[mrtg] Re: Traffic in interfaces & sub-interfaces

Daniel J McDonald dmcdonald at digicontech.com
Fri Sep 14 21:33:33 MEST 2001

José Maria Costa Pereira queried:
>	In a cisco router, the VLANs configuration shows up like
>sub-interfaces of the FastEthernet0/0, for instance:
>		VLAN 1 - FastEthernet0/0.1
>		VLAN 2 - FastEthernet0/0.2
>		VLAN 3 - FastEthernet0/0.3
>		VLAN 4 - FastEthernet0/0.4
>		(...)
>	If I measure the bits in/out in the interface FastEthernet0/0 is
>this equal to the sum of bits in/out in all the sub-interfaces
>(FastEthernet0/0.1 + FastEthernet0/0.2 + FastEthernet0/0.3 +
>FastEthernet0/0.4 + (...)).

Yes, the instance for the physical port contains bytes for all
sub-interfaces.  This is true for Fast E, and Frame-relay connections as

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