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STP & Layer 2 Switch redundency 30 June 2008 at 12:17 pm by admin
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Spanning Tree Protocol & Layer 2 Redundency.

Layer 2 redundency improves network availability with alternative network paths.
A simple path can be disrupted with little impact.
Redundency is achieved at the distribution & core through additional hardware & alternate paths.
Each Access Layer switch is connected to 2 different Distribution Layer switches.
Each Distribution Layer switch is connected to 2 Core Layer switches.
Spanning Tree Protocol is enabled by default.
Spanning Tree Protocol puts some ports into forwarding & others in blocking.
This prevents Layer 2 switching loops. Spanning Tree Protocol uses a redundant link if the primary fails.

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Tags: vtp, cisco, switch, router, ip, guides

+ Configuring switch security for cisco catalyst 2950 By admin 18 June 2008 at 5:25 pm and have 1 Comment


Configuring port security

A switch without port security allows attackers to connect to unused, ports and gather info or attack the network. All ports should be secured before a switch is deployed. Port security limits the number of MAC addresses allowed on port.
If you limit the number to 1 & assign a single MAC address only the pc attached is allowed to connect via that port, when that number is reached a security violation occurs.

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