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Cisco Bug: CSCvv05046 - MTU on PPPoA not reaching 1500

Last Modified

Sep 02, 2020

Products (1)

  • Cisco 1000 Series Integrated Services Routers

Known Affected Releases

16.9.4

Description (partial)

This behavior was related to the bug CSCva13768 so this must be analyzed to confirm if it is feasible to "fix"

Symptom:
When migrating from IOS to IOS-XE, the configuration of the MTU on a PPPoA scenario will not allow an MTU of 1500 due to a limitation found on the dialer interface,the default highest will be 1492.
On Classic IOS it works, while on IOS-XE we find this limitation.

Conditions:
When PPPoA is used on the router, the configuration will take part of the dialer capabilities which are limited for PPPoE
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