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Cisco Bug: CSCum70636 - MTU not taken in account in LNS MLPPP with GRE

Last Modified

Feb 28, 2018

Products (17)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco ASR 901-6CZ-FT-D Router
  • Cisco 7600 Series Route Switch Processor 720 with 10 Gigabit Ethernet Uplinks
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Known Affected Releases


Description (partial)

Transport MTU is not set correctly when using GRE over L2TP in a LNS.

on a LNS with  MLPPP, L2TP (between LAC and LNS)  and GRE (between CE and LNS)
In Virtual-template, if we set 1524 as mtu, to have a transport mtu of GRE=1500 it doesn't work.
in this case mtu = ip mtu = 1524.
The problem seems to occur only with MLPPP configured
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