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PA-E3 Serial Port Adaptor - Default MTU

Have a 7206 with a PA-E3 card. 2 Ports. Have many sub interfaces (se2/1.xx) which configured for Frame. Need to change the MTU on the main port, se2/1. Does anyone know what the default MTU is on this card, 1500 or 4470?

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Re: PA-E3 Serial Port Adaptor - Default MTU

Default for FR should be 1600, check with show interface se2/1.xx and show ip interface se2/1.xx.

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