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Cisco Bug: CSCul07295 - ip mtu adjust should consider PPP header length for mtu calculation

Last Modified

Apr 18, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(4)S2

Description (partial)

Symptom:
With L2TPv2, the LNS uses an incorrect mtu of 1464 bytes instead of 1460 bytes on Virtual-Access Interface. 
This can cause large packets to be blackholed or post-encapsulation fragmentation.

Conditions:
This problem occurs with "ip mtu adjust" under the vdpn-group.
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