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Bitmindframes Study guides

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

Bitmndframes cisco study guides

DTP Dynamic Trunking Protocol

Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Cisco proprietary Point-to-Point Protocol.
These various modes are configured using the switchport mode interface command
Switch trunk interfaces support different trunking modes.

• Access
• Dynamic desirable (default mode on Catalyst 2950 and 3550)
• Dynamic auto
• Trunk
• Non-negotiate
• dotq-tunnel (Not an option on the Catalyst 2950.)

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Tags: wan, cisco, switch, vtp, 802.1q, ip

Bitmindframes study guides

What is VTP?

VLAN Trunking Protocol (VTP) is a Cisco proprietary Layer 2 messaging protocol that manages the addition, deletion, and renaming of VLANs on a network-wide basis. Virtual Local Area Network (VLAN) Trunk Protocol (VTP) reduces administration in a switched network. When you configure a new VLAN on one VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to configure the same VLAN everywhere. To do this VTP carries VLAN information to all the switches in a VTP domain. VTP advertisements can be sent over ISL, 802.1q, IEEE 802.10 and LANE trunks. VTP traffic is sent over the management VLAN (VLAN1), so all VLAN trunks must be configured to pass VLAN1. VTP is available on most of the Cisco Catalyst Family products.

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Tags: ip, guides, interface, switch, wan, router

Bitmindframes cisco study guides.

TRUNKING
Trunking is Point to point link from a switch to a router or a switch. A trunk link can carry traffic from multiple vlans over a single link allowing vlans to span internetworks.
Cisco supports IEEE 802.1Q trunking on 100/1000 ethernet

What does trunking solve?
Without trunking switches & routers have to be interconnected with a separate link for each VLAN. 4 VLANs require 4 links connecting switches S1 & S2 leaving fewer ports for devices. If S2 was connected to S1 it would be more than 4 ports.

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