https://ttl-expired.net/tags/high-availability/ Recent content in High-Availability on TTL Expired Hugo en-us Wed, 15 Apr 2026 00:00:00 +0000 https://ttl-expired.net/docs/high_availability/ Wed, 15 Apr 2026 00:00:00 +0000 https://ttl-expired.net/docs/high_availability/ <h2 id="high-availability">High Availability</h2> <p>Junos provides a layered HA architecture. Link aggregation handles physical link redundancy. Graceful Restart, GRES, and NSR handle control plane failures at increasing levels of sophistication. BFD accelerates failure detection for all routing protocols. Understanding which technology does what — and what each one requires — is the core exam objective for this topic.</p> <hr> <h3 id="link-aggregation-groups-lag--lacp">Link Aggregation Groups (LAG / LACP)</h3> <p>LAG bundles multiple physical interfaces into a single logical <code>ae</code> (aggregated Ethernet) interface, providing both redundancy and increased bandwidth. IEEE standard <strong>802.3ad</strong> — not to be confused with 802.1ad (Q-in-Q).</p>