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[M/MX/T] Inter-domain LSP optimization behavior

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Article ID: KB33481 KB Last Updated: 07 Dec 2018Version: 1.0
Summary:

This article describes RSVP Label Switched Path (LSP) optimization behavior in an inter-domain setup.

Symptoms:

The RSVP LSPs formed over multi-area OSPF using inter-domain knob as shown below under the configuration hierarchy will not support automatic re-optimization of LSP paths when a best path becomes available.

lab@R1> show configuration protocols mpls 
label-switched-path to_R5 {
    to 192.168.1.5;
    optimize-timer 30;
    inter-domain;
    adaptive;
}
Solution:

By default, LSP reoptimization to best path happens as per the configured or default optimization interval for a specified LSP.  However, in case of inter-domain set up, it will be required to clear the Label switch path using the command, 'clear mpls lsp <lsp-name>' manually for the LSP to select the newly available best path.

At this time, it can be observed that the LSP and IGP paths are different.
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