To reach a high level of availability, you have to focus on these areas: network device reliability, device redundancy, link redundancy, fast convergence, a correct network design, and a well-documented network. There are two general types of redundancy: component and chassis. Component redundancy provides protection against a component failing inside a chassis. Chassis redundancy protects against failure of a device.

In hardware redundancy, if you're going to have dual SEs, they must be in slots 1 and 2. The secondary SE is in a standby state, with the exception of its uplink interfaces, which can be used. RPR provides hardware redundancy for the MSFC and PFC cards. The primary SE uses its own MSFC card, whereas the secondary is in a ...

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