Lag refers to slower response time (or latency), and to delays experienced in computing, communications, and engineering.
Starting in Junos OS Release 15.1X49-D80, Link Aggregation Control Protocol (LACP) is supported in Layer 2 transparent mode in addition to existing support in Layer 3 mode for SRX300, SRX320, SRX340, SRX345, SRX1500, SRX4100, SRX4200 devices and vSRX instances.
An MC-LAG provides redundancy and load balancing between the two MC-LAG peers, multihoming support, and a loop-free Layer 2 network without running STP. LACP is used to discover multiple links from a client device connected to an MC-LAG peer. LACP must be configured on both MC-LAG peers for an MC-LAG to work correctly.
A: LACP/Port channel allows multiple ports to be bundled between the controller and the uplink switch. However, the maximum throughput between any two devices behind each end of the port channel will not exceed the link speed of the physical port in the path.
Link Aggregation Control Protocol (LACP) is part of the IEEE specification (802.3az) that enables you to bundle several physical ports together to form a single logical channel (LAG). LAGs multiply the bandwidth, increase port flexibility, and provide link redundancy between two devices.
The LACP provides a standard negotiation mechanism for a switching device so that the switching device can automatically form and start the aggregated link according to its configuration. After the aggregated link is formed, LACP is responsible for maintaining the link status.
Port mirroring is used on a network switch to send a copy of network packets seen on one switch port (or an entire VLAN) to a network monitoring connection on another switch port. It helps administrators keep a close eye on network performance and alerts them when problems occur.
A lag switch is a piece of equipment installed on a home network that temporarily delays the flow of traffic to the internet. In an online gaming context, the physical toggle can be switched on to delay gameplay to give the lag switcher the upper hand.
Adding an NIC increases available bandwidthWell, in the case of NIC Teaming, network traffic is balanced across all active NICs, providing the ability to double your available bandwidth or more depending on the number of NICs in your server.
How does STP prevent loops? Because the “best ports” are put into forwarding state and the other ports are put into blocking state, there are no loops in the network. When a new switch is introduced to the network, the algorithm and port states are recalculated to prevent a new loop.
Port Trunking, also known as LACP (Link Aggregation Control Protocol), allows you to combine multiple LAN interfaces for increased bandwidth and load balancing for multiple clients. It also provides failover capabilities to maintain network connectivity if a network port fails.
NIC Teaming allows you to group between one and 32 physical Ethernet network adapters into one or more software-based virtual network adapters. These virtual network adapters provide fast performance and fault tolerance in the event of a network adapter failure.
NIC Teaming and NIC bonding are two different things. NIC Teaming uses one of two methods, failover, and load-balancing with fail over. With a team you do not get a single 2gb connection (with two 1 gb NICs). True bonding would be taking two NICs and bonding them together to get a single fat pipe.
Active mode—the interface is in an active negotiating state. The port in a passive mode responds to negotiations requests from other ports that are in an active mode. Ports in passive mode respond to LACP packets. A port in a passive mode cannot set up a port channel (LAG group) with another port in a passive mode.
Complete the following steps to create a LAG.
- Enter the global configuration mode. device# configure terminal.
- Configure a LAG. You can configure any of the following LAG types: static LAG, dynamic LAG, or keep-alive LAG.
- Add ports to the LAG. The following example shows configuration of a static LAG with two ports.
Link Trap The link trap mode of the port channel. When enabled, a trap is sent to any configured SNMP receiver(s) when the link state of the port channel changes. Members The ports that are members of a port channel. Each port channel can have a maximum of 8 member ports.
Port labels are names given to sets of port numbers. You use port labels when configuring in-path rules in place of individual port numbers. For example, you can use port labels to define a set of ports for which the same in-path, peering, QoS classification, and QoS marking rules apply.
LACP Load Balance AlgorithmStandard mode of load balancing packets across LACP EtherChannel if per flow so each flow will always get one of the bundled links to get to the other side. On some switches, you can even change the load balancing so that it works per packet and not per flow, but that is not best practice.
Each device that runs LACP has an LACP system priority value. You can configure a value between 1 and 65535. LACP uses the system priority with the MAC address to form the system ID and also during negotiation with other systems. When setting the priority, note that a higher number means a lower priority.
It decreases the amount of configuration that is needed on a switch. It provides a simulated environment for testing link aggregation. It allows the use of multivendor devices. LACP allows Fast Ethernet and Gigabit Ethernet interfaces to be mixed within a single EtherChannel.
EtherChannel vs.EtherChannel and IEEE 802.3ad standards are very similar and accomplish the same goal. EtherChannel supports both LACP and Cisco's PAgP, whereas 802.3ad uses LACP. LACP allows for up to 8 active and 8 standby links, whereas PAgP only allows for 8 active links.
LACP key—The LACP key defines the ability of a port to aggregate with other ports. You must configure a key on each port running LACP. When 2 or more ports with the same key are configured, a LACP Etherchannel is established. The maximum recommended key value is 4, indicating the maximum channel groups.
Dynamic: It established dynamically using the negotiation outlined in the LACP standard. b. Requirement for LACP i. All links must operate in full-duplex mode. All links must be the same speed and media type 2.
