13 votes
Accepted

LACP rate slow vs fast... impact on bandwidth?

An LACP PDU is around 110 bytes, so running them every second isn't likely to even register on an Ethernet link of any speed. I would recommend running in "fast" mode at all times for rapid detection ...
9 votes
Accepted

Do LACP MTUs (or other link-level MTUs) need to match?

Does setting a custom MTU on the host side of a LACP bond require also customizing the MTU on the switch side? Your data-link MTUs: On servers the data-link should always match between servers ...
8 votes
Accepted

EtherChannel and odd number of ports

The power of 2 requirement varies per vendor/hardware/software. Cisco had (has) a pretty bad stigma against them with a lot of the earlier catalyst switches capable of 10G. The problem comes with ...
  • 6,480
7 votes
Accepted

Using channel-group mode on in my full Cisco enviroment

LACP gives you a significant advantage in that it verifies connectivity in both directions over each link. You can think of it as also combining the features of UDLD with link aggregation. For ...
  • 613
6 votes
Accepted

Bond switch uplinks together for double bandwidth between switches

Yes, if I am reading things correctly it appears your understanding is correct. Yes, there are implementations that will allow you to do link aggregation between a host and two switches. Switch ...
  • 26.9k
6 votes
Accepted

LACP and how to configure switches correctly

Your ethernet SFP/SFP+ for fiber are going to be 1 or 10 Gbps. There isn't a 2 Gbps ethernet fiber SFP (some vendors used to count this way because of full duplex, but it is still 1 Gbps in each ...
  • 95.9k
6 votes

Best way to connect VLANs / STP / LAG

VLANs are a way of partitioning a given network into distinct layer 2 segments as if you'd be using separate switches, so you don't have your whole network bunched together. The advantage of VLANs ...
  • 75.7k
6 votes
Accepted

Network Redundancy with LACP Trunking

Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into Switch 2 ports 1+2. Both links will be used, but a single flow will only use one link. There is a hashing ...
  • 95.9k
6 votes

Capturing LACP PDUs in an aggregated link on Juniper MX

show lacp interfaces <aeX> displays detailed state information for each member-link in a LAG. For example: user@router> show lacp interfaces ae0 extensive LACP state: Role Exp Def ...
  • 5,344
5 votes
Accepted

Can I use 802.1x and LACP to secure the networking infrastructure?

802.1x was specifically designed for end-point devices to authenticate to network switches and was not designed for switch-to-switch connections. Because of this, it is highly unlikely that you will ...
5 votes
Accepted

Bridge Assurance with vPC on port type network

Spanning-tree port type network activates bridge assurance on the link. Since the 2960X doesn't support bridge assurance, you can't run this link as port type network. Just run it in normal mode. ...
  • 66
5 votes
Accepted

LACP: Between RB750 and Huawei Ne20

Not sure what you tested. You need to aware that any single flow will only use one of the port combinations each way. Port aggregation allows you to increase the throughput for multiple flows, not for ...
  • 75.7k
5 votes
Accepted

LACP Huawei S6720

Static LAG trunks are just that: static. When multiple interfaces are connected they are regarded as a single logical port. LACP trunks are negotiated by protocol. That way you can ensure that they ...
  • 75.7k
5 votes

Layer3 vs Layer2 LACP

The choice between using a L2 or L3 link is really independent of LACP. Assuming your LACP hashing algorithm choice uses layer 3 information to choose the link (and your ISP does the same), there is ...
  • 64.3k
4 votes

HP Switching, DT Links to two STP switches?

This isn't Distributed Trunking. The described topology is: .-------. .-------. | | | | | 8200A |--| 8200B | | | | | '-------' '-------' | | | | ....
4 votes
Accepted

Port Group Cisco 2960X + HyperV or any server

first of all you need to know that using port channel mean you will maximum obtain one physical link speed (1G) per flow where flow means same source port and same destination port, so if you generate ...
  • 3,434
4 votes

Port Group Cisco 2960X + HyperV or any server

Link aggregation / port-channel / lacp will not allow you to have a single stream to use several interfaces. Four different streams can use different physical interfaces, and each one could use 1Gbs (...
  • 18.8k
4 votes
Accepted

Server link bond across 2 switches with LACP, inter-switch LAG dropping alternate pings?

This problem happens because Linux bonding in 802.3ad mode sets all slave interfaces to the same hardware mac address ("borrowed" from the first enslaved interface). Then LACP PDUs are transmitted ...
4 votes
Accepted

LACP to Fix Switch Bottleneck?

The setup is totally valid, provided all devices support LACP LAG. Two things though: The network design is not very good, neither for reliability nor from the performance/efficiency perspective. ...
  • 75.7k
4 votes
Accepted

what will change in a trunk between lacp mode and trunk mode?

LACP is a protocol where both side negotiate the trunk - if either side doesn't use LACP both (all) links will stay separate. STP may step in and prevent a bridge loop. A static trunk uses no ...
  • 75.7k
4 votes

Network Redundancy with LACP Trunking

From a functional point of view, there's no difference between LACP trunks and static trunks. All links are aggregated (with the limitations Ron has already pointed out) and the aggregation group is ...
  • 75.7k
4 votes

Inconsistent behavior of link aggregation

It depends on the LACP load balancing algorithm. The LACP load balancing algorithm is only locally significant (they don't have to match on Mellanox and Arista switch). Load balancing algorithms are ...
  • 108
3 votes

Force10 port channel to server that also supports PXE boot

@Matthew you are on the right way. I have faced this exact problem in the past and I have used this command in S4810 devices. Unfortunately, I suspect this command is not supported in all Force10 ...
  • 1,152
3 votes

Juniper trunking with two links (not using LAG)

RSTP - configure both links the same. Ensure that RSTP is enabled on both sides of the link via 'set protocols rstp interface xe-blah' or just ensure 'set protocol rstp interface all' is configured. ...
  • 834
3 votes
Accepted

Juniper trunking with two links (not using LAG)

One thing to keep in mind with trunk redundancy is that STP fails over slowly, even with Rapid STP. If you set up the two links as an aggregated channel, the link failover is much faster. STP ...
  • 95.9k
3 votes

Does "lacp port-priority" not work on Cisco Catalyst 3750 series?

This looks normal to me. I think you may have a misunderstanding about the nature of this command. This should help, from Cisco documentation: The lacp port-priority interface configuration ...
  • 26.9k
3 votes

EtherChannel and odd number of ports

Is the requirement of 2n number of ports for EtherChannel a critical requirement or just a recommendation to ensure, perhaps, an even load balancing? Most vendors don't have such a requirement. ...
  • 26.9k
3 votes
Accepted

Why does the host in VLAN X flap between ports if LACP is configured?

If the port channel is DOWN, then the Cisco device doesn't see it bundled together. As your display shows, each port are Stand-Alone (as indicated by the "I" status), meaning they're seen as separate ...

Only top scored, non community-wiki answers of a minimum length are eligible