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ISIS authentication problem with Alcatel routers

we have the following topology

7750 SR7 (6.1 R6) PE ---- (CISCO XR 12410 IOS 3.6.1) P --- CISCO 7200 NPEG2 with 12.2.33 SRC3 IOS version PE

adjacency & LSPs are ok between 7750 PE & CISCO P. but with LSPs authentication error on CISCO PE.

7750 PE have no problems receiveing everything .

- If we disable received authentication on any of the Cisco PE routers every thing work normally

Is there a possibility that XR P router is changing the authentication key?

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