Common return values are documented herethe following are the fields unique to this module:. If you notice any issues in this documentation, you can edit this document to improve it. Ansible 2. List of Layer-3 interfaces definitions. Each of the entry in aggregate list should define name of interface name and a optional ipv4 or ipv6 address. Starting with Ansible 2. Specifies the password to use if required to enter privileged mode on the remote device. If authorize is false, then this argument does nothing.

Instructs the module to enter privileged mode on the remote device before sending any commands. If not specified, the device will attempt to execute all commands in non-privileged mode. IPv4 address to be set for the Layer-3 interface mentioned in name option. IPv6 address to be set for the Layer-3 interface mentioned in name option. Specifies the DNS host name or address for connecting to the remote device over the specified transport.

The value of host is used as the destination address for the transport. Specifies the password to use to authenticate the connection to the remote device. This value is used to authenticate the SSH session. Specifies the SSH key to use to authenticate the connection to the remote device. This value is the path to the key used to authenticate the SSH session. Specifies the timeout in seconds for communicating with the network device for either connecting or sending commands.

If the timeout is exceeded before the operation is completed, the module will error.

Layer 2 and Layer 3 Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9300 Switches)

Configures the username to use to authenticate the connection to the remote device. State of the Layer-3 interface configuration. It indicates if the configuration should be present or absent on remote device.

Deprecated Starting with Ansible 2. Name of the Layer-3 interface to be configured eg. A dict object containing connection details. Default: Specifies the port to use when building the connection to the remote device.Your software release may not support all the features documented in this module.

For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. An account on Cisco. EtherChannel provides fault-tolerant high-speed links between switches, routers, and servers.

You can use the EtherChannel to increase the bandwidth between the wiring closets and the data center, and you can deploy it anywhere in the network where bottlenecks are likely to occur. EtherChannel provides automatic recovery for the loss of a link by redistributing the load across the remaining links.

If a link fails, EtherChannel redirects traffic from the failed link to the remaining links in the channel without intervention. An EtherChannel consists of individual Ethernet links bundled into a single logical link. An EtherChannel comprises a channel group and a port-channel interface.

The channel group binds physical ports to the port-channel interface. Configuration changes applied to the port-channel interface apply to all the physical ports bound together in the channel group.

The channel-group command binds the physical port and the port-channel interface together. Each EtherChannel has a port-channel logical interface numbered from 1 to This port-channel interface number corresponds to the one specified with the channel-group interface configuration command.

With Layer 2 ports, use the channel-group interface configuration command to dynamically create the port-channel interface.

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You also can use the interface port-channel port-channel-number global configuration command to manually create the port-channel interface, but then you must use the channel-group channel-group-number command to bind the logical interface to a physical port. The channel-group-number can be the same as the port - channel-number, or you can use a new number.

If you use a new number, the channel-group command dynamically creates a new port channel. With Layer 3 ports, you should manually create the logical interface by using the interface port-channel global configuration command followed by the no switchport interface configuration command. You then manually assign an interface to the EtherChannel by using the channel-group interface configuration command.

With Layer 3 ports, use the no switchport interface command to configure the interface as a Layer 3 interface, and then use the channel-group interface configuration command to dynamically create the port-channel interface. PAgP can be enabled on cross-stack EtherChannels.

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By using PAgP, the device or device stack learns the identity of partners capable of supporting PAgP and the capabilities of each port. It then dynamically groups similarly configured ports on a single device in the stack into a single logical link channel or aggregate port.

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Similarly configured ports are grouped based on hardware, administrative, and port parameter constraints. After grouping the links into an EtherChannel, PAgP adds the group to the spanning tree as a single device port. Places a port into a passive negotiating state, in which the port responds to PAgP packets it receives but does not start PAgP packet negotiation.

This setting minimizes the transmission of PAgP packets. Places a port into an active negotiating state, in which the port starts negotiations with other ports by sending PAgP packets.The third layer of the OSI Model, the network layer, is where most network engineers focus their time and expertise. As Darragh commented in my post on the data link layerLayer 2 is cool but Layer 3 is the one that can take you places.

Layer 3, the network layer, is most commonly known as the layer where routing takes place. A router's main job is to get packets from one network to another.

Layer 3 protocols and technologies allow for network-to-network communications. A Layer 3 switch is simply a Layer 2 device that also does routing a Layer 3 function. Another key aspect of routers is that each interface on a router has its own IP address, because each of those interfaces is on a different networks.

So much of what we do as network administrators -- dealing with IP addresses and subnetting, routing protocols, firewall rules and Access Control Lists ACLsand many types of Quality of Service QoS -- is enabled by Layer 3 technologies. Layer 2 may make you an expert, but Layer 3 is how you get in the money. When troubleshooting network issues it's helpful to understand if the issue is occurring at Layer 2 or Layer 3 of the OSI model.

If you're able to get local communications to work but the packets aren't traversing your Layer 3 boundaries then you've got a Layer 3 issue on your hands.

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When troubleshooting Layer 3 issues, Layer 2 technologies can sometimes be a huge help. For instance, if you can't get communications from one side of a router to the distant side of an adjacent router checking for Layer 2 connectivty like with CDP for instance between the two devices can give you great insight into the problem.

If you've never used CDP the Cisco Discovery Protocol it's one worth getting to know as it can be very helpful in many different troubleshooting scenarios. It's not uncommon when visiting family for me to get asked to fix everyone's computers. The way that I usually respond is that asking me to fix your computer is sort of like asking the guy who designs super highways to fix your car. Yes, cars do run on highways and yes, I do drive a car to work everyday but it's not what I do.

This is a great analogy, but there is one key difference between cars on highways and packets on a network and it's at Layer 3. When you think about how cars get from one place to another -- even with some of the experimental technologies for self-driven cars - the intelligence that gets the car from one place to another is all in the vehicle.

With computer networks, all of the intelligence is at the intersections -- the Layer 3 devices. All the packet or car in this analogy really knows is where it's coming from and where it wants to go. The network does the rest. While it's important to have a solid foundation in Layer 1 and Layer 2 technologies, you can build a career on Layer 3 expertise. Don't go short here -- go to some classes, read a bunch of books, and most important -- get some hands-on experience with Layer 3 technologies.

Like I said, Layer 3 can take you places Understanding the OSI Model. The Physical Layer. The Data Link Layer one of my favorites. The Network Layer. Josh Stephens is the founder and CEO of Bearded Dog, an Austin-based strategy consulting and development company, specializing in tech innovation and IT management best practices.

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Sign In Register. Sign Out Sign In Register. Latest Insider. Check out the latest Insider stories here. More from the IDG Network.I will warn you up front that this article is going to be a tad technical, so bear with me. Since this site gets a broad audience with a wide range of technical skill levels, let me take a moment to describe what Layer 2 and Layer 3 mean, for anyone who does not know. Layer 2 and Layer 3 refer to different parts of IT network communications.

The reason we are having a discussion about layer 2 or layer 3, is that your choice of either layer has advantages and disadvantage in terms of scaling and costs. Layer 2 is the data link where data packets are encoded and decoded into bits.

The MAC Media Access Control sub layer controls how a computer on the network gains access to the data and permission to transmit it and the LLC Logical Link control layer controls frame synchronization, flow control and error checking.

layar 3 ios

Layer 3 provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet sequencing.

Some advantages of Layer 2 include lower costs, only requires switching, no routing gear is necessary and offers very low latency. Layer 2 also has some significant disadvantages such as the lack of router hardware, leaving them susceptible to broadcast storm and the additional administrative overhead of IP allocations due to flat subnet across multiple sites.

The Network Layer: Understanding layer 3 of the OSI Model

Anything transmitted by one device is forwarded to all devices. When the network gets too large, the broadcast traffic begins to create congestion and decreases network efficiency. This reduces overall traffic levels by allowing administrators to divide networks into smaller parts and restrict broadcasts to only that sub-network. This means there is a limit to the size of a layer 2 network. However, a properly configured layer 3 network with the correct knowledge and hardware can have infinite growth.

A Layer 3 switch is a high-performance device for network routing. A router works with IP addresses at layer 3 of the model. Layer 3 networks are built to run on on layer 2 networks. In an IP layer 3 network, the IP portion of the datagram has to be read. This requires stripping off the datalink layer frame information. Once the protocol frame information is stripped, the IP datagram has to be reassembled.

Once the IP datagram is reassembled, the hop count has to be decremented, the header checksum has to be recalculated, a lookup for routing must be made, and only then can the IP datagram be chopped back up and inserted into frames and transmitted to the next hop. All of this takes extra time. But the downsides of Layer 3 are speed because of all of the additional overhead, and that can be deadly in multi-site networks where fast communications among tens or hundreds of computers, servers and routing equipment are necessary for such things as Ip-telephony, or even shared internet access.

Multiprotocol Label Switching is a mechanism in high-performance telecommunications networks which directs and carries data from one network node to the next. It can encapsulate packets of various network protocols.A layer 2 switch can only route traffic based on MAC addresses. A layer 3 switch can route using IP addresses, Hence why a layer 3 switch can also be classified as a router and vice versa.

Just to be pedantic Also, they may not be full layer-3 capable. You need to double check the docs, some switches will have a smaller subset of layer-3 routing capabilities but are not true layer-3 devices.

All switches are layer 2. These switches will move traffic to specific ports based on source and destination MAC addresses link layer. Almost all "smart" switches and all "managed" switches are layer 3. All "unmanaged" switches are layer 2. FYI - An ethernet hub is layer 1 physical layer. There's no intelligence to these things at all. The data that goes in any port is spewed out of all ports. They work exactly the same as the old coax cables. Most of the time, the extra layer 3 features are available for an additional license fee, but those features are usually only needed for very specific purposes.

To continue this discussion, please ask a new question. Get answers from your peers along with millions of IT pros who visit Spiceworks. Popular Topics in General Networking. Spiceworks Help Desk. The help desk software for IT.

Track users' IT needs, easily, and with only the features you need. Lookup the model number online. Check to see if it can IP route in the settings. Bob Aug 1, at UTC.Dynamips can run unmodified IOS images. In the new GNS3 1. What are the differences? Here are the major differences:. Importa n t points. Should I use a mainline and technology train image? IOS version Currently, the c images are the only ones still available for download for those with a support contract.

Only the c series get newer IOS 15 images.

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All other platforms are now end-of-life and only support IOS You will find the technology train images to contain the newest features but it may also contain the most bugs. We recommend Mainline over Technology train if you are interested on stability without the need of new features.

The minimum RAM is the amount of memory needed for IOS to work at maximum capacity with most feature configured and activated. From experience you can usually use a bit less RAM just fine. Idle-PC values are not required with virtual machines or docker containers. Note that interfaces do not use a slot designation e. File name: cadventerprisek9-mz. MD5: 3ed8d56aae Proposed idle-PC value: 0xa MD5: dee85a2bffd.

Proposed idle-PC value: 0xa4dc4. MD5: 8eca1f6fe57dfb3c3cfc0e Proposed idle-PC value: 0xc MD5: 12bb23e2ecaeacf. Proposed idle-PC value: 0xec The c supports up to 2 Network Modules maximum of 8 Ethernet ports, 32 FastEthernet ports or 8 serial ports.

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File name: ca3jk8s-mz. MD5: dd34badef54ba48bf4c97b4. Proposed idle-PC value: 0xa8bac. The c supports up to 4 Network Modules maximum of 16 Ethernet ports, 32 FastEthernet ports or 16 serial ports.

File name: ca3js-mz.

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MD5: db9f63ca1b46d18fbbfffea. Proposed idle-PC value: 0xb File name: ca3jk9s-mz.


MD5: 4ac7ef13cddc Proposed idle-PC value: 0xf8. MD5: b7aaa08e94af1e6. Proposed idle-PC value: 0xe0b4. MD5: a8e1fddce42e5. Proposed idle-PC value: 0x60a48cb8.A layer 3 etherchannel is similar to an interface on a router. Before we configure the port channel settings you need to make sure that all interfaces have the exact same configuration. Once you use the channel-group command, the port-channel interface will automatically inherit all settings from your physical interface. If you forget to run the no switchport command on an interface, your etherchannel will be layer 2 instead of layer 3!

Just like any other layer 3 interface we can configure an IP address on this port-channel interface:. Explained As Simple As Possible. Full Access to our Lessons. More Lessons Added Every Week!

This was an error which I just fixed. If you assign physical interfaces to a non-existing port channel then it will be automatically created. When I try, the etherchannel is always suspended at both ends. Ask a question or join the discussion by visiting our Community Forum.

Skip to content Search for: Search. Just like any other layer 3 interface we can configure an IP address on this port-channel interface: SW1 config interface port-channel 12 SW1 config-if ip address You may cancel your monthly membership at any time.

No Questions Asked! Previous Lesson Introduction to Etherchannel. Next Lesson Troubleshooting Etherchannel. Load balancing is the same for L2 and L3 and you can Continue reading in our forum. Let me give you two examples for a typica We use cookies to give you the best personal experience on our website.

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