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Cisco Bug: CSCus68467 - MDC: DMVPN Tunnel Path-mtu-discovery not working with Jumbo MTU size

Last Modified

May 16, 2018

Products (16)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
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Known Affected Releases

15.5(2)S

Description (partial)

Symptom:
Tunnel Path-MTU-Discovery doesn't work with Jumbo MTU size on DMVPN tunnel interface with IPSec tunnel protection enabled.

Conditions:
Config Jumbo MTU size on DMVPN tunnel interface with IPSec tunnel protection enabled, and enable "tunnel path-mtu-discovery".

Related Community Discussions

<key>CSCus68467</key>: DMVPN Tunnel Path-mtu-discovery not working with Jumbo MTU size
This bugs also exist in Cisco 2911 running  IOS  version 15.4(1)T3 which severely degrade overall network performance and created unnecessary packet fragmentation and wasted massive 30% bandwidth. As the result, this bugs under worst case scenario increase number of packets by doubling it [due to fragmentation] and any single packet lost  will trigger 2-packet to be re-transmission [re-assembly packet will failed if one packet lost and required complete re-transmission].  This practically bring down ...
Latest activity: Jul 18, 2016
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  • Status
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  • Related Community Discussions
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