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Cisco Bug: CSCuj80315 - Main interface MTU refered instead of subinterface ipv4 mtu for OSPF LSU

Last Modified

Jan 09, 2017

Products (1)

  • Cisco 12000 Series Routers

Known Affected Releases

4.1.1.FWDG

Description (partial)

Symptom:
GSR XR box sending 1552byte OSPF LSUpdates unfragmented without honoring IPv4 mtu (1500 bytes) settings on sub interfaces. Using the physical MTU set on main interface (mtu 1600bytes) instead.

Conditions:
Main interface MTU set higher  than subinterface ipv4 interface setting.
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