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snmp and ifspeed

I am confused about the value that is returned in a snmp query to the 4250-sx for the interface speed. Could you please help me to understand? When I query the ids 5.1 x sensor with snmpwalk, it returns with a value of 10000000 which = 10 Mbps

root:~# snmpwalk -v2c -c community sensor ifSpeed

IF-MIB::ifSpeed.1 = Gauge32: 10000000

IF-MIB::ifSpeed.2 = Gauge32: 10000000

IF-MIB::ifSpeed.3 = Gauge32: 10000000

IF-MIB::ifSpeed.4 = Gauge32: 10000000

This is incorrect as the device has gigabit interfaces installed. It is my understanding that some network monitoring programs use this value when calculating bandwidth used.

Why does the interface return the incorrect value?

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