BIG-IP HA Timers?

e.g.

 configuration

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.20.111:80
    ip-protocol tcp
    mask 255.255.255.255
    mirror enabled
    pool foo
    profiles {
        http { }
        tcp { }
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 23
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
    }
}

 traffic-group

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) show cm traffic-group

---------------------------------------------------------
CM::Traffic-Group
Name                      Device          Status   Next
                                                   Active
---------------------------------------------------------
traffic-group-1           ve11a.acme.com  active   false
traffic-group-1           ve11b.acme.com  standby  false
traffic-group-1           ve11c.acme.com  standby  true
traffic-group-local-only  -               -        -

 active

[root@ve11a:Active:In Sync] config  tcpdump -nni 0.0 port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 96 bytes
23:03:55.826879 IP 172.28.20.17.34059 > 172.28.20.111.80: S 62319:62319(0) win 5840 
23:03:55.827020 IP 172.28.20.111.80 > 172.28.20.17.34059: S 3947983183:3947983183(0) ack 62320 win 4380 
23:03:55.828778 IP 172.28.20.17.34059 > 172.28.20.111.80: . ack 1 win 5840
23:03:55.828790 IP 172.28.20.17.34059 > 172.28.20.111.80: P 1:157(156) ack 1 win 5840
23:03:55.828886 IP 200.200.200.14.34059 > 200.200.200.101.80: S 4138377900:4138377900(0) win 4380 
23:03:55.828901 IP 172.28.20.111.80 > 172.28.20.17.34059: . ack 157 win 4536
23:03:55.830747 IP 200.200.200.101.80 > 200.200.200.14.34059: S 3675627561:3675627561(0) ack 4138377901 win 5840 
23:03:55.830793 IP 200.200.200.14.34059 > 200.200.200.101.80: . ack 1 win 4380
23:03:55.830806 IP 200.200.200.14.34059 > 200.200.200.101.80: P 1:157(156) ack 1 win 4380
23:03:55.833637 IP 200.200.200.101.80 > 200.200.200.14.34059: . ack 157 win 6432
23:03:55.834892 IP 200.200.200.101.80 > 200.200.200.14.34059: P 1:244(243) ack 157 win 6432
23:03:55.834948 IP 172.28.20.111.80 > 172.28.20.17.34059: P 1:244(243) ack 157 win 4536
23:03:55.834953 IP 200.200.200.14.34059 > 200.200.200.101.80: . ack 244 win 4623
23:03:55.836948 IP 172.28.20.17.34059 > 172.28.20.111.80: . ack 244 win 6432
23:03:55.836964 IP 172.28.20.17.34059 > 172.28.20.111.80: F 157:157(0) ack 244 win 6432
23:03:55.837011 IP 172.28.20.111.80 > 172.28.20.17.34059: . ack 158 win 4536
23:03:55.837018 IP 200.200.200.14.34059 > 200.200.200.101.80: F 157:157(0) ack 244 win 4623
23:03:55.838686 IP 200.200.200.101.80 > 200.200.200.14.34059: F 244:244(0) ack 158 win 6432
23:03:55.838732 IP 200.200.200.14.34059 > 200.200.200.101.80: . ack 245 win 4623
23:03:55.838740 IP 172.28.20.111.80 > 172.28.20.17.34059: F 244:244(0) ack 158 win 4536
23:03:55.840642 IP 172.28.20.17.34059 > 172.28.20.111.80: . ack 245 win 6432

 standby

[root@ve11c:Standby:In Sync] config  tcpdump -nni 0.0 port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 96 bytes
23:03:55.828927 IP 172.28.20.17.34059 > 172.28.20.111.80: S 62319:62319(0) win 5840 
23:03:55.830911 IP 172.28.20.17.34059 > 172.28.20.111.80: . ack 3947983184 win 5840
23:03:55.830940 IP 172.28.20.17.34059 > 172.28.20.111.80: P 0:156(156) ack 1 win 5840
23:03:55.832920 IP 200.200.200.101.80 > 200.200.200.14.34059: S 3675627561:3675627561(0) ack 4138377901 win 5840 
23:03:55.834772 IP 200.200.200.101.80 > 200.200.200.14.34059: . ack 157 win 6432
23:03:55.836860 IP 200.200.200.101.80 > 200.200.200.14.34059: P 1:244(243) ack 157 win 6432
23:03:55.838676 IP 172.28.20.17.34059 > 172.28.20.111.80: . ack 244 win 6432
23:03:55.838698 IP 172.28.20.17.34059 > 172.28.20.111.80: F 156:156(0) ack 244 win 6432
23:03:55.840649 IP 200.200.200.101.80 > 200.200.200.14.34059: F 244:244(0) ack 158 win 6432
23:03:55.842863 IP 172.28.20.17.34059 > 172.28.20.111.80: . ack 245 win 6432