The configuration of the switches has been cleared with the clear config all command. The commands are the pretty much the same as other cisco products. Record the commands used to display the output in example 31. There are various troubleshooting commands to test and verify the behavior of your etherchannel. This is a list of commands to use to troubleshoot the configuration. If the test justifies the need for link aggregation then go ahead and do it.
Etherchannel etherchannel load balancing algorithm. This cisco web site carries a boat load regarding techie information. Link aggregation configuration ccna routing and switching. Packet tracer configuring etherchannel ccna resources. Understanding etherchannel the process used to bundle ports together in an ethernet switch to achieve higher bandwidth is known as etherchannel or link aggregation. Lab configuring etherchannel topology addressing table. Etherchannel troubleshooting commands etherchannel. Etherchannel technology was invented in the early 1990s. The choice of commands available are different more or less based on l2 or l3 state of the ports and yes, no switchport command will do that for you. Link aggregation is a nebulous term used to describe various implementations and underlying technologies. For example, a bundle of four switchports into one etherchannel would provide four times the bandwidth coming to. Use the show etherchannel summary command to verify that the port channels are up and in use.
Using your knowledge of etherchannel and standard testing methods, find and correct the errors. Etherchannel technique is known as nic teaming in windows and ethernet bridging in linux. In general, link aggregation looks to combine aggregate multiple network connections in parallel to increase throughput and provide redundancy. Etherchannel configuration on cisco switch learn linux ccna. Etherchannel is a port link aggregation technology or portchannel architecture used primarily on cisco switches. Most of the issues with etherchannels link aggregation are because of misconfiguration. Record the commands used to correct the configurations. As traffic passes through the etherchannel, the algorithm will convert the. Etherchannel connections to windows server and portfast. The following commands are the setup commands you use for configuring one of the switches for etherchannel. Sep 26, 2016 troubleshooting etherchannel etherchannel cisco configure cisco switch cisco aggregation switch. Here is a topology in which two switches are connected with one pc each.
Finding the mac address of windows or mac computer finding the mac. Hi everyone, need to confirm if cisco switch 4500 has etherchannel that has connections going to server is this config ok switchport access vlan 20 switchport mode access no cdp enable channelgroup 4 mode on second thing to know is is there any advantage if i config spanning tree portfast on ab. Use the show interfaces trunk command to verify trunk settings. Yes, troubleshooting the physical layer is not as sexy as say, troubleshooting on a cisco adaptive security appliance asa, but it is just as useful.
Once completely correctly r1 should ping r2 by traversing the etherchannel. The choice of commands available are different more or less based on l2 or l3 state of the. Most configuration settings on an etherchannel s member links must be the same, and inconsistent settings will cause link members to become suspended. Very rudimentary and easy, though troubleshooting usually isnt so easy. Notice the keyword desirable, which means that you will be using the cisco proprietary protocol of pagp. Keep in mind that the configuration of all physical interfaces has to match.
Find answers to etherchannel command on a nexus 7000 from the expert community at experts exchange. Sep 10, 2010 the ccnp training manual i have doesnt talk about how the etherchannel becomes its own port that may not be configured by default in the same way on the other switch. Now i am going to configure ether channel and for this we need atleast two ethernet ports. Interfaces in active mode will actively try to form an etherchannel. Troubleshooting commands when problems arise on cisco devices, there are a number of show commands you can use to help identify what the problem is.
To take advantage of inbound traffic aggregation, the switch ports will have to be configured for etherchannel. Etherchannel overview etherchannel is a cisco technology that enables the aggregation or bundling of switchports into one logical link. The loadbalancing algorithm will create an index that associates link0 with a binary bit of 0, and link1 with a bit of 1. The ccnp training manual i have doesnt talk about how the etherchannel becomes its own port that may not be configured by default in the same way on the other switch. Etherchannel command on a nexus 7000 solutions experts exchange. Part 1 defines what etherchannel is and cases for using it in your networks from a nontechnical perspective. The switches used are cisco catalyst 2960s with cisco ios release 15.
While there are many approaches, this article aims to highlight the differences in terminology. All interfaces in each etherchannel must be the same speed and duplex, and both ends of the channel must be configured as either a layer 2 or layer 3 interface. Windows server 2012 r2 built in nic teaming code enables link aggregation of multiple network adapters with same speeds for outbound traffic from the host. Configuring link aggregation with etherchannel ciscozine. You get a very good gono go indication if all the ports are working correctly. This command when executed from user or privileged mode will display a summary of local etherchannels properties such as the channelgroup number, ports in the channel group, and the role the ports the play. Verify that all the physical ports in the topology are set to trunking and correct any access mode. Chapter objectives indicate key concepts for focused study.
You also have different options to choose from when you configure the interface. The mss lacp hashing algorithm uses traffics sourcedestination ip, mac, and port to determine which bonded link to utilize. Interface fa0 and fa014 are both in use for this etherchannel. Etherchannel troubleshooting commands cisco community.
Welcome to cisco network learning youtube channel subscribe this channel to get notification of new video contact me. There are three different methods to configure etherchannel in cisco switch. To identify the protocol issues use the command show etherchannel summary. Etherchannel bundles individual ethernet links into a single logical link that provides bandwidth up to 1600 mbps fast etherchannel, full duplex or 16 gbps gigabit etherchannel between two cisco catalyst switches. The first command will show you all of the ports assigned to a particular portchannel setup. Nov 04, 2008 etherchannel bundles individual ethernet links into a single logical link that provides bandwidth up to 1600 mbps fast etherchannel, full duplex or 16 gbps gigabit etherchannel between two cisco catalyst switches. On interfaces becomes member of the etherchannel but does not negotiate. In this lesson well take a look at some common issues with etherchannels. My 3550 and 2950 decided on different setups apparently. An etherchannel is a link aggregation technology whereby two switches are connected together with multiple interfaces which are bundled together to form a single logical interface. Implementing and troubleshooting etherchannel hack and. All interfaces in each etherchannel must be the same speed and duplex, and both ends of the channel must be configured as either a.
This gives you a lot of information but im particularly interested in seeing if lacp is configured for passive or active mode. You should repeat the above commands to all aggregated interfaces on both switches. Catalyst 3750x and 3560x switch software configuration guide. Port aggregation protocol pagp also called etherchannel is a cisco proprietary protocol that is used for bundling two or more physical ports into single logical port. Port channels and lacp this chapter describes channel groups, port channels, port channel. Packet tracer configuring etherchannel instructor version instructor note. Lab troubleshooting etherchannel topology addressing table device interface ip address subnet mask s1 vlan 99 192. Lacp allows cisco switches to manage ethernet channels between switches that conform to the. Take the time to understand usual switch operation. Here are some etherchannel troubleshooting commands that you may want to use when setting up a new etherchannel configuration. Dec 16, 2018 welcome to cisco network learning youtube channel subscribe this channel to get notification of new video contact me. Instead of seeing physical links, you should see your etherchannel in the spanningtree show commands. The basic process for configuring your etherchannel interfaces is as follows.
Configuring etherchannel utilizing lacp free ccna workbook. Tools and troubleshooting link aggregation and load balancing. Switching protocols vlan trunking protocols intervlan hsrp stp etherchannel. The only authorized textbook for the cisco networking academy program ccnp 4. Part 2 dives into the actual details of the protocols and how to configure them on your devices. L3 etherchannel configuration solutions experts exchange. Sep 26, 2016 this packet tracer required for troubleshooting skills, and such a skillset shall be delivered.
Active interface will actively ask the other side to become an etherchannel. Oct 12, 2015 port aggregation protocol pagp also called etherchannel is a cisco proprietary protocol that is used for bundling two or more physical ports into single logical port. It allows grouping of several physical ethernet links to create one logical ethernet link for the purpose of providing faulttolerance and highspeed links between switches, routers and servers. On the condition of etherchannel function of aix, when the data exchange between the nodes on the network, there sometimes lost datat packets and cause the application failed. In this document, the etherchannel configuration uses pagp for autonegotiation. Etherchannel negotiation an etherchannel can be established using one of three mechanisms. Mar 14, 2020 enter configuration commands, one per line.
Red font color or gray highlights indicate text that appears in the instructor copy only. An etherchannel can be created from between two and eight active fast, gigabit or 10. This also means that the switch at the other end of the connections needs to be a cisco switch as well. Ill also recommend defaulting the ports especially with the issues youre experiencing and start all over. All ports that participate in etherchannel need to actively negotiate the link as lacp, as opposed to pagp. Etherchannel configuration on cisco switch learn linux.
Basically, most errors were from mismatched groups and some port assignment issues. Ccna portable commands includes the cisco ios commands and examples of the following. Correct and identify port channel protocol issue on s3. Interfaces in passive mode will only respond to lacp requests. Normally, occupying shrub would certainly obstruct these types of parallel connections concerning units since they are loops, yet etherchannel works beneath occupying shrub, to ensure that occupying shrub considers every one of the plug. Cisco meraki ms switches allow the use of the open standard lacp to provide layer 2 link aggregation, in the form of link bonding as described above. To troubleshooting etherchannel, you need to looking for assessing ports, and they will not be mixed with one port green and another port orange take a look at topology diagram step 1. In the example below, an already configured switchindependent nic team is converted to static. Once we deconfig etherchannel and use the single adapter configuration, the application works. Implementing unneccessary components, functions, methods, etc.
Bundling multiple switchport ethernet links into one logical channel increases bandwidth as well creating redundancy and fault tolerance. Link aggregation can be useful when interconnecting switches together and when interconnecting other devices to a switch, e. All catalyst switches running catos system software support. Network troubleshooting companion guide contains all the information from the online curriculum. This chapter describes how to use the commandline interface cli to configure etherchannel on the catalyst 4500 series switch layer 2 or layer 3 interfaces.
Use the show etherchannel portchannel command to check if the portchannel is active or not. Layer 3 etherchannel first of all, you cannot convert an active portchannel from layer 2 to layer 3 or vice versa, so if you have plans to do so, make sure it is during an outage window and that you have access to both devices outside of the. This packet tracer required for troubleshooting skills, and such a skillset shall be delivered. If the etherchannel does not come up, shut down the physical interfaces on both ends of the etherchannel and then bring them back up again. Lab troubleshooting etherchannel troubleshoot and correct the configuration errors and document your work. Load sharing balancing is based either on source or destination mac address of the transmitting computers when layer 2 etherchannel is used. Etherchannel etherchannel load balancing algorithm pagp. Do not overlook the physical layer when you troubleshoot. Verify the operation of the etherchannel trunk link by verifying ip communication between r1 and r2 using the ping command. You must complete the prerequisites before this verification can be successful. If the problems are wireless, look for sources of interference that. Below are the commands used to debug and fix the errors present in the topology.
Configuring link aggregation between ms and cisco switches. For a user having connectivity issues, look around her system. Oct 15, 2014 etherchannel overview etherchannel is a cisco technology that enables the aggregation or bundling of switchports into one logical link. The two links in the etherchannel can be represented in one binary bit. This connection may be via ssh, telnet, or the console port. Etherchannel can provide high availability and increase bandwidth at the same time. Etherchannel is a port link aggregation technology in which multiple physical port. Copy the running configuration to startup configuration. The show interfaces trunk and show spanningtree commands also show the port channel as one logical link. Etherchannel command on a nexus 7000 solutions experts. Configure a redundant etherchannel link background three.
Resolve all problems found in the outputs from the previous show commands. Cisco switch etherchannel configuration lacp pagp in this article we will describe how to configure both lacp and pagp etherchannels on cisco switches. Connect to the commandline interface cli your switch. Aug 11, 2014 windows server 2012 r2 built in nic teaming code enables link aggregation of multiple network adapters with same speeds for outbound traffic from the host. Windows 2012 server nic teaming load balancingfailover. To change the parameters of all ports in an etherchannel, apply configuration commands to the portchannel interface, for example, spanning. Ensure that all of the etherchannels use port aggregation protocol pagp, and that all hosts are reachable. In general, link aggregation looks to combine aggregate multiple network connections in. Configuration an etherchannel must be configured using the cisco ios on switches and router, and. It also provides guidelines, procedures, and configuration examples. Implementing and troubleshooting etherchannel hack and tinker.
Etherchannel connections to windows server and portfast cisco. Ccnp etherchannel trunk configuration your network. Verify that the physical ports are configured as indicated. That output includes router as well as an etherchannel switch 12 across two interfaces, so you know that youre looking at a layer 2 connectivity. Configuring an etherchannel link free ccna workbook. Etherchannel configuration guidelines and restrictions, page 195 configuring etherchannel, page 196 displaying etherchannel to a virtual switch system, page 1916 note the commands in the following sections can be used on all ethernet interfaces on a catalyst 4500 series switch, including the uplink ports on the supervisor engine. Etherchannel settings has to be a similar about equally facets of the links involved in the sales channel. For compatibility reasons, the network design team chose to use lacp across the network. Configuring windows server 2012 r2 nic teaming with. This provides highly resilient and equal load distribution across 2. Jan 28, 2015 instead of seeing physical links, you should see your etherchannel in the spanningtree show commands. Configure the etherchannel load balancing method on global config mode portchannel loadbalance srcdstip. Etherchannel is often used between the switches in order to increase the capacity of the connection between them by performing a load balancing of the frames traversing the channel. The best command to use is show etherchannel detail.
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