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Nexus & 6500


The Catalyst 6500 is a modular chassis network switch manufactured by Cisco Systems since 1999, capable of delivering speeds of up to "400 million packets per second".[1] A 6500 comprises a chassis, power supplies, one or two supervisors, line cards and service modules. A chassis can have 3, 4, 6, 9 or 13 slots each (Catalyst model 6503, 6504, 6506, 6509, or 6513, respectively) with the option of one or two modular power supplies. The supervisor engine provides centralised forwarding information and processing; up to two of these cards can be installed in a chasis to provide active/standby or stateful failover. The line cards provide port connectivity and service modules to allow for devices such as firewalls to be integrated within the switch.

Valid CCNA or any CCIE Certification can act as a pre-requisite.
Track Regular Track

Weekend (sat and sun)

Duration 1 month(2 hours a day) 7 Weekends(4 hours a day)
Training Fee 20,000/-          20,000/-

Additionl Benefits

Operating systems

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


CatOS is supported for layer 2 (switching) operations only. To be able to perform routing functions (e.g. Layer 3) operations, the switch must be run in hybrid mode. In this case, CatOS runs on the Switch Processor (SP) portion of the Supervisor, and IOS runs on the Route Processor (RP) also known as the MSFC. To make configuration changes, the user must then manually switch between the two environments. While CatOS does have some functionality missing,[2] it's generally considered obsolete compared to running a switch in Native Mode.

Native IOS

Cisco IOS can be run on both the SP and RP. 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. This mode is the default shipping mode for Cisco products and enjoys support of all new features and line cards.

Modular IOS

Modular IOS is a version of Cisco IOS that employs a modern UNIX-based kernel to overcome some of the limitations of IOS.[3] Additional to this is the ability to perform patching of processes without rebooting the device and in service upgrades.

Online Insertion & Removal

OIR is a feature of the 6500 allowing hot swapping most line cards without first powering down the chassis. The advantage of this is that one may perform an in-service upgrade. However, before attempting this, it is important to understand the process of OIR and how it may still require a reload. To prevent bus errors, the chassis has three pins in each slot which correspond with the line card. Upon insertion, the longest of these makes first contact and stalls the bus (to avoid corruption). As the line card is pushed in further, the middle pin makes the data connection. Finally, the shortest pin removes the bus stall and allows the chassis to continue operation.

However, if any part of this operation is skipped, errors will occur (resulting in a stalled bus and ultimately a chassis reload). Common problems include:
  • Line cards being inserted incorrectly (and thus making contact with only the stall and data pins and thus not releasing the bus)
  • Line cards being inserted too quickly (and thus the stall removal signal is not received)
  • Line cards being inserted too slowly (and thus the bus is stalled for too long and forces a reload)
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