Forum Discussion

Shiraz's avatar
Shiraz
Icon for Altostratus rankAltostratus
Jan 13, 2017

Connection Mirroring with connections showing on Standby

Hi All,

 

I have connection mirroring and persistence mirroring enabled on the vCMP guest (5250V series). I have the connections for Virtual Servers showing on the standby unit as well for all the new connections. When I took the packet capture on standby, I see that there are packets flowing IN F5 standby (Only IN Packets) .

 

SO, Is this normal behavior to see the packets and connections on VS Statistics when we have connection mirroring.

 

Regards,

 

Mohammed

 

application delivery
BIG-IP
connection mirroring
connections on standby
ha pair
security
TMOS
traffic on standby
  • Hannes_Rapp's avatar
    Hannes_Rapp
    Icon for Nimbostratus rankNimbostratus
    Jan 13, 2017

    Yes, that's completely normal. This information is kept in the table to make the Standby unit a "hot spare". In an event of a fail over, your Standby Unit is ready to resume existing stateful connections mid-stream. Without connection mirroring, your BigIP would respond to any alien TCP/ACK or TCP/PSH packets with a TCP/RST packet.

     

    Note that in case of HTTP-based services or other protocols that have built-in retry mechanism in L7, the connection mirroring feature is unlikely to add any value.