Cisco WS-C4506 - Syst. Catalyst 4500 Switch Manual de usuario descargar pdf (Pagina 36)

BRKARC-3445

Supervisor 6-E Unicast Packet Walk

1. Packet enters the PHY in the line module and travels across

the backplane before reaching the Supervisor

2. Packet enters the Supervisor; Packet Processor performs parsing of

VLAN tag / header and stores the packet into Packet Memory

3. The stripped header is used to construct a Packet Lookup

Descriptor (PLD) and forwarded to the Forwarding engine

4. PLD goes through L2 lookup. Spanning Tree state is checked. Packet MAC source and MAC

destination coupled with the receive VLAN ID are looked up in the L2 Hash Table. L2 Lookup

also determines whether the packet is destined for Router functionality

5. Input Classification is used to store input ACL and QoS rules in TCAM4

6. Packet is sent to the Forwarding Lookup CAM for L3 lookup. FLC stores L3

forwarding and unicast RPF check rules. Contains IPv4 and IPv6 FIB entries

7. Output Classification stores output ACL and QoS rules in TCAM4

8. The Packet Transmit Descriptor (PTD) is sent to the Queue Memory

9. PTD is sent back to the Packet processor

10. Packet processor transmits the packet across the backplane to the correct egress interface

SUP6L-E shares the same architecture

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Cisco WS-C4506 - Syst. Catalyst 4500 Switch Manual de usuario Pagina 36