Updating ios on 6506 sup720

It provides 80 gigabits per slot on all slots of 6500-E chassis.

The 6500 currently supports three operating systems: Cat OS, Native IOS and Modular IOS.

The supervisor then looks up the correct egress port, access lists, policing and any relevant rewrite information on the PFC.

This is placed on the result bus (r Bus) and sent to all line cards.

They are looked up in the PFC (including ACLs etc.) and then the result is placed on the r Bus.

The initial egress line card takes this information and forwards the data to the correct line card along the switch fabric.

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Unlike the previous examples, the line cards hold a full copy of the supervisor's routing tables locally, as well as its own L2 adjacency table (i.e. This eliminates the need for any connection to the classic bus or requirement to use the shared resource of the supervisor.

The 6500 Supervisor comprises a Multilayer Switch Feature Card (MSFC) and a Policy Feature Card (PFC).

The MSFC runs all software processes, such as routing protocols. The supervisor has connections to the switching fabric and classic bus, as well as bootflash for the Cisco IOS software.

To make configuration changes, the user must then manually switch between the two environments.

Cat OS does have some functionality missing and is generally considered 'obsolete' compared to running a switch in Native Mode. In this instance, the user is unaware of where a command is being executed on the switch, even though technically two IOS images are loaded—one on each processor.

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