If external connectivity to the
IPFE,
say
IPFE-A1,
fails:
Connections to
IPFE-A1
and TSA1 fail.
IPFE-A2
does not take over TSA1 since it sees
IPFE-A1
as available. That is, internal connections still work.
Clients with failed connections to TSA1 must send
traffic to TSA2.
Clients attempting to create new connections to TSA1
fail.
IPFE-A2
and TSA2 carry all the traffic for all the clients.
When external connectivity is restored:
There are no existing connections for TSA1 to handle.
IPFE-A1
still retains control over TSA1.
Clients route new connections to TSA1 over time.
In the interim, there is a substantial imbalance
between the two
IPFEs
as well as between the servers in the two TSAs. The
IPFEs
monitors the traffic for imbalances and distribute new connections to reduce
the imbalance.
