we have a switch core aruba 2930F and we have 3 VLAN, I analyse the traffic of network and we have a mirror port for this process, I conect a machinge whit wireshark and in the analysis we have a lost of pachet.
is there any way to know why i have this packet loss.
it is not really a packet loss... but a retry packet
how do you have configure the packet mirror ?
yes, it is a packet retransmission and TCP out of order.
This is the configuration of mirror port
switch(config)# mirror 1 port 11
switch(config)# interface VLAN 1 monitor all both mirror 1switch(config)# mirror 2 port 11switch(config)# interface VLAN 2 monitor all both mirror 2switch(config)# mirror 3 port 11switch(config)# interface VLAN 3 monitor all both mirror 3
@AntonioSanchez wrote: yes, it is a packet retransmission and TCP out of order.
Technically speaking they (packets retransmission, TCP out-of-order) could happen on mirror port (in particular load/switch conditions from what I understood).
I recall I recently have read an old paper (2007 with HP ProCurve 2824 versus a Cisco Catalyst 2950) about this issues, it's Traffic Trace Artifacts due to Monitoring Via Port Mirroring. It was quite old but it's a quite interesting read also these days.
Edit: If I were the OP I would change/correct/adapt the Thread's title with something like "Aruba 2930R: mirror port and packets re-transmission/out-of-order" since there isn't specifically any packet loss.
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