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Cisco Bug: CSCvt06921 - [cups] MTU value in RA is different in packet-too-big

Last Modified

Oct 02, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.12.18 21.16.3 21.16.c7.74145 21.16.c9 21.16.d0 21.19.0 21.19.n1

Description (partial)

Symptom:
Cisco ASR5xxx PGW generates router advertisement packet with the value of MTU size being the same as data tunnel MTU configured under the APN instead of the actual packet length supported

Conditions:
Cisco ASR5xxx PGW should be configured with default APN configuration having <i> data tunnel mtu 1500  </i> 
IPv6 subscriber session should be established.
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