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Contents. In, the term link aggregation applies to various methods of combining multiple network connections in parallel in order to increase beyond what a single connection could sustain, and to provide in case one of the links should fail. A Link Aggregation Group (LAG) combines a number of physical ports together to make a single high-bandwidth data path, so as to implement the traffic load sharing among the member ports in the group and to enhance the connection reliability. Other umbrella terms used to describe the method include port trunking, link bundling, Ethernet/network/NIC bonding, channel bonding or NIC teaming. These umbrella terms encompass not only vendor-independent standards such as (LACP) for defined in or the previous, but also various proprietary solutions. Can implement aggregation at any of the lowest three layers of the. Examples of aggregation at layer 1 include (e.g.

IEEE 802.11) network devices that combine multiple frequency bands. OSI layer 2 (, e.g. In LANs or in WANs, Ethernet ) aggregation typically occurs across switch ports, which can be either physical ports, or virtual ones managed by an operating system. Aggregation at layer 3 in the OSI model can use, hash values computed from fields in the packet header, or a combination of these two methods. Regardless of the layer on which aggregation occurs, it is possible to balance the network load across all links.

However, implementations take advantage of this. Most methods provide as well.

Combining can either occur such that multiple interfaces share one logical address (i.e. IP) or one physical address (i.e. MAC address), or it allows each interface to have its own address.

The former requires that both ends of a link use the same aggregation method, but has performance advantages over the latter. Channel bonding is differentiated from in that load balancing divides traffic between network interfaces on per ( layer 4) basis, while channel bonding implies a division of traffic between physical interfaces at a lower level, either per packet ( Layer 3) or a data link ( Layer 2) basis. Description Link aggregation addresses two problems with connections: bandwidth limitations and lack of resilience. With regard to the first issue: bandwidth requirements do not scale linearly.

Ethernet bandwidths historically have increased tenfold each generation: 10 /s, 100 Mbit/s, 1000 Mbit/s, 10,000 Mbit/s. If one started to bump into bandwidth ceilings, then the only option was to move to the next generation which could be cost prohibitive. An alternative solution, introduced by many of the network manufacturers in the early 1990s, is to combine two physical Ethernet links into one logical link via. Most of these solutions required manual configuration and identical equipment on both sides of the aggregation.

The second problem involves the three in a typical port-cable-port connection. In either the usual computer-to-switch or in a switch-to-switch configuration, the cable itself or either of the ports the cable is plugged into can fail.

Multiple physical connections can be made, but many of the were not designed to completely seamlessly. IEEE link aggregation Standardization process By the mid 1990s, most network switch manufacturers had included aggregation capability as a proprietary extension to increase bandwidth between their switches.

But each manufacturer developed its own method, which led to compatibility problems. The IEEE 802.3 group took up a study group to create an inter-operable standard in a November 1997 meeting. The group quickly agreed to include an automatic configuration feature which would add in redundancy as well. This became known as 'Link Aggregation Control Protocol'. Initial release 802.3ad in 2000 As of 2000, most gigabit channel-bonding schemes use the IEEE standard of Link Aggregation which was formerly clause 43 of the standard added in March 2000 by the IEEE 802.3ad task force.

Nearly every network equipment manufacturer quickly adopted this joint standard over their proprietary standards. Move to 802.1 layer in 2008 The 802.3 maintenance task force report for the 9th revision project in November 2006 noted that certain 802.1 layers (such as security) were positioned in the below Link Aggregation which was defined as an sublayer. To resolve this discrepancy, the 802.3ax (802.1AX) task force was formed, resulting in the formal transfer of the protocol to the 802.1 group with the publication of IEEE 802.1AX-2008 on 3 November 2008. Link Aggregation Control Protocol Within the IEEE specification, the Link Aggregation Control Protocol (LACP) provides a method to control the bundling of several physical together to form a single logical channel. LACP allows a network device to negotiate an automatic bundling of links by sending LACP packets to the peer (directly connected device that also implements LACP). LACP Features and practical examples.

Maximum number of bundled ports allowed in the port channel: Valid values are usually from 1 to 8. LACP packets are sent with multicast group MAC address 01:80:c2:00:00:02 (01-80-c2-00-00-02). During LACP detection period. LACP packets are transmitted every second. Keep alive mechanism for link member: (default: slow = 30s, fast=1s). LACP can have the port-channel load-balance mode:.

link (link-id) Integer that identifies the member link for load balancing. The range is from 1 to 8. LACP mode:. active: Enables LACP unconditionally. passive: Enables LACP only when an LACP device is detected. (This is the default state) Advantages over static configuration. Failover occurs automatically: When a link fails and there is (for example) a between the devices, a peer system will not perceive any connectivity problems.

With static link aggregation, the peer would continue sending traffic down the link causing the connection to fail. Dynamic configuration: The device can confirm that the configuration at the other end can handle link aggregation. With Static link aggregation, a cabling or configuration mistake could go undetected and cause undesirable network behavior. Practical notes LACP works by sending frames (LACPDUs) down all links that have the protocol enabled.

If it finds a device on the other end of the link that also has LACP enabled, it will also independently send frames along the same links enabling the two units to detect multiple links between themselves and then combine them into a single logical link. LACP can be configured in one of two modes: active or passive. In active mode it will always send frames along the configured links. In passive mode, however, it acts as 'speak when spoken to', and therefore can be used as a way of controlling accidental loops (as long as the other device is in active mode). Proprietary link aggregation In addition to the IEEE link aggregation substandards, there are a number of proprietary aggregation schemes including Cisco's and, Juniper's, AVAYA's, and, ZTE's 'Smartgroup', Huawei's 'Eth-Trunk', or 's Speedify. Most high-end network devices support some kind of link aggregation, and software-based implementations – such as the lagg package, bonding driver, dladm aggr, etc.

– also exist for many operating systems. Linux bonding driver The Linux bonding driver provides a method for aggregating multiple (NICs) into a single logical bonded interface of two or more so-called (NIC) slaves. The majority of modern come with a which has the Linux bonding driver integrated as a and the ifenslave (if = network interface) control program pre-installed.

Programmed the original Linux bonding driver. It came into use with the patches for the kernel 2.0.

Driver modes Modes for the Linux bonding driver (network interface aggregation modes) are supplied as parameters to the kernel bonding module at load time. They may be given as command line arguments to the insmod or modprobe command, but are usually specified in a Linux distribution-specific configuration file. The behavior of the single logical bonded interface depends upon its specified bonding driver mode. The default parameter is balance-rr. Round-robin (balance-rr) Transmit in sequential order from the first available network interface (NIC) slave through the last. This mode provides. Active-backup (active-backup) Only one NIC slave in the bond is active.

A different slave becomes active if, and only if, the active slave fails. The single logical bonded interface's is externally visible on only one (port) to avoid distortion in the. This mode provides fault tolerance. XOR (balance-xor) Transmit network packets based on a hash of the packet's source and destination. The default algorithm only considers MAC addresses ( layer2).

Newer versions allow selection of additional policies based on IP addresses ( layer2+3) and TCP/UDP port numbers ( layer3+4). This selects the same NIC slave for each destination MAC address, IP address, or IP address and port combination, respectively. This mode provides load balancing and fault tolerance. Broadcast (broadcast) Transmit network packets on all slave network interfaces. This mode provides fault tolerance. IEEE 802.3ad Dynamic link aggregation (802.3ad, LACP) Creates aggregation groups that share the same speed and duplex settings.

Utilizes all slave network interfaces in the active aggregator group according to the 802.3ad specification. This mode is similar to the XOR mode above and supports the same balancing policies. The link is set up dynamically between two LACP-supporting peers. Adaptive transmit load balancing (balance-tlb) Linux bonding driver mode that does not require any special network-switch support. The outgoing network packet traffic is distributed according to the current load (computed relative to the speed) on each network interface slave. Incoming traffic is received by one currently designated slave network interface. If this receiving slave fails, another slave takes over the MAC address of the failed receiving slave.

Adaptive load balancing (balance-alb) includes balance-tlb plus receive load balancing (rlb) for IPV4 traffic, and does not require any special network switch support. The receive load balancing is achieved by negotiation.

The bonding driver intercepts the ARP Replies sent by the local system on their way out and overwrites the source hardware address with the unique hardware address of one of the NIC slaves in the single logical bonded interface such that different network-peers use different MAC addresses for their network packet traffic. Linux Team driver The Linux Team driver provides an alternative to bonding driver. The main difference is that Team driver kernel part contains only essential code and the rest of the code (link validation, LACP implementation, decision making, etc.) is run in userspace as a part of teamd daemon. Usage Network backbone Link aggregation offers an inexpensive way to set up a high-speed that transfers much more data than any one single port or device can deliver. Link aggregation also allows the network's backbone speed to grow incrementally as demand on the network increases, without having to replace everything and buy new hardware.

Most backbone installations install more cabling or fiber optic pairs than is initially necessary, even if they have no immediate need for the additional cabling. This is done because labor costs are higher than the cost of the cable, and running extra cable reduces future labor costs if networking needs change. Link aggregation can allow the use of these extra cables to increase backbone speeds for little or no extra cost if ports are available. Order of frames When balancing traffic, network administrators often wish to avoid reordering Ethernet frames. For example, TCP suffers additional overhead when dealing with out-of-order packets. This goal is approximated by sending all frames associated with a particular session across the same link. Common implementations use L2 or L3 hashes (i.e.

Based on the MAC or the IP addresses), ensuring that the same flow is always sent via the same physical link. However, this may not provide even distribution across the links in the trunk when only a single or very few pairs of hosts communicate with each other, i.e. When the hashes provide too little variation. It effectively limits the client bandwidth in an aggregate to its single member's maximum bandwidth per communication partner. In extreme, one link is fully loaded while the others are completely idle.

For this reason, an even load balancing and full utilization of all trunked links is almost never reached in real-life implementations. More advanced switches can employ an L4 hash (i.e. Using TCP/UDP port numbers), which may increase the traffic variation across the links – depending on whether the ports vary – and bring the balance closer to an even distribution. Maximum throughput Multiple switches may be utilized to optimize for maximum in a multiple network switch, when the switches are configured in parallel as part of an isolated network between two or more systems. In this configuration, the switches are isolated from one another. One reason to employ a topology such as this is for an isolated network with many hosts (a cluster configured for high performance, for example), using multiple smaller switches can be more cost effective than a single larger switch. If access beyond the network is required, an individual host can be equipped with an additional network device connected to an external network; this host then additionally acts as a gateway.

The network interfaces 1 through 3 of node A, for example, are connected via separate network switches 1 through 3 with network interfaces 1 through 3 of node B; there are no inter-connections between the network switches 1 through 3. The linux bonding driver mode typically employed in configurations of this type is balance-rr; the balance-rr mode allows individual connections between two hosts to effectively utilize greater than one interface's bandwidth. Use on network interface cards NICs trunked together can also provide network links beyond the throughput of any one single NIC.

For example, this allows a central file server to establish an aggregate 2-gigabit connection using two 1-gigabit NICs teamed together. Note the data signaling rate will still be 1Gbit/s, which can be misleading depending on methodologies used to test throughput after link aggregation is employed. Microsoft Windows Server 2012 supports link aggregation natively. Previous Windows Server versions relied on manufacturer support of the feature within their software., for example, released Advanced Networking Services (ANS) to bond Intel Fast Ethernet and Gigabit cards. Also supports 'teaming' with their Nvidia Network Access Manager/Firewall Tool. Also has a teaming tool for HP branded NICs which will allow for non-EtherChanneled NIC teaming or which will support several modes of EtherChannel (port aggregation) including 802.3ad with LACP.

In addition, there is a basic layer-3 aggregation (available at least from Windows XP SP3), that allows servers with multiple IP interfaces on the same network to perform load balancing, and home users with more than one internet connection, to increase connection speed by sharing the load on all interfaces. Offers advanced functions via Broadcom Advanced Control Suite (BACS), via which the teaming functionality of BASP ('Broadcom Advanced Server Program') is available, offering 802.3ad static LAGs, LACP, and 'smart teaming' which doesn't require any configuration on the switches to work. It is possible to configure teaming with BACS with a mix of NICs from different vendors as long as at least one of them is Broadcom and the other NICs have the required capabilities to create teaming.

Linux and UNIX , and commercial Unix distributions such as implement Ethernet bonding (trunking) at a higher level, and can hence deal with NICs from different manufacturers or drivers, as long as the NIC is supported by the kernel. Virtualization platforms and have native support for link-aggregation.

XenServer offers both static-LAG's as well as LACP. VSphere 5.1 (ESXi) now supports both static-LAG's and LACP natively with their virtual distributed switch. For Microsoft's, bonding or teaming isn't offered from the hyper-visor or OS-level, but the above-mentioned methods for teaming under Windows applies to Hyper-V as well. Limitations Single switch With modes balance-rr, balance-xor, broadcast and 802.3ad all physical ports in the link aggregation group must reside on the same logical switch, which in most scenarios will leave a single point of failure when the physical switch to which both links are connected goes offline. Modes active-backup, balance-tlb, and balance-alb can also be set up with two or more switches. But after failover (like all other modes), in some cases, active sessions may fail (due to ARP problems) and have to be restarted. However, almost all vendors have proprietary extensions that resolve some of this issue: they aggregate multiple physical switches into one logical switch.

The (SMLT) protocol allows multiple Ethernet links to be split across multiple switches in a stack, preventing any single point of failure, and additionally allowing all switches to be load balanced across multiple aggregation switches from the single access stack. These devices synchronize state across an (IST) such that they appear to the connecting (access) device to be a single device (switch block) and prevent any packet duplication. SMLT provides enhanced resiliency with sub-second failover and sub-second recovery for all speed trunks (10 Mbit/s, 100 Mbit/s, 1,000 Mbit/s, and 10 Gbit/s) while operating transparently to end-devices. Same link speed In most implementations, all the ports used in an aggregation consist of the same physical type, such as all copper ports (10/100/1000BASE‑T), all multi-mode fiber ports, or all single-mode fiber ports. However, all the IEEE standard requires is that each link be full duplex and all of them have an identical speed (10, 100, 1,000 or 10,000 Mbit/s). Many switches are PHY independent, meaning that a switch could have a mixture of copper, SX, LX, LX10 or other GBICs. While maintaining the same PHY is the usual approach, it is possible to aggregate a 1000BASE-SX fiber for one link and a 1000BASE-LX (longer, diverse path) for the second link, but the important thing is that the speed will be 1 Gbit/s full duplex for both links.

One path may have a slightly longer propagation time but the standard has been engineered so this will not cause an issue. Ethernet aggregation mismatch Aggregation mismatch refers to not matching the aggregation type on both ends of the link.

Some switches do not implement the 802.1AX standard but support static configuration of link aggregation. Therefore, link aggregation between similarly statically configured switches will work, but will fail between a statically configured switch and a device that is configured for LACP. Examples Ethernet. Further information on link aggregation:, and On interfaces, channel bonding requires assistance from both the Ethernet and the host computer's, which must of frames across the network interfaces in the same manner that I/O is striped across disks in a array.

For this reason, some discussions of channel bonding also refer to (RAIN) or to 'redundant array of independent network interfaces'. Modems In analog modems, multiple links over may be bonded. Throughput over such bonded connections can come closer to the aggregate bandwidth of the bonded links than can throughput under routing schemes which simply load-balance outgoing network connections over the links. DSL Similarly, multiple can be bonded to give higher bandwidth; in the, is sometimes to give for example 512kbit/s upload bandwidth and 4 megabit/s download bandwidth, in areas that only have access to 2 megabit/s bandwidth. DOCSIS Under the DOCSIS 3.0 and 3.1 specifications for data over cable TV (CATV) systems, multiple channels may be bonded.

Under DOCSIS 3.0, up to 32 downstream and 8 upstream channels may be bonded. These are typically 6 or 8MHz wide.

DOCSIS 3.1 defines more complicated arrangements involving aggregation at the level subcarriers and larger notional channels. Wireless Broadband bonding is a type of channel bonding that refers to aggregation of multiple channels at at level four or above. Channels bonded can be wired links such as a.

Additionally, it is possible to bond multiple for an aggregated wireless bonded link. Previous bonding methodologies resided at lower OSI layers, requiring coordination with for implementation. Broadband bonding, because it is implemented at higher layers, can be done without this coordination.

Commercial implementations of Broadband Channel Bonding include:. Mushroom Networks' Broadband Bonding Service. Connectify's Speedify fast bonding VPN - software app for multiple platforms: PC, Mac, iOS and Android. Peplink's SpeedFusion Bonding Technology. Viprinet's Multichannel VPN Bonding Technology. Elsight's Multichannel Secure Data Link See also: Wi-Fi. Further information on channel bonding:.

On (Wi-Fi), channel bonding is used in technology, referred as 108Mbit/s. It bonds two channels of standard, which has 54Mbit/s. On, a mode with a channel width of 40 MHz is specified. This is not channel bonding, but a single channel with double the older 20 MHz channel width, thus using two adjacent 20 MHz bands. This allows direct doubling of the PHY data rate from a single 20 MHz channel, but the MAC and user level throughput also depends on other factors so may not double. See also. References.

^ Guijarro, Manuel; Ruben Gaspar; et al. Conference Series. IOP Publishing. 119 (4): 042015.:. Retrieved 2009-08-17. Network bonding (also known as port trunking) consists of aggregating multiple network interfaces into a single logical bonded interface that correspond to a single IP address. From the original on 2012-04-19.

Retrieved 2012-03-15. From the original on 2013-12-07. Retrieved 2013-08-13.

From the original on 27 October 2017. Retrieved 9 May 2018. Law, David (2006-11-13). (PDF) from the original on 2008-10-07.

Retrieved 2009-08-18. Proposal to move Link Aggregation to IEEE 802.1.It is an 802.3 sublayer but it has to go above IEEE Std 802.1x. (PDF). (PDF) from the original on 2010-11-16. It has been concluded between 802.1 and 802.3 that future development of Link Aggregation would be more appropriate as an 802.1 standard. From the original on 2013-08-07. Retrieved 2013-08-13.

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Archived from (PDF) on 13 March 2012. From the original on 28 June 2016. Retrieved 9 May 2018. ^ 2010-12-28 at the. From the original on 14 September 2017.

Internet Lag Switch For Mac

Retrieved 9 May 2018. (PDF) from the original on 2007-11-29. Retrieved 2007-05-14.

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Lag Switch Software Mac

VMware 2014-01-23 at the., June, 2012. Visited 17 January 2013. Jielin Dong, ed. ITPro collection. Javvin Technologies Inc.

Retrieved 2013-08-07. Channel bonding, sometimes also called redundant array of independent network interfaces (RAIN), is an arrangement in which two or more network interfaces on a host computer are combined for redundancy or increased throughput. Archived from on 7 July 2012. Retrieved 5 April 2013. General.