[ixpmanager] Discrepancies between sflow hosts

[Will Hargrave]

On 20 Feb 2021, at 11:39, Ian Chilton wrote:

>> sflow-to-rrd-handler needs an accurate mapping of what MAC addresses 
>> are assigned to what port (and consequently which ixp participant).
> Yep…. but are you able to give a bit more background on why?
> It uses the MAC to know the src and dest so it can build the P2P 
> graphs?
> Hopefully this isn’t a stupid question, but why can’t it use srcip 
> & dstip which are more assigned and therefore more definitive?

Remember this is data plane not control plane traffic - it’s random 
user packets - so the src/dst IP can be anything on the Internet! The 
only way to know the source/destination interface is to look up which 
port a mac address is seen on - then you can build p2p graphs from that.


Will