THE SCHOOL OF CISCO NETWORKING (SCN): ETHERCHANNEL NEGOTIATION PROTOCOLS - PAgP (Port Aggregation Protocol) VS LACP (Link Aggregation Control Protocol):
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ETHERCHANNEL NEGOTIATION PROTOCOLS - PAgP (Port Aggregation Protocol) VS LACP (Link Aggregation Control Protocol):

DIFFERENCES BETWEEN PAgP VS LACP COMPARISON:

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An ETHERCHANNEL



ETHERCHANNEL:

An Ether-Channel Is An Extremely Common Technology Used In The Real World To Provide Redundancy And Port Aggregation. Ether-channel Is A Link Aggregation Technology Used On Switches To Group Several Physical Links Into One Logical Link, This Logical Link Is Used To Provide Fault-tolerance.

Ether-channel Technology Provides Automatic Recovery For The Loss Of A Link By Redistributing The Load Across The Remaining Links, Which Is Used To Combine Several Physical Links Between Switches Or Routers Into One Logical Connection And Treat Them As A Single Link. It Can Increase The Bandwidth To A Single Server.

An Etherchannel Bundles Individual Ethernet Links Into A Single Logical Link That Provides The Aggregate Bandwidth Of Up To Eight Physical Links, Can Be Created From Between Two And Eight Active Fast, Gigabit Or 10-Gigabit Ethernet Ports, With An Additional One To Eight Inactive (Failover) Ports Which Become Active As The Other Active Ports Fail. Etherchannel Is Primarily Used In The Backbone Network, But Can Also Be Used To Connect End User Machines.

An Etherchannel Technology Was Invented By Kalpana In The Early 1990s. They Were Later Acquired By Cisco Systems In 1994. In 2000 The IEEE Passed 802.3ad Which Is An Open Standard Version Of Etherchannel.

Using An Etherchannel Has Numerous Advantages, And Probably The Most Desirable Aspect Is The Bandwidth. Using The Maximum Of 8 Active Ports A Total Bandwidth Of 800 Mbit/S, 8 Gbit/S Or 80 Gbit/S Is Possible Depending On Port Speed. The Etherchannel Provides Full-Duplex Bandwidth Up To 800 Mbps (Fast Etherchannel) Or 2 Gbps (Gigabit Etherchannel) Between Your Switch And Another Switch Or Host.


REQUIREMENTS WHEN CONFIGURING ETHERCHANNEL


THE FOLLOWING REQUIREMENTS WHEN CONFIGURING ETHERCHANNEL:


◙ - ➤  All Ports In The Etherchannel Must Be Configured To Operate At The Same Speed And In The Same Duplex Mode.
◙ - ➤  If An Interface In The Bundle Gets Shut Down, The Switch Treats It As A Link Failure. With A Link Failure, Traffic Will Traverse Other Links In The Etherchannel.
◙ - ➤  An Etherchannel Will Not Form If One Of The Interfaces Is A SPAN Destination Port.
◙ - ➤  If This Is To Be A Layer 3 Etherchannel, Then The Layer 3 Addresses Must Be Configured On The Port-Channel Logical Interface, Not To The Physical Interfaces In The Channel.
◙ - ➤  All Ports In The Etherchannel Bundle Must Be Assigned To The Same VLAN Or Be Configured As A Trunk.
◙ - ➤  An Etherchannel Must Have The Same Allowed Range Of Vlans On All The Interfaces In A Trunked Layer 2 Etherchannel. If The Allowed Range Of Vlans Is Not The Same, The Interfaces Do Not Form An Etherchannel.
◙ - ➤  For Layer 2 Etherchannel Bundles, Either Assign All Interfaces In The Etherchannel To The Same VLAN Or Configure Them As Trunks.

◙ - ➤  For More About - >An ETHERCHANNEL:


LAYER 2 ETHERCHANNELS VS LAYER 3 ETHERCHANNELS


LAYER 2 ETHERCHANNELS VS LAYER 3 ETHERCHANNELS:

An Ether Channels Can Be Created As Layer 2 Or Layer3. The Obvious Difference Between Layers 2. Layer 3 Link Will Have A IP Address Associated And Hence Traffic Can Be Routed Between The 2 Switches. A Layer 2 Ether Channel Will Not Have IP Addresses Attached And All Traffic Will Be Switched Between The 2 Devices.

◙ - ➤  LAYER 2 ETHERCHANNELS: Layer 2 Etherchannel Are Normally Used Only When Connecting From An Access Layer Switch. All Interfaces In Each Etherchannel Must Be The Same Speed, And All Must Be Configured As Layer 2 Interfaces.

◙ - ➤  LAYER 3 ETHERCHANNELS: Just As With Physical Interfaces On Multilayer Switches, Bundles Of Interfaces (Port Channels) Can Be Configured As Routed Ports. Port Channels Configured As Routed Ports Are Called L3 Etherchannels.

CONFIGURING LAYER 3 ETHERCHANNELS:

  Step 1: Create A Virtual Layer 2 Interface. - > Switch(config)# Interface Port-Channel 1

  Step 2: Convert to a Layer 3 interface to enable IP configuration. - > Switch(config-if)# No Switchport

  Step 3: Assign an IP address to the port-channel interface: - > Switch(config-if)# IP address IP_Address Subnet_Mask

  Step 4: Navigate To The Interfaces That Are To Be Associated With The Etherchannel Bundle: - > Switch(config)# Interface Range Interface_ID Portnumber_Range

  Step 5: For a Layer 3 EtherChannel to form, the associated physical ports must be configured as Layer 3 ports. Assign the interfaces to the EtherChannel group:

Switch(Config-If-Range# No Switchport
Switch(Config-If-Range)# Channel-Group Channel-Group-Number Mode {Auto [Non-Silent] | Desirable [Non-Silent] | On} | {Active | Passive}


Layer 3 Etherchannel


ETHERCHANNEL NEGOTIATION PROTOCOLS


THERE ARE TWO PROTOCOLS USED FOR NEGOTIATING ETHERCHANNEL PORT AGGREGATION PROTOCOL (PAgP) And LINK AGGREGATION PROTOCOL (LACP). We Can Configure An Etherchannel In THREE Ways In CISCO SWITCHES:

  1. PORT AGGREGATION PROTOCOL (PAgP) - > Cisco Proprietary Protocol.
  2. IEEE LINK AGGREGATION PROTOCOL (LACP) - > Industry Standard.
  3. MANUAL ETHERCHANNEL CONFIGURATION - > Without Using Any Negotiation Protocol Listed Above.

Manually Configured Etherchannel Ports Do Not Exch Ange Etherchannel Protocol Packets. A Manually Configured Etherchannel Forms Only When You ConfIgure All Ports In The Etherchannel Compatibly.


Etherchannel Is Capable Of Using Two Different Protocols To Negotiate Links Between Switches. These Protocols At PAgP (Port Aggregation Protocol) And LACP (Link Aggregation Control Protocol).

Link Aggregation Control Protocol (LACP), Which Is Based On The IEEE 802.3ad Standard. The Port Aggregation Protocol (PAgP), A Cisco-Proprietary Protocol That Can Be Run Only On Cisco Switches And On Switches Released By Licensed Vendors. So If You Have A Non-Cisco Switch And You Want To Run Etherchannel From It, You Have To Either Run LACP Or Set It To On.


◙ - ➤  PORT AGGREGATION PROTOCOL (PAgP): Is A Cisco Proprietary Protocol Used To Automate The Logical Aggregation Of Ethernet Switch Ports. This Means PAgP Can Only Be Used Between Cisco Switches.

◙ - ➤  LINK AGGREGATION CONTROL PROTOCOL (LACP): Is An Industry Standard Protocol Designed To Automate The Logical Aggregation Ethernet Ports. Also Know By Its IEEE Designation 802.3ad LACP Is Not Tied To Any Specific Vendor.

Port Aggregation Protocol (PAgP) Or Link Aggregation Control Protocol (LACP) Is Used By A Switch To Learn The Identity Of Partners, Capability Of Partners And The Interface Properties And Capabilities. Port Aggregation Protocol (PAgP) Or Link Aggregation Control Protocol (LACP) Groups Similarly Configured Interfaces Into A Single Logical Link Present The Group To Spanning Tree Protocol (STP) As A Single Switch Port.


PAgP VS LACP COMPARISON


PORT AGGREGATION PROTOCOL (PAgP):

  Cisco Proprietary.
  Forms Etherchannel Only If Ports Are Configured For Identical Static VLANs Or Trunking.
  Will Automatically Modify Interface Parameters On All Ports Of The Bundle If The Etherchannel Interface Is Changed.
  STP Sends Packets Over Only One Physical Link In A PAgP Bundle. Because STP’s Algorithm Uses The Lowest Port Priority (Priority + Port ID), If Defaults Are Set, STP Will Always Use The Lowest Number Port For BPDUs.

Port Aggregation Refers To The Process Of Bonding Two Or More Ethernet Ports Together To Create A Single Virtual Network Interface. All Ports Bonded Together Using Port Aggregation Are Given The Same Media Access Control (MAC) Address, And They Therefore Are Treated By Remote Servers As A Single Port. Setting Up Port Aggregation Requires Configuration On Both The Server Side And The Switch Side.

THERE ARE TWO PRIMARY REASONS FOR USING PORT BONDING:

  It Increases The Link Throughput Beyond The Throughput Capable By Any Single Port.
  It Provides Redundancy In Case Any Single Port Fails.

Cisco Chooses PAgP By Default. PAgP Packets Are Sent Between Switches On Etherchannel-Capable Ports. These Packets Are Used To Negotiate The Forming Of A Channel. When PAgP Finds Ethernet Links That Match All Their Settings, It Groups Or Bundles The Links Into An Etherchannel. The Etherchannel Is Then Added To The Spanning Tree Topology As A Single Bridge Port.

PAgP USES THREE MODES OF OPERATION:

  AUTO: Places An Interface Into A Passive Negotiating State, Meaning That The Interface Will Respond To PAgP Packets It Receives But It Will Not Initiate PAgP Packet Negotiation. This Setting Minimizes The Transmission Of PAgP Packets And Is The Default On Devices Like Catalyst 3560.

  DESIRABLE: Places An Interface Into An Active Negotiating State, Meaning That The Interface Will Start Negotiations With Other Interfaces By Sending PAgP Packets.

  On:Forces The Interface To Channel Without Pagp. With The On Mode, A Usable Etherchannel Exists Only When An Interface Group In The On Mode Is Connected To Another Interface Group In The On Mode. This Is Referred To As Static Aggregation.

*•-•*   OFF: Disable PAgP And Prevent Ports To Form A Port-Channel.

PAgP ETHERCHANNEL INTERFACE CONFIGURATION:

Switch(config)# interface fa 1/1/2
Switch(config-if)# channel-protocol PAgP
Switch(config-if)# channel-group number mode {on | {{auto | desirable} | [non-silent]}}

Switch(Config)# Port-Channel Load-Balance Src-Dst-Port
Switch(Config)# Interface Range Gig 3/1 – 4
Switch(Config-If)# Channel-Protocol PAgP
Switch(Config-If)# Channel-Group 1 Mode Desirable Non-Silent


By Default, PAgP Operates In Silent Submode - > Allowing Ports To Be Added To The Etherchannel, Even If It Does Not Hear Anything From The Far End. This Allows A Switch To Form An Etherchannel With A Non-PAgP Devices Such As A Network Analyzer Or Server. It Is Best Practice To Aways Use Non-Silent Mode When Connecting Two Switches Together.

AN ETHERCHANNEL IN CISCO CAN BE DEFINED AS A LAYER 2 ETHERCHANNEL OR A LAYER 3 ETHERCHANNEL:

  For Layer 2 Etherchannel, Physical Ports Are Placed Into An Etherchannel Group. A Logical Port-Channel Interface Will Be Created Automatically.

  For Layer 3 Etherchannel, A Layer 3 Switch Virtual Interface (SVI) Is Created And Then The Physical Ports Are Bound Into This Layer 3 SVI.


LACP (LINK AGGREGATION CONTROL PROTOCOL)


LINK AGGREGATION CONTROL PROTOCOL (LACP):

The Other Automatic Negotiation Protocol Is The Link Aggregation Control Protocol (LACP). LACP Is An Open Standard And Part Of The 802.3ad Specification. LACP, Like PAgP, Allows Multiple Ports To Be Automatically Bundled Into A Single Etherchannel. The Biggest Difference Is That LACP Can Be Used In Mixed Vendor Environments Because It Is An Open Standard.

  An open standard to PAgP
  IEEE 802.3ad
  Uses Priority System For End Switches
  Switch With The Lowest System Priority (2 Byte Value Followed By MAC – Lowest Wins) Determines Which Ports Are Active In The Etherchannel At Any Given Time.
  Uses Port Priority To Determine Which Ports To Place In Standby Mode If Hardware Limitations Do Not Allow All Ports To Participate In The Etherchannel.
  Most Implementations Leave The System And Port Priority To Defaults.

LACP, LIKE PAgP, HAS THREE MODES OF OPERATION:

  PASSIVE: The Switch Does Not Initiate The Channel, But Does Respond To Incoming LACP Packets. When A Peer Initiates Negotiation (By Sending Out An LACP Packet) Which We Receive And Reply To, Eventually Forming The Aggregation Channel With The Peer. This Is Similar To The Auto Mode In PAgP.

  ACTIVE:We Are Willing To Form An Aggregate Link And Will Actively Seek To Start The Negotiation. The Link Aggregate Will Be Formed If The Other End Is Running In LACP Active Or Passive Mode. This Is Similar To The Desirable Mode Of PAgP.

  ON:A Link Aggregation Is Forced To Be Formed Without Any LACP Negotiation. In Other Words, The Switch Will Neither Send The LACP Packet Nor Process Any Incoming LACP Packet. This Is Similar To The On State For PAgP. Again, This Is Referred To As Static Aggregation.

*•-•*   OFF: The Link Aggregation Will Not Be Formed. We Do Not Send Or Understand The LACP Packet. This Is Similar To The Off State For PAgP.

FOR LACP TO FUNCTION PROPERLY, A COUPLE OF OTHER PARAMETERS HAVE TO BE SET. THE PARAMETERS CAN BE SET AUTOMATICALLY OR THROUGH MANUAL CONFIGURATION:

◙ - ➤  SYSTEM PRIORITY: Each Switch Running LACP Must Have A System Priority. The Switch Automatically Uses The MAC Address And The System Priority To Form The System ID.

◙ - ➤  PORT PRIORITY: Each Port In The Switch Must Have A Port Priority. The Port Priority And The Port Number Form The Port Identifier. The Switch Uses The Port Priority To Decide Which Ports To Put In Standby Mode When A Hardware Limitation Prevents All Compatible Ports From Aggregating. A Hardware Limitation Could Be Something As Simple As The Switch Only Allows Four Ports To Be Placed In A Bundle.

◙ - ➤  ADMINISTRATIVE KEY: Each Port In The Switch Must Have An Administrative Key Value. The Administrative Key Defines The Ability Of A Port To Aggregate With Other Ports, Determined By A Few Factors. The Port Has Physical Characteristics, Such As Data Rate, Duplex Capability, And Point-To-Point Or Shared Medium.

LACP ETHERCHANNEL INTERFACE CONFIGURATION:

Switch(Config)# Lacp System-Priority Number (Optional)
Switch(Config)# Interface Fa 1/1/3
Switch(Config-If)# Channel-Protocol LACP
Switch(Config-If)# Channel-Group Number Mode {On | Passive | Active}
Switch(Config-If)#Lacp Port-Priority Number (Optional)




CONFIGURING ETHERCHANNEL EXAMPLES


CONFIGURING ETHERCHANNEL:

◙ - ➤  1. CONFIGURE THE PORT-CHANNEL INTERFACE:

The First Thing That You Have To Configure For The Etherchannel Is The Virtual Interface That The Switch Will Use Instead Of The Individual Ports. This Virtual Interface Is Called A Port-Channel. The Command To Configure It Is Interface Port-Channel Channel-Group Number.
Switch1(Config)#Interface Port-Channel 1

◙ - ➤  2. ASSIGN PHYSICAL PORTS TO THE PORT-CHANNEL INTERFACE.

Now That You Have Created The Port-Channel Interface, You Can Associate Physical Ports To It For Use In The Bundle. To Do That, Simply Go Into The Interface Configuration Mode On An Interface.
Switch1(Config)#Interface Range Fa0/19 – 20 - >

Notice When You Are Specifying The Ports, You Only Have To Specify The Slot (The Fa0/ Part Of The Port Number) Once. Then, You Specify The Actual Port Numbers 19–20.

This Is Because You Cannot Span Across A Slot In A Switch That Has More Than One Module Or Blade. If You Are Using The Range Command, The Ports You Are Selecting Must Be On The Same Module.

◙ - ➤  3. ASSOCIATE THE PORTS WITH A PORT-CHANNEL:

Now That You Have Selected A Port Or Range Of Ports, You Can Move On To The Etherchannel Configuration. The Next Thing To Do Is Tell The Ports What Port-Channel They Are Going To Be Associated With. Use The Channel-Group Command On The Interface For This Step. The Channel Group Number That You Specify Must Match The Port-Channel Interface Number That You Already Created. This Number Match Is What Associates The Two Features Together.
Switch1(Config-If)#Channel-Group 1

◙ - ➤  4. SET THE BUNDLING PROTOCOL.

If You Wanted To Change The Channeling Or Bundling Protocol From The Default Of PAgP To LACP, You Can Use The Channel-Protocol [PAgp | LACP] Command.

You May Have To Do This If You Are Connecting To A Different Vendors' Equipment Or A Server Device That Doesn't Support Cisco's PAgP.
Switch1(Config-If)#Channel-Protocol LACP

◙ - ➤  5. SET THE PORT NEGOTIATION MODE.

You Can Also Change The Mode In Which The Port Will Act In. Remember Auto Is The Default For PAgP And Passive Is The Default For LACP.

The Command To Change The Mode Is The Channel-Group Command That You Used Already; The Mode Is Appended To The End Of The Command. So Now The Command Is Channel-Group 1 Mode [Active | On | Auto | Desirable | Passive].
Switch1(Config-If)#Channel-Group 1 Mode Desirable

You Have Now Created A Regular Layer 2 Etherchannel Bundle. You Can Also Configure A Layer 3 Etherchannel Bundle. When The Network Includes A Layer 3 Core, Layer 3 Bundles Connect Your Distribution Switches To The Core Switches.

You Have To Create A Port-Channel Interface, But Now On The Interface You Have To Make It A Layer 3 Port. How Do We Do That On A Switch? If You Said, Use The “No Switchport” Command," You Are Right! When We Add Physical Ports Into The Bundle, We Will Also Have To Make Those Ports Into Layer 3 Ports.

◙ - ➤ CREATING A SAMPLE LAYER 3 ETHERCHANNEL:

LAYER 3 ETHERCHANNEL

AND ALSO WITH INTERFACE RANGE COMMAND:

Switch1(Config)#Interface Port-Channel 1
Switch1(Config-If)#No Switchport

Switch1(Config-If)#IP Address 192.168.30.1 255.255.255.0
Switch1(Config-If)#Interface Range Fa0/19 - 20
Switch1(Config-If)#Channel-Group 1
Switch1(Config-If)#No Switchport

That Is The Minimum Configuration That You Need To Create A Layer 3 Etherchannel. The Only Thing That I Threw In There On You Was The Ip Address Command. Since It Is Layer 3 Interface, It Has To Have An IP Address.

◙ - ➤ VERIFY THE CONFIGURATION AND OPERATION OF AN ETHERCHANNEL.

There Are A Couple Of Good Commands That You Can Use To Verify The Configuration And Operation Of An Etherchannel. First, Use The “Show Running-Config” Command To Check Your Configuration.
You Can Also Use The “Show Etherchannel Channel Number Port-Channel ”Command To See Some Statistics On The Interface.
Also Use Look At The Individual Port Statistics With The “Show Interfaces Fastethernet 0/1 Etherchannel” Command.

FAMILIARIZE WITH THE FOLLOWING COMMANDS:

Channel-Group Mode On - > This Command When Execute In Interface Configuration Mode Assigns That Particular Interface To A Channel Group Number Specified And Sets The Etherchannel Mode To Unconditional As Stated By The “On”
Show Etherchannel Summary - > This Command When Executed From User Or Privileged Mode Will Display A Summary Of Local Etherchannel(S) Properties Such As The Channel-Group Number, Ports In The Channel Group, And The Role The Ports The Play.
Show Etherchannel Detail - > This Command When Executed From User Or Privileged Mode Will Display Detailed Information Relating To The Etherchannel(S) Local To The Device.
Show Etherchannel Port-Channel - > This Command When Executed From User Or Privileged Mode Will Display The Etherchannel’s Logical Port-Channel Group Interface Properties.

ETHERCHANNEL TROUBLESHOOTING COMMANDS:

Show Etherchannel Summary - > Current Etherchannel Status Of Each Member Port.
Show Etherchannel Port-Channel - > Time Stamps Of Etherchannel Changes.
Show Etherchannel Detail - > Detailed Status About Each Etherchannel Component.
Show Etherchannel Load-Balance - > Load-Balancing Hashing Algorithm.
Show Etherchannel Port-Channel - > Load-Balancing Port Index Used By Hashing Algorithm.
Show {PAgP | LACP} Neighbor - > Etherchannel Neighbors On Each Port.
Show LACP SYS-ID - > LACP system ID.


SAMPLE ETHERCHANNEL CONFIGURATION EXAMPLE


SWITCH CONFIGURATION:

Switch#Config T
Switch(Config)#Int Fa 0/7
Switch(Config-If)#Channel-Group 1 Mode Desirable
Creating A Port-Channel Interface Port-Channel 1
Switch(Config-If)#Exit

Switch(Config)#Int Fa 0/8
Switch(Config-If)#Channel-Group 1 Mode Desirable
Switch(Config-If)#Exit

Switch(Config)#Int Fa 0/9
Switch(Config-If)#Channel-Group 1 Mode Desirable
Switch(Config-If)#Exit


THE BASIC PROCESS FOR CONFIGURING FOR AN ETHERCHANNEL INTERFACES IS AS FOLLOWS:

1. Connect To The Command-Line Interface (CLI) Your Switch. This Connection May Be Via SSH, Telnet, Or The Console Port.

2. Access Privileged EXEC Mode.
Switch1> Enable

3. Access Global Configuration Mode.
Switch1# Configure Terminal

4. Access Interface Configuration Mode.
Switch1(Config)# Interface Range Fasttethernet0/11 -12

5. Change Switchport To Trunk Or Access, But All Ports Must Be In The Same VLAN.
Switch1(Config-If-Range)# Switchport Mode Access
Switch1(Config-If-Range)# Switchport Access Vlan 10


6. Assign The Port To A Channel Group, Which Is An Integer Between 1 And 6, You Also Configure Pagp Or LCAP At This Time By Specifying A Mode, As Listed In The Below Table.
Switch1(Config-If-Range)# Channel-Group 5 Mode Desirable

The Following Commands Are The Setup Commands You Use For Configuring One Of The Switches For Etherchannel. Notice The Keyword "Desirable," Which Means That You Will Be Using The Cisco Proprietary Protocol Of PAgP. This Also Means That The Switch At The Other End Of The Connections Needs To Be A Cisco Switch As Well.

Switch1> Enable
Switch1# Configure Terminal
Switch1(Config)# Interface Range Fasttethernet0/11 -12
Switch1(Config-If-Range)# Switchport Mode Access
Switch1(Config-If-Range)# Switchport Access Vlan 10
Switch1(Config-If-Range)# Channel-Group 5 Mode Desirable
Switch1(Config-If-Range)# End


Note That On The Second Switch, You Applied The Following Configuration. Notice That The Channel-Group Used On This Switch Is Different. Different Port Groups Are Allowed Because It Is Simply A Local (To The Switch) Configuration To Keep Each Port Group Uniquely Identified. Many IT Administrators Do Keep The Channel-Group Numbers The Same Because By Matching The Port Group Numbers On Either End Of The Connection, You Can Avoid Confusion For Others.

Switch2> Enable
Switch2# Configure Terminal
Switch2(Config)# Interface Range Fasttethernet0/1 -2
Switch2(Config-If-Range)# Switchport Mode Access
Switch2(Config-If-Range)# Switchport Access Vlan 10
Switch2(Config-If-Range)# Channel-Group 2 Mode Auto
Switch2(Config-If-Range)# End


In This Configuration, This Pair Of Ports Allows You To Send Data Only For VLAN 10 Over The Etherchannel Link. To Pass Traffic For All VLANs, You Must Configure The Switchport As A Trunk Because Access Ports Will Only Send Traffic For One VLAN.



CONCLUSION:

The Goal Of This Article Is To Give An Easy Way To Understand The “PAgP VS LACP COMPARISON” And Also We Hope This Guide Will Help Every Beginner Who Are Going To Start Cisco Lab Practice Without Any Doubts. Some Topics That You Might Want To Pursue On Your Own That We Did Not Cover In This Article Are Listed Here!

Hands - On Experience Is An Invaluable Part Of Preparing For The Lab Exam And Never Pass Up An Opportunity To Configure Or Troubleshoot A Router ( If You Have Access To Lab Facilities, Take Full Advantage Of Them) There Is No Replacement For The Experience You Can Gain From Working In A Lab, Where You Can Configure Whatever You Want To Configure And Introduce Whatever Problems You Want To Introduce, Without Risk Of Disrupting A Production Network. Thank You And Best Of Luck

This Article Written Author By: Mr. Premakumar Thevathasan - CCNA And CCNP (Routing & Switching), MCSE, MCSA, MCSA - MSG, CIW Security Analyst, CompTIA Certified A+ And Etc.

WARNING AND DISCLAIMER:

Routers Direct And Control Much Of The Data Flowing Across Computer Networks. This Guide Provides Technical Guidance Intended To Help All Network Students, Network Administrators And Security Officers Improve Of Their Demonstrated Ability To Achieve Specific objectives Within Set Timeframes.

This Document Carries No Explicit Or Implied Warranty. Nor Is There Any Guarantee That The Information Contained In This Document Is Accurate. Every Effort Has Been Made To Make All Articles As Complete And As Accurate As Possible, But No Warranty Or Fitness Is Implied.

It Is Offered In The Hopes Of Helping Others, But You Use It At Your Own Risk. The Author Will Not Be Liable For Any Special, Incidental, Consequential Or Indirect Any Damages Due To Loss Of Data Or Any Other Reason That Occur As A Result Of Using This Document. But No Warranty Or Fitness Is Implied. The Information Provided Is On An "As Is" Basic. All Use Is Completely At Your Own Risk.

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