Network Switches & Routers

Oversubscription

Forwarding engine

• ●   Default: Centralized forwarding card (CFC)
• ●   Optional: Distributed forwarding card with DFC3A, DFC3B, DFC3BXL, DFC3C, or DFC3CXL

• ●   Receive: 8q8t
• ●   Transmit: 1p7q8t

• ●   Class of service (CoS)–based queue mapping

• ●   Deficit Weighted Round Robin (DWRR)
• ●   Weighted Random Early Detection (WRED)

(Layer 2)

• ●   Ingress and egress
• ●   Approximately 20 GB per replication engine
• ●   2 replication engines per module

(Layer 3)

• ●   Ingress and egress
• ●   Approximately 10 GB per replication engine
• ●   2 replication engines per module

• ●   Any Cisco Catalyst 6500 E-Series chassis, C6509-NEB-A chassis, non-E-Series chassis with fan tray 2, or Cisco 7600 Series or 7600-S Series chassis (NEBS compliant: operating temperature up to 55°C)
• ●   Not supported in Cisco Catalyst 6503 non-E Series chassis

• ●   Can occupy any slot in any Cisco Catalyst 6503-E, 6504-E, 6506, 6506-E, 6509, 6509-E, 6509-V-E, or 6509-NEB-A chassis; or Cisco 7604, 7607, 7609, or 7600-S Series chassis
• ●   Can occupy only slots 9 through 13 in a Cisco Catalyst 6513 or Cisco 7613 chassis