Forum Discussion
Zen_Y
Altostratus
AltostratusWhat will be happen to live and existing connections when failover HA BIG IP active-standby
Good morning I have a little question, when we create HA configuration with active-standby mode, with Mac Masquerade configuration. What will be happen to live and existing connections? They will be...
akonu
Moderator
ModeratorZen_Y .
To maintain active connections when a failover occurs, you will need to configure connection mirroring.
I found some information that could help answer your questions on our myf5 portal, please click on the links below .
K84303332: Overview of connection and persistence mirroring (13.x - 16.x)
https://my.f5.com/manage/s/article/K84303332
Manual Chapter : Managing Connection Mirroring
https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-device-service-clustering-admin-11-5-0/9.html
On the other hand MAC masquerade optimizes the flow of traffic during failover events
K13502: Configuring MAC masquerade (11.x - 17.x)
https://my.f5.com/manage/s/article/K13502.
I hope this helps.
- Zen_Y
Hi akonu
This is interesting, I have read several articles about mirroring connections, but in the implementation in reality, I have not implemented this. Is there any information about the impact of this implementation? such as increasing cpu, memory, network load or even certain bugs that must be avoided on both active and standby devices?
And when we do not implement a mirroring connection, will the existing connection time out before it finds a new active device?
- Paulius
MVP
This is dependent on how the application handles a no response. I would say from a TCP perspective, the connection would time out, it would inform the user of the connection loss and you would have to refresh the connection or resend the request.
- Zen_Y
doesn't a timeout event occur when a network device doesn't find the appropriate IP and MAC address to send data? while when we do a failover with the same IP vs, IP data, and MAC address recognized by the server side and client side, will they also fail to find a new device without going through the timeout process?
when failover, I once tried to do a ping test, I don't know if this will be relevant to real traffic or not, but there was no timeout status. Doesn't this mean that the network device can receive a new IP and MAC on a previously inactive device, and immediately flow traffic there?
