Questions tagged [lacp]

LACP, or Link Aggregation Control Protocol, is a standard defined by IEEE 802.3ad for bundling or bonding multiple physical network ports together into one virtual device. This provides both high availability and load balancing. Participants in an LACP aggregation actively communicate with each other using LACPDUs every 1 second or 30 second to maintain knowledge of the bond configuration.

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How exactly & specifically does layer 3 LACP destination address hashing work?

Based on an earlier question over a year ago (Multiplexed 1 Gbps Ethernet?), I went off and setup a new rack with a new ISP with LACP links all over the place. We need this because we have individual ...
Stu Thompson's user avatar
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14 votes
2 answers
4k views

VMware Distributed vSwitches (VDS) - Design, theory, *real* use cases and examples?

I'm starting to explore VMware Distributed Switches (dvSwitches or VDS) for use in existing and new installations. Assume VMware version 5.1 and newer with Enterprise Plus licensing. Prior to this, I'...
ewwhite's user avatar
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12 votes
3 answers
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Link aggregation (LACP/802.3ad) max throughput

I'm seeing some confusing behaviour regarding bonded interfaces under Linux and I'd like to throw the situation out there in hopes that someone can clear it up for me. I have two servers: Server 1 (...
Zetten's user avatar
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11 votes
6 answers
51k views

Does a single LACP channel over multiple switches increase redundancy?

I am curious for opinions, findings, or evidence that having multiple interfaces bonded using LACP to ports in multiple switches can increase redundancy. Previously bonded interfaces have always been ...
Sirch's user avatar
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11 votes
1 answer
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FreeBSD link aggregation no faster than single link

We put a 4 port Intel I340-T4 NIC in a FreeBSD 9.3 server1 and configured it for link aggregation in LACP mode in an attempt to decrease the time it takes to mirror 8 to 16 TiB of data from a master ...
Warren Young's user avatar
9 votes
4 answers
78k views

Can bonding 2 interfaces double the speed?

I have 2 linux boxes running centos 6.5 each with 2 interfaces bonded together, linked to a Cisco 2960-S switch with lacp configured ports. The configuration on the switch port-channel load-balance ...
Ammar Lakis's user avatar
9 votes
3 answers
23k views

Does linux balance-rr (bond mode=0) work with all switches?

I'm configuring two ethernet interfaces into an aggregation group to double bandwidth, and I was wondering if bond mode=0 works for all switches? What about dumb switches that don't support LACP? Will ...
ensnare's user avatar
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9 votes
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How does one diagnose Linux LACP issues at the kernel level?

Is there an underlying administrative or diagnostic interface to the Linux bonding driver to determine what is going on internally? I've used link aggregation between Linux boxes and Cisco switches ...
jjoganic's user avatar
9 votes
1 answer
2k views

iSCSI design options for 10GbE VMware distributed switches? MPIO vs. LACP

I'm working on expanding the storage backend for several VMware vSphere 5.5 and 6.0 clusters at my datacenter. I've primarily used NFS datastores throughout my VMware experience (Solaris ZFS, Isilon, ...
ewwhite's user avatar
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8 votes
1 answer
12k views

Layer 2 Loop Avoidance: Three Switches in Series

I know this seems like a homework question, but it's actually part of a larger project (and network) and need to break it down into chunks so I'm clear with what I'm doing. I've never worked with [R/...
WuckaChucka's user avatar
6 votes
4 answers
45k views

Linux bonding: 802.3ad (LACP) vs. balance-alb mode

Here's the situation. I would like to connect my Linux servers to a single network using dual link for fault tolerance and load balancing reasons. The servers have 2 or more 1-gig NICs and I plan to ...
sagi's user avatar
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6 votes
3 answers
15k views

How do I test the increased bandwidth after setting up LACP?

I have setup LACP, and LAG on our Netgear Switches (GS724T). I have bound(?) two ports together to create one 2Gbps connection between two of the switches. I was wondering if there is a way of ...
dannymcc's user avatar
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6 votes
3 answers
21k views

Best way to provide redundant switching/links to server

We have 3x ESX hosts and 2x SANS that we wish to move to a redundant 10G networking infrastructure. We have 4x Dell PowerConnect 8024F's to provide our backbone and are configured as so (only core ...
mylesagray's user avatar
6 votes
1 answer
14k views

bond slave interfaces not getting the same aggregator id on LACP

I have a bug on some servers where LACP (802.3ad) is not working. I have on all servers a bonding device bond0 with two eth slaves and each interface is plugged on a different swich, and both switches ...
Baptiste Mille-Mathias's user avatar
6 votes
2 answers
15k views

LACP with 2 NICs working when either one is down, not when both are up

I'm running into problems with getting a LACP trunk to operate properly on Ubuntu 12.04.2 LTS. My setup is a single host connected with two 10 Gbe interfaces to two seperate Nexus 5548 switches, with ...
Tolli's user avatar
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6 votes
2 answers
5k views

Fault Tolerance with 2 HP ProCurve 2824 Switches

Looking for some advice on our current situation. We have a full rack at a data center that contains 1 uplink to the data center distribution layer switch (we don't control this), 2 HP ProCurve 2824's ...
aj4525's user avatar
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5 votes
1 answer
4k views

LACP NFS performance confusion

Background Info: So I have an Ubuntu 14.04 server (1 gigabit nic) and a NAS (Synology DS1815+, 4 gigabit nics). I am maxing out the gigabit line between by Ubuntu 14.04 server and my network ...
Alec Fenichel's user avatar
5 votes
2 answers
6k views

LACP vs 802.3ad

I’m looking to create an aggregation on a Solaris box using dladm. I understand that once the aggregation is created, 802.3ad will be used to balance the load depending on the policy (L2, L3 or L4). ...
Chimpsky's user avatar
5 votes
1 answer
4k views

systemd doesn't unmount NFS shares before stopping network

Context : RHEL 7.2 up to day as for October 2016 Physical system NetworkManager disabled Network configured through the teaming of 2x10G NICs (eth0 & eth1) as lacp0 (irrelevant) IP addresses are ...
mveroone's user avatar
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4 votes
2 answers
792 views

Do you trust LACP?

Are there any reasons why I should not rely on LACP when designing network topology? I exactly mean L2 switch to hypervisor connection, so it is the place where agregated traffic of VMs cumulates. We ...
Andy Coarse's user avatar
4 votes
1 answer
1k views

VM transfer speed between XCP-ng (XEN) servers

I have two HP DL380 G8 servers with 4x 1TB on HP p420 RAID controllers in RAID 1+0 setup. Eth0s are connected to the router, and Eth3&Eth4s are bonded (LACP) and connected directly between ...
Sakvojage's user avatar
4 votes
1 answer
1k views

High availability links on VMware ESXi

I have a cluster of 3 VMware ESXi6.0 hosts which are not licensed for VMware Distributed Switch. Currently, these hosts are configured with a static LAG between 2 ports on the server and a port each ...
Daniel Arkley's user avatar
4 votes
1 answer
624 views

What happens to active TCP sessions when the active slave fails in a Linux bond (failove or LACP)?

Given an active-backup (mode 3) or 802.3ad (mode 4) type bond, when the active slave fails, is there any seamless failover for those TCP/IP connections that were active prior to and at the time of the ...
adtgdc's user avatar
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4 votes
1 answer
835 views

Is is possible to put a tagged vlan on one physical interface on a Force10 S50N switch?

I servers that have a shared ethernet port for IPMI and the first NIC. They have 4-1GbE nics. I would like to bond the nics via LACP while still being able to access the IPMI over a tagged vlan only ...
Wren T.'s user avatar
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3 votes
3 answers
7k views

NIC teaming and EtherChannel

Cisco Catalyst 2960S Switch Intel Dual Port NIC (teamed) BroadComm Quad Port NIC (teamed 2 ports) We hired a contractor to setup a fairly simple SQL cluster and SAN storage. With the above switch ...
EkoostikMartin's user avatar
3 votes
4 answers
12k views

Linux bond mode 802.3ad not activated

on a server running Debian Stretch I configured a bond0 with the 802.3ad mode as following: auto bond0 iface bond0 inet manual slaves eth0 eth2 bond_miimon 100 bond_mode 802....
Mat's user avatar
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3 votes
1 answer
3k views

HP Procurve Core Switch Architecture

I want to build a new 'core' for our network. We currently have a 3com 4060 switch acting as the core, connecting all the other TOR and access switches together. The goal is to add resilience into ...
fukawi2's user avatar
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3 votes
1 answer
2k views

LACP Throughput Issues

I have been struggling with an LACP implementation for a while now, and the number of variables has really been getting overwhelming. Right now the setup I have is two hosts running 2008R2, each of ...
user124712's user avatar
3 votes
3 answers
2k views

Win2012R2 NIC Teaming with LACP, but one nic has not traffic

I want have 2Gbps bandwidth (peer to peer) with 2 1Gbps NIC. It's on HP MicroServer Gen8, 2 on board NICs. I have bind 2 NIC teaming with LACP, dynamic load balance, but one interface has large ...
user219031's user avatar
3 votes
2 answers
2k views

Bonded Gigabit Interfaces capped at ~500mbps each

This issue has been driving me nutty for days now! I recently bonded the eth0/eth1 interfaces on a few linux servers into bond1 with the following configs(same on all systems): DEVICE=bond0 ONBOOT=...
Jeremy's user avatar
  • 31
3 votes
2 answers
3k views

Increase data transfer speed through bonding/lacp?

I want to maximize the throughput of a data transfer between two servers. The copy will be made at the application layer using Robocopy. To clear things up, please check my Visio schema of the ...
Delta's user avatar
  • 189
3 votes
2 answers
5k views

can switch handle multiple LACP teams on the same ports

If I use SRIOV capable adapter for virtualization, and setup 2 different LACP links in 2 guests, so there may be 2 LACP links on the same ports on switch side, can switch handle this case? For ...
jerome's user avatar
  • 31
3 votes
2 answers
2k views

Could it be that no link detected until bond configured?

Could it be that the: ethtool ethx | grep detected shows "no link detected" if the bond0 isn't configured yet on OS (linux) side? isn't ethtool showing a physical state?
Hessnov's user avatar
  • 143
3 votes
1 answer
9k views

Debian LACP Bond eth0 Churning state

I have setup a LACP Bond on 2 x 1Gbps connections on a HP server running Debian 8.x, previously done this configuration on CentOS 7.x with no issues at all. The issue I am facing is eth0 a minute ...
Ashley Merrick's user avatar
3 votes
1 answer
673 views

LACP with VMWare 5.1 Distributed Switches (VDS) over multiple hosts.. How many switch LACP groups?

I'm setting up a 2-host VMWare 5.1 Cluster to use a vDS (Virtual Distributed Switch) with LACP enabled, over 4 NICs (2 per host). In times past, when I've used VMWare Standard Switches with Static ...
Crispin Bivans's user avatar
3 votes
1 answer
14k views

LACP 802.3ad load balancing (bonding) on Ubuntu 18.04 not balancing evenly

I upgraded to Ubuntu 18.04 and the new Netplan configuration, but my (2) network cards stopped sharing the load evenly. In my network configuration, I have many connections to many different servers; ...
ensnare's user avatar
  • 2,232
2 votes
2 answers
15k views

Linux Centos6 adapter bonding - Cisco 2960S EtherChannel LACP

I want to connect a CentOS 6.4 Linux Box with two NICs to a Cisco 2960S using LACP 802.3ad port aggregation. This mainly for redundancy reasons (and hopefully more bandwith). We don't use VLAN tagging....
StackUnderflow's user avatar
2 votes
1 answer
4k views

Load balancing multiple NICs on single machine presenting a virtual IP

I've inherited a network setup, where the NFS/Samba linux RAID server ("Ubuntu 14.04.5 LTS") is serving everything over one NIC. As a result, the 1Gb network bandwidth is saturated. Unfortunately, ...
BurningKrome's user avatar
2 votes
2 answers
1k views

Does LACP routing type have to be the same on all ends?

i was wondering if the routing mechanism for LACP (source / destination MAC, source+destination MAC, source / destination IP, source+destination IP) has to be the same within one LACP trunk* between ...
omni's user avatar
  • 333
2 votes
1 answer
708 views

LACP Total Speed

If we were to connect two switches together using LACP (with 2 X 1Gbe ports on each side), does this mean that the max speed that a single MAC address will ever reach is 1Gb? So for example, if a ...
jtnire's user avatar
  • 817
2 votes
1 answer
395 views

Link aggregation on ESXi

I have a VM fileserver, Windows 2012R2, installed on an ESXi 6.0U3 (free version) and would like to increase the network width by adding one more NIC and using link aggreagation. Previously this ...
Marcelo Magalhães's user avatar
2 votes
2 answers
4k views

NIC Team not achieving full Throughput

I'm trying to achieve 4Gbps throughput between my computer and my Synology Nas. Unfortunately I am only getting 1Gbps speeds between these systems. My setup is below: Synology DS1515+ with 4 NICS ...
Jaxian's user avatar
  • 169
2 votes
1 answer
3k views

Link Aggregation with 3 switches

I am new in networking. Sorry for my ignorance. I have three switches. Switch 1 has 4 ports. Two of them connected to switch 2. And the other two ports are connected to switch 3. All these four ...
ysnfrk's user avatar
  • 23
2 votes
1 answer
191 views

Cisco switches LACP, lost connections

I just put up a LACP between two Cisco SG-200 switches. Unfortunately some PCs connected to these switches got problems like lost Postgres connections etc. My configuration is simple: ---------------- ...
Knowledge's user avatar
2 votes
0 answers
102 views

port channel delay coming up <> linux config

after our 5k switch reboots, due to many configured vlans, LACP/port channels take some time to come up. seems to be a serial process, and if vlans are at bottom of this list, it takes some time - ...
chimcentral's user avatar
2 votes
0 answers
1k views

Debian LACP bond not working well?

I am configured ifenslave LACP on my Debian 8.5. Two ports connected to a Cisco SLM2024 switch. If I disconnect 1 link, everything is ok, the another link working. But when I reconnect the 1st link, ...
ianlot's user avatar
  • 21
2 votes
1 answer
159 views

OEL 7.2 with LACP systemd shutdowns networking before umounting _netdev filesystems

I've built an NFS cluster with OCFS2 as a backing filesystem. This is working quite well with the exception of when a node is restarted/shutdown cleanly it causes a fence operation as network is ...
stuntkiwi's user avatar
2 votes
0 answers
1k views

What is the purpose of a "static LACP" trunk group on HP switches?

I'm in the process of educating myself regarding configuring aggregated links on HP ProCurve switches. Looking at non-vendor-specific documentation regarding link aggregation, the defining ...
dbr's user avatar
  • 1,862
2 votes
0 answers
998 views

Lacp over two linux boxes - something like MC-LAG

I have two linux box'es which are gateways for some kind of virtualized network (Openvswitch, GRE). I am trying to optimize performance - so I decided, that I have to try remove routing part from them ...
Krzysiek's user avatar
2 votes
0 answers
2k views

Configuring LACP between OpenIndiana (Solaris) and a Cisco C3560

I am running OpenIndiana (oi_151a8) and have two NICs aggregated using LACP connected to a Cisco WS-C3560G-48TS. Both the server and the switch show the aggregate link as up. But while link layer ...
user189271's user avatar