Chapter 3 61 2007 2016 Cisco Systems Inc All rights reserved Cisco Public

Chapter 3 61 2007 2016 cisco systems inc all rights

This preview shows page 61 - 69 out of 87 pages.

Chapter 3 61 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public Overwriting VTP Configuration (Very Common Issue with VTP)
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Chapter 3 62 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public Overwriting VTP Configuration (Very Common Issue with VTP)
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Chapter 3 63 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public VTP Key Points Avoid, as much as possible, VLANs that span the entire network. The VTP revision number is stored in NVRAM and is not reset if you erase the switch configuration and reload it. To reset the VTP revision number to zero, use the following two options: Change the switch’s VTP domain to a nonexistent VTP domain, and then change the domain back to the original name. Change the switch’s VTP mode to transparent and then back to the previous VTP mode.
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Chapter 3 64 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public Best Practices for VTP Implementation VTP is often used in a new network to facilitate the implementation of VLANs. However, as the network grows larger, this benefit can turn into a liability. If a VLAN is deleted by accident on one server, it is deleted throughout the network. If a switch that already has a VLAN database defined is inserted into the network, it can hijack the VLAN database by deleting added VLANs. Because of this, it is the recommended practice to configure all switches to transparent VTP mode and manually add VLANs as needed, especially in a larger campus network. VTP configuration is usually good for small environments.
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Chapter 3 65 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public Implementing EtherChannel in a Switched Network
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Chapter 3 66 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public Implementing EtherChannel in a Switched Network The need for EtherChannel technology Port aggregation negotiation protocols Configuration steps for bundling interfaces into a Layer 2 EtherChannel Configuring EtherChannel Changing EtherChannel load-balancing behavior How EtherChannel load-balancing works The role of EtherChannel Guard
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Chapter 3 67 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public The Need for EtherChannel
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Chapter 3 68 © 2007 – 2016, Cisco Systems, Inc. All rights reserved. Cisco Public EtherChannel Overview EtherChannel is a technology that was originally developed by Cisco as a LAN switchto- switch technique of grouping several Fast or Gigabit Ethernet ports into one logical channel. This technology has many benefits: It relies on the existing switch ports. There is no need to upgrade the switch-to-switch link to a faster and more expensive connection. Most of the configuration tasks can be done on the EtherChannel interface instead of on each individual port, thus ensuring configuration consistency throughout the switch-to-switch links.
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