Etherchannel L2 Lacp Configration...Step by step...

EtherChannel L2 LACP Configuration networkingguruji1.com/2020/01/etherchannel-l2-lacp-configuration.html

My Dear Friend in today’s article, I will tell you “EtherChannel L2 LACP Configuration” If you any problem after reading this article, you can see the video below. Please don't forget to Like, Share, Comment & Subscribe to our Networking Guruji Channel for more video.

Previous post: - Layer 2 Etherchannel with pagp, Basic to advance level & Configuration…Click Here Today Dissuasion: - LACP (IEEE802.3ad or Open Standard)

Etherchannel Verification Etherchannel can be configured in two ways, you can configure statically or you can rely on Negotiation protocol, that will do the negotiation and will from port-channel. In the previous example, we have seen how we can configure EtherChannel statically. Now we will see how we can configure EtherChannel with negotiation protocol. In cisco device following two protocols are used for the negotiation.

Pagp ---- Port Aggregation Protocol (Cisco Proprietary) Lacp ---- Link Aggregation Protocol (IEEE 802.3ad or open standard) Etherchannel Modes in Switches: Mode On 1/7

Negotiation Protocol None Explanation Enable Etherchannel unconditionally. Recommended if the workstation/server does not support any negotiation protocols.

Mode Off Negotiation Protocol None Explanation Disable Etherchannel unconditionally.

Mode Active Negotiation Protocol LACP Explanation Initiates negotiation by sending LACP packets. Recommended if the workstation/server support LACP. Mode Passive Negotiation Protocol LACP Explanation 2/7

If remote end sends LACP packets, negotiation will start.

Mode Desirable Negotiation Protocol Pagp Explanation Initiates negotiation by sending pagp packets. Recommended if the workstation/server support pagp.

Mode Auto Negotiation Protocol Pagp Explanation If removed end sends pagp packets, negotiation will start.

In this section, we are using Etherchannel negotiation protocol pagp, which is cisco property and modes are desirable and auto.

CCNA Etherchannel LACP Configuration Configure SW-4 port fa0/1 and fa0/5 with dynamic desirable mode.

Configure SW-2 port fa0/1 and fa0/3 with dynamic auto mode.

Configure EtherChannel to use lacp on SW-2 and SW-4 using port fa0/1 and fa0/5 The port-channel number should be 1 SW-4 should imitate the negotiation and sw-2 should respond.

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CCNA Interview Questions and Answers in 2020…. Basic to advance level…Click Here What is a Virtual Local Area Network (VLAN)… Basic to advance level…Click Here

Etherchannel Lacp Configuration SW-2 SW-2(config)#interface fastethernet0/1 SW-2(config-if)#no channel-group 42 mode auto SW-2(config)#interface fastethernet0/3 SW-2(config-if)#no channel-group 42 mode auto SW-2(config-if)#no interface port-channel 42 SW-4 SW-4(config)#interface fastethernet0/1 SW-4(config-if)#no channel-group 42 mode desirable SW-4(config)#interface fastethernet0/5 4/7

SW-4(config-if)#no channel-group 42 mode desirable SW-4(config-if)#no interface port-channel 42 SW-2 SW-2(config)#interface fastethernet0/1 SW-2(config-if)#channel-group 1 mode passive SW-2(config)#interface fastetehrnet0/3 SW-2(config-if)#channel-group 1 mode passive SW-4 SW-4(config)#interface fastethernet0/1 SW-4(config-if)#channel-group 1 mode active SW-4(config)#interface fastetehrnet0/5 SW-4(config-if)#channel-group 1 mode active Note: - We are using Etherchannel negotiation protocol LACP, which is open standard and modes are active and passive.

SW-4# show EtherChannel summary Flags: D – down p – bundled in port-channel I – stand-alone s – suspended H – Hot standby (LACP) only R – layer 3 S – later 2 U – in Use F – Failed to allocate aggregator M – not in use, minimum links not met U – Unsuitable for building W- waiting to be aggregated D – default port Number of channel-groups in use: 1 Number of aggregators: 1

Group 1

port-channel po1(Su)

Protocol ports lacp fa0/1(P)

fa0/5(P)

SW-2# show EtherChannel summary Flags: D – down I – stand-alone

p – bundled in port-channel s – suspended 5/7

H – Hot standby (LACP) only R – layer 3 S – later 2 U – in Use F – Failed to allocate aggregator M – not in use, minimum links not met U – Unsuitable for building W- waiting to be aggregated D – default port Number of channel-groups in use: 1 Number of aggregators: 1

Group 1

port-channel po1(Su)

Protocol ports lacp fa0/1(P)

fa0/3(P)

Sw-4# Show interface trunk Port Po24

Mode Encapsulation desirable n-isl

Port Po24

VLAN allowed on trunk 1-1005

Status trunking

Native VLAN 1

Port Po24

VLANs allowed and active in management domain 1,10,20,30

Port Po24

VLANs in spanning tree forwarding state and not puned 1,10,20,30 6/7

Sw-2# Show interface trunk Port Po24 Port Po24

Mode auto

Encapsulation status n-isl trunking

Native vlan 1

VLAN allowed on trunk 1-1005

Port Po24

VLANs allowed and active in management domain 1,10,20,30

Port Po24

VLANs in spanning tree forwarding state and not puned 1,10,20,30

“EtherChannel L2 LACP” On the above output, since SW-4-member interface (physical interface) were in dynamic desirable mode, newly created the port-channel interface copy the attribute and start negotiating with other ends of the switch, which is SW-2. And Sw-2 members interface (physical interfaces) were configured in dynamic auto mode, created port-channel interface copy this attribute and respond to the negotiation, as result portchannel interface has become trunk.

Note:- “EtherChannel LACP” Channel-group number may not be the same on the switches, it can be different. It is basically logically significant.

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