Cisco CCNP Security · SCOR + SNCF · SNCF 1.4 · SCOR 2.1 · High availability

Firewall high availability: active/standby failover, stateful failover and clustering

Why production firewalls come in pairs. Build an ASA active/standby pair with a stateful link, watch the configuration and the connection table replicate, kill the active unit while an SSH session stays up, trigger failover from a dead interface, and fix a pair that never forms.

77 min read13 chapters4 labs15 quiz8 scenarios15 interview Q&A

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Inside this module

  • Lab · Build an active/standby pair with stateful failover
  • Lab · Failover drill: kill the active unit, keep the session
  • Lab · Ticket: the new secondary never joins the pair
  • Lab · A dead inside link triggers failover (and failing back)
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