High Availability for JNCIS-SP
High Availability 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. Link Aggregation Groups (LAG / LACP) LAG bundles multiple physical interfaces into a single logical ae (aggregated Ethernet) interface, providing both redundancy and increased bandwidth. IEEE standard 802.3ad — not to be confused with 802.1ad (Q-in-Q). ...