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Cisco Bug: CSCun73533 - "pppoe mtu pppoe unlimited" command is not working for the MTU 1500

Last Modified

Apr 18, 2019

Products (17)

  • Cisco IOS
  • Cisco 7206 Router
  • Cisco 7301 Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco 7204 Router
  • Cisco 7206VXR Router
  • Cisco 7202 Router
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco ME 3600X-24CX-M Switch
  • Cisco 7600 Series Route Switch Processor 720 with 10 Gigabit Ethernet Uplinks
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Known Affected Releases

15.2(4)S2

Description (partial)

Symptom:
"pppoe mtu pppoe unlimited" command supports the larger MTU sessions
greater than the 1492 for the PPPoE Subscriber sessions.

 Even though:

1. "pppoe mtu pppoe unlimited" command is configured under Virtual-Template
2. "mtu 1500" command is configured under Virtual-Template
3. MTU 1500 is agreed upon during LCP

Virtual Access Interface(VAI) interface for the subscriber session will be cloned with 1492 MTU.

Conditions:
This issue is seen only when MTU is Exactly 1500.

Any MTU value greater than 1500 works fine.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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