5. M担 h狸nh m畉ng 畉m b畉o ho畉t 畛ng li棚n t畛c OPERATING SYSTEM HARDWARE Passive Backplane Redundant Management Switch fabrics Hot Swappable I/O Modules N+1 Power Supplies Redundant Controller boards Hot Swappable Fan modules ECC Memory Point to Point (Hub & Spoke) Link Aggregation (802.3ad) Ring EAPS RFC3619 Full Mesh OSPF Layer 3 or Spanning Tree, 802.3ad Dual-Homed VRRP Layer 3 ESRP (Layer 2 & 3) Modularity = Availability Without modularity Reboot if process failure With modularity Self-healing process restart Dynamic software uploads ExtremeXOS: shipping since December 2003 NETWORK