Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 32)

White Paper

Figure 19. CiscoView w ith Active and Standby Sw itch Views

High Availability

Central to the high-availability model of a Cisco Virtual Switching System are the concepts of NSF/SSO and RPR.

The intricacies of these protocols are beyond the scope of this paper; you can find more information on these

protocols in the Cisco Catalyst 6500 documentation materials as well as in the following white paper:

Nonstop Forwarding and Stateful Switchover on the Cisco Catalyst 6500

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd801c5cd7.html

The high-availability model of the system changes when you integrate two chassis together into a single network

entity. In order to take advantage of the existing innovations in NSF/SSO technologies, Cisco Virtual Switching

System has implemented a high-availability model that uses this redundancy framework for an inter-chassis

environment (Figure 20).

Figure 20. Interchassis NSF/SSO in a Cisco Virtual Sw itching System Environment

In an SSO system, “high availability-aware” protocols and features may synchronize events and state information

from the active supervisor engine to the hot-standby supervisor engine. From a redundancy framework viewpoint, the

active supervisor engine acts as a server, whereas the standby supervisor engine acts as the client. Information that

is “high availability-aware” will be statefully synchronized between these entities such that in the event of a failover,

the standby supervisor engine does not need to re-learn this information, resulting in a minimal amount of outage

time.

As Figure 19 shows, the supervisor engine in the active virtual switch (switch 1 in the figure) assumes the role as the

active supervisor engine, whereas the supervisor engine in the standby virtual switch (switch 2) assumes the role as

the hot-standby supervisor engine. You can verify this situation with the following command:

VSS#sh switch virtual redundancy

My Switch Id = 1

Peer Switch Id = 2

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Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario Pagina 32