Chapter 3 Link Aggregation Scaling Networks PresentationID 2008

Chapter 3: Link Aggregation Scaling Networks Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 1

Chapter 3 3. 1 Link Aggregation Concepts 3. 2 Link Aggregation Configuration 3. 3 Summary Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2

Chapter 3: Objectives § Explain the operation of link aggregation in a switched LAN environment. § Describe Ether. Channel technology. § Configure link aggregation to improve performance on high-traffic switch links. § Configure link aggregation with Ether. Channel. § Verify and troubleshoot link aggregation with Ether. Channel. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3

3. 1 Link Aggregation Concepts Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4

Link Aggregation Introduction to Link Aggregation § Link aggregation allows the creation of logical links made up of several physical links. § Ether. Channel is a form of link aggregation used in switched networks. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5

Link Aggregation Advantages of Ether. Channel § Most configurations are done on the Ether. Channel interface ensuring consistency throughout links. § Relies on existing switch ports – no need for upgrades. § Load-balances between links on the same Ether. Channnel. § Creates an aggregation viewed as one logical link by STP. § Provides redundancy because the overall link is viewed as one logical connection. If one physical link within channel goes down, this does not cause a change in the topology and does not require STP recalculation. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6

Ether. Channel Operation Implementation Restrictions § Ether. Channel implemented by grouping multiple physical ports into one or more logical Ether. Channel links. § Interface types cannot be mixed. § Ether. Channel provides full-duplex bandwidth up to 800 Mb/s (Fast Ether. Channel) or 8 Gb/s (Gigabit Ether. Channel). § Ether. Channel can consist of up to 16 compatibly-configured Ethernet ports. § The Cisco IOS switch currently supports six Ether. Channels. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7

Ether. Channel Operation Port Aggregation Protocol (PAg. P) Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8

Ether. Channel Operation Link Aggregation Control Protocol (LACP) Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9

3. 2 Link Aggregation Configuration Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10

Configuring Ether. Channel Configuration Guidelines § Ether. Channel must be supported. § Speed and duplex must match. § VLAN match – All interfaces are in the same VLAN. § Range of VLAN – Same range on all interfaces. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11

Configuring Ether. Channel Configuring Interfaces Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12

Verifying and Troubleshooting Ether. Channel Verifying Ether. Channel § show interface Port-channel – Displays the general status of the Ether. Channel interface. § show etherchannel summary – Displays one line of information per port channel. § show etherchannel port-channel – Displays information about a specific port channel interface. § show interfaces etherchannel – Provides information about the role of the interface in the Ether. Channel. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13

Verifying and Troubleshooting Ether. Channel Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 14

Chapter 3: Summary This chapter described: § Ether. Channel and how to encompass both the PAg. P-based and the LACP-based link aggregation methods § Ether. Channel technologies and the various means available to implement them § The configuration, verification, and troubleshooting of Ether. Channel Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 15

Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 16