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Cisco Bug: CSCvs25709 - Traceback isis:ROUTING-ISIS-3-INTERNAL_ERR : isis_get_exp_tun_ifhandle: AF 1 is NOT supported

Last Modified

Jun 17, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.5.3.ROUT 6.6.2.ROUT 6.6.3.BASE 7.0.2.BASE

Description (partial)

During IPv6 microloop avoidance route computation, ISIS INTERNAL_ERR message "isis_get_exp_tun_ifhandle: AF 1 is NOT supported" is found in syslog.

- microloop avoidance configured and triggered (link up or link down) for IPv6
- a backup tunnel is required for the explicit path (number of required repair labels exceeding max that rib can handle)
- the limit is platform specific and can be found by (PRI below) : 
  sh isis interface <>
     MPLS Max Label Stack:   1/3/10/10 (PRI/BKP/SRTE/SRAT)
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