Time Sync issue on Application Servers

do you mean tmsh command to show active connection?

e.g.

 bigpipe

[root@ve10:Active] config  b conn client 192.168.206.178 server 172.28.24.9 show all
VIRTUAL 172.28.24.9:80 <-> NODE 200.200.200.101:80   TYPE any   1/0
    CLIENTSIDE 192.168.206.178:63763 <-> 172.28.24.9:80
        (pkts,bits) in = (4, 500)   out = (2, 481)
    SERVERSIDE 200.200.200.15:63763 <-> 200.200.200.101:80
        (pkts,bits) in = (3, 521)   out = (4, 500)
    PROTOCOL 6   UNIT 1   IDLE 2 (300)   LASTHOP external 00:01:e8:d5:d4:47
VIRTUAL 172.28.24.9:80 <-> NODE 200.200.200.101:80   TYPE any   1/0
    CLIENTSIDE 192.168.206.178:63764 <-> 172.28.24.9:80
        (pkts,bits) in = (5, 546)   out = (6, 4534)
    SERVERSIDE 200.200.200.15:63764 <-> 200.200.200.101:80
        (pkts,bits) in = (5, 4494)   out = (5, 546)
    PROTOCOL 6   UNIT 1   IDLE 2 (300)   LASTHOP external 00:01:e8:d5:d4:47

 tmsh

[root@ve10:Active] config  tmsh show sys connection cs-client-addr 192.168.206.178 cs-server-addr 172.28.24.9 all-properties
Sys::Connections
192.168.206.178:63763 - 172.28.24.9:80 - 200.200.200.101:80
-----------------------------------------------------------
  TMM           0
  Type          any
  Protocol      tcp
  Idle Time     4
  Idle Timeout  300
  Unit ID       1
  Lasthop       external 00:01:e8:d5:d4:47
  Virtual Path  172.28.24.9:80

                          ClientSide            ServerSide
  Client Addr  192.168.206.178:63763  200.200.200.15:63763
  Server Addr         172.28.24.9:80    200.200.200.101:80
  Bits In                       4.0K                  4.1K
  Bits Out                      3.8K                  4.0K
  Packets In                       4                     3
  Packets Out                      2                     4

192.168.206.178:63764 - 172.28.24.9:80 - 200.200.200.101:80
-----------------------------------------------------------
  TMM           0
  Type          any
  Protocol      tcp
  Idle Time     4
  Idle Timeout  300
  Unit ID       1
  Lasthop       external 00:01:e8:d5:d4:47
  Virtual Path  172.28.24.9:80

                          ClientSide            ServerSide
  Client Addr  192.168.206.178:63764  200.200.200.15:63764
  Server Addr         172.28.24.9:80    200.200.200.101:80
  Bits In                       4.3K                 35.9K
  Bits Out                     36.2K                  4.3K
  Packets In                       5                     5
  Packets Out                      6                     5

Total records returned: 2

Thanks so much for the answer.. it's pretty close to what I need..

But your second command result is what I'm looking for except it's for a specific source and destination.

I need to track the time taken for each session before it timeout.

is irule and tcl clock command useful? anyway, CLIENT_CLOSED is triggered when connection is closed either by manual or idle timeout.

e.g.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:23
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        mytcp { }
    }
    rules {
        myrule
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 7
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm profile tcp mytcp
ltm profile tcp mytcp {
    app-service none
    defaults-from tcp
    idle-timeout 60
    keep-alive-interval 4294967295
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule myrule
ltm rule myrule {
    when CLIENT_ACCEPTED {
  set start [clock seconds]
}
when CLIENT_CLOSED {
  log local0. "Client=[IP::client_addr]:[TCP::client_port] VS=[IP::local_addr]:[TCP::local_port] Duration=[expr {[clock seconds] - $start}] sec"
}
}

 /var/log/ltm

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Feb 11 00:07:32 ve11a info tmm1[13662]: Rule /Common/myrule : Client=192.168.206.178:57236 VS=172.28.24.10:23 Duration=64 sec

After further investigation, it seems that one of the Application server was out-of-sync by 12-15 seconds..it might be the time sync on OS level issue

On F5, the default timeout is 300 seconds which I see is more than enough for most sessions.

Hi all, currently we are still having the time sync issue for this time-sensitive and we have an idea to use F5 to resolve the issue.

Current setup on F5 is the traffic are on Round Robin Load Balancing Method to both application server.

Proposed Solution is to point the traffic to one application server but we still want to have the other application server as back-up.

Should I use Priority Group putting one of the server as Priority Group 2 and another as Priority Group 1 ? What Load Balancing Method should I use ?