is fec. Consequently, the only type of policy you should include is a route-filter policy.

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