Cisco Cisco 1700 2600 3600 3700 Series VPN Module 백서

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Management (Simple Network Management Protocol [SNMP], Telnet, Secure Shell [SSH] Protocol, etc.)

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Layer 2 Protocols (bridge protocol data units [BPDUs], protocol data units [PDUs], Link Aggregation Control

Protocol [LACP], etc.)

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Layer 3 Protocols (routing protocols, etc.)

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Software data path

The supervisor engine on the active virtual switch is also responsible for programming the hardware forwarding

information onto all the distributed forwarding cards (DFCs) across the entire Cisco Virtual Switching System. It

also programs the policy feature card (PFC) on the standby virtual switch supervisor engine.

Figure 2. Components of Cisco Virtual Switching System

From data-plane and traffic-forwarding perspectives, both switches in the Cisco Catalyst 6500 Series Virtual

Switching System actively forward traffic. The Policy Feature Card (PFC) on the active virtual switch supervisor

engine performs central forwarding lookups for all traffic that ingresses the active virtual switch. The PFC on the

standby virtual switch supervisor engine performs central forwarding lookups for all traffic that ingresses the

standby virtual switch. Additionally, all Distributed Forwarding Cards, DFCs across the entire Cisco Virtual

Switching System can also simultaneously perform packet lookups.

Centralized Management

The fundamental design of a Cisco Catalyst 6500 Series Virtual Switching System allows the centralized

management of all network and device resources. This includes Layer 3 protocols, such as Open Shortest Path

First [OSPF], Enhanced Interior Gateway Routing Protocol [EIGRP], Border Gateway Protocol [BGP], etc.), as well

as Layer 2 protocols (Spanning Tree Protocol, Unidirectional Link Detection Protocol [UDLD], Flow Control, LACP,

etc.). A single supervisor engine in the Cisco Virtual Switching System is elected as the central management point

for the entire system.

The chassis containing the supervisor engine acting as the single management point is referred to as the active

virtual switch. The peer chassis is referred to as the standby virtual switch. The single supervisor engine acting as

the single management point is referred to as the active supervisor engine, and the peer supervisor engine in the

standby virtual switch chassis is referred to as the hot-standby supervisor engine. You can verify this setup with the

following commands:

vss#show switch virtual

Switch mode: Virtual Switch

Virtual switch domain number: 200

Local switch number: 1