CCNA link aggregation
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The document discusses link aggregation, which combines multiple network connections to increase throughput beyond a single connection and provide redundancy if one link fails. It defines etherchannel as a form of link aggregation that uses either the Cisco proprietary PAgP protocol or the IEEE standard LACP protocol to negotiate the aggregated link. The benefits of link aggregation are outlined as configuring one logical port channel interface instead of multiple links, single STP calculation, load balancing between links, and the ability to achieve bandwidths over 8Gbps. Steps for configuring etherchannel are provided, including ensuring matching settings on ports and choosing the appropriate channel mode.
CCNA link aggregation
- 1. Copyright © www.networkel.com 3- Link Aggregation 3.1 Link Aggregation Overview 3.2 Link Aggregation Configuration
- 2. Copyright © www.networkel.com 3.1 Link Aggregation Overview
- 3. Copyright © www.networkel.com LINKAGGREGATIONBASICS • Combining (aggregating) multiple network connections in parallel in order to increase throughput beyond what a single connection could sustain, and to provide redundancy in case one of the links should fail • Etherchannel is a form of LAG • Interface types must be same on both sides SW1 SW2 SW1 SW2 Four 1 Gbps Links (Physical Interface) One 4 Gbps Etherchannel Link Gig 1/0/1 Gig 1/0/2 Gig 1/0/3 Gig 1/0/4 Po1
- 4. Copyright © www.networkel.com BONUSSLIDE( PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)
- 5. Copyright © www.networkel.com LINKAGGREGATIONBENEFITS • Configure just a Po (Port Channel) interface instead of configuring 4 seperate links • One logical link for STP (i.e. If gig1/0/1 is down, STP recalculation is not made again • Load-balancing • Up to 8Gbps BW SW1 SW2 SW1 SW2 Four 1 Gbps Links (Physical Interface) One 4 Gbps Etherchannel Link Gig 1/0/1 Gig 1/0/2 Gig 1/0/3 Gig 1/0/4 Po1
- 6. Copyright © www.networkel.com PAGP • Cisco Systems proprietary networking protocol, which is used for etherchannel • Can be configured to operate in three different modes : Auto : Passive negotiation of the channel Desirable : Active negotiation of the channel On : No protocols are used, it assumes the other side has enabled link aggregation Channel Mode Auto Desirable On Auto NO YES NO Desirable YES YES NO On NO NO YES
- 7. Copyright © www.networkel.com LACP • IEEE specification which is used for creating etherchannel • Can be configured to operate in three different modes : On : Channel member without protocol Active : Enables LACP unconditionally Passive : Enables LACP only when an LACP device is detected Channel Mode On Active Passive On YES NO NO Active NO YES YES Passive NO YES NO
- 8. Copyright © www.networkel.com 3.1 Link Aggregation Configuration
- 9. Copyright © www.networkel.com ETHERCHANNELCONFIGURATIONSTEPS • Check If your chassis supports etherchanel • Make sure that ; Duplex modes Port speeds VLANs match on ports at both sides • Choose the right channel mode SW1 SW2 Gig 1/0/1 Full Duplex VLAN 20 Gig 1/0/2 Full Duplex VLAN 20 Gig 1/0/3 Full Duplex VLAN 20 Gig 1/0/4 Full Duplex VLAN 20
- 10. Copyright © www.networkel.com ETHERCHANNELCONFIGURATION SW1 SW2 Fa0/1 Fa0/1 Fa0/2 Fa0/2
- 11. Copyright © www.networkel.com VERIFYINGETHERCHANNELCONFIGURATION SW1 SW1 SW2 Fa0/1 Fa0/1 Fa0/2 Fa0/2
- 12. Copyright © www.networkel.com BONUSSLIDE( PROMOTIONOFFER!) • To get our CCNA 200-125 Full Video Training with %90 discount click the link below now ! CCNA 200-125 VIDEO TRAINING (GET WITH %90 DISCOUNT)