If external connectivity to the IPFE, say IPFE-A1, fails:
- Connections to IPFE-A1 and TSA1 fail.
- IPFE-A2 will 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 will fail.
- IPFE-A2 and TSA2 will carry all the traffic for all the clients.
When external connectivity is restored:
- There will be no existing connections for TSA1 to handle.
- IPFE-A1 will still retain control over TSA1.
- Clients will route new connections to TSA1 over time.
- In the interim, there will be a substantial imbalance between the two IPFEs as well as between the servers in the two TSAs. The IPFEs will monitor the traffic for imbalances and distribute new connections to reduce the imbalance.