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Questions tagged [ieee-802.1ax]

For questions about Link Aggregation Control Protocol (LACP); IEEE 802.1AX.

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Set promiscuous port for upstream LACP trunk on Cisco 2960X

I have a series of clients who are looking into a intra-VLAN isolation scheme to satisfy a DDQ request. I was looking into deploying private VLANs for all client device / voice VLANs to satisfy this ...
Moridn's user avatar
  • 11
1 vote
1 answer
116 views

ASA5555-X vlans through port channel not working

I'm havin a problem with my ASA when trying to pass vlans through port channel to a switch. The goal being here that all vlans that we have would go through a single port channel (4 1Gb links for load ...
The amateur programmer's user avatar
1 vote
1 answer
75 views

How to connect multiple ports as a single connection (Arista 7050sx3-48yc8 to HP Aruba 5412Rzl2 Backbone)

Environment: Arista 7050sx3-48yc8 (two units) HP Aruba 5412Rzl2 (backbone) the backbone has an 8 port 10g module (two modules: 8x2=16 ports) the sfps on arista and hp side are all 10g We have an HP ...
shafuq's user avatar
  • 137
2 votes
2 answers
732 views

Can LACP connect to 2 different firewalls?

I'm in the process of redesigning my network and have a few questions about LACP configuration: Can LACP be set up to connect to two different firewalls? In the diagram I provided, there are three ...
kevin's user avatar
  • 23
0 votes
1 answer
677 views

Cisco Nexus vPC Portchannel issues

I'm currently facing a network issue between Cisco Nexus 93108 (9.3.11) on an LACP port-channel configuration. The replica below help us to reproduce the issue we had (using 4x Nexus 9000v qcow2 image ...
motorbass's user avatar
  • 101
5 votes
2 answers
1k views

Two switches, double connection, no LACP: how does it work?

We have a network with an HP 1910-24 and a V1410-16 (unmanaged). The two are connected via two network cables, but there's no Link Aggregation configured on the 1910, and all the connections are ...
Maxxer's user avatar
  • 153
1 vote
1 answer
69 views

802.11ax and non 802.11ax AP on the same channel

What issues can cause 802.11ax AP that work on the same 2.4GHz channel with, for example, 802.11n AP with different BSSID? Is it worse than two 802.11n APs on the same channel with different BSSID?
Kamil Zaripov's user avatar
0 votes
1 answer
402 views

Inconsistent behavior of link aggregation

I'm testing bandwidth between two switches and I noticed link aggregation behaves inconsistently between test runs. I'm testing with a single instance of iperf with 2 streams. Sometimes the load is ...
Elliott B's user avatar
  • 101
1 vote
1 answer
491 views

802.1X needs 802.1AE more than 802.1, 802.3 does, true?

In some networks basics course the statement was made by lecturer 802.1AE was the extension developed and implemented due to shortages of 802.1X. No references were made, at this point, to the ...
AtNarrow's user avatar
0 votes
1 answer
79 views

Is it risky to change hardcoded STP mLAG port cost on Cisco Nexus LACP port

When two Cisco Nexus are connected in VPC, the stp cost is hardcoded to 200 for the mLAG LACP ports. I would like to manually change the cost on my devices because my 2G and 200G links have the same ...
setenforce 1's user avatar
0 votes
1 answer
9k views

Port suspended (No LACP PDUs) nx 9k switch -> C220 m5 ucs

We are setting up 2 nx 9k switches with port channel (LACP) enabled so we can have multiple links for redundancy. The two links in questions is eth1/3 on both switches going to UCS MLOM ports. We are ...
Alexander The Great's user avatar
0 votes
0 answers
119 views

Wifi 802.11ac dynamic channel width negotiation

Let's assume that AP1 is on channel 40 width 80mhz, AP2 is on channel 48 width 80mhz, It overlaps. As far as i understand 802.11ac has a functionality which detects width utilization per-frame and ...
Suttwells's user avatar
-1 votes
1 answer
1k views

HP 6120XG switch LACP is blocked - error condition

Folks, I am dealing with very strange issue related LACP and not sure if its bug of 6120XG switch or something else. so let me explain my issue here. Network Diagram: I have two Cisco Nexus 9396PX ...
Satish's user avatar
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1 vote
0 answers
62 views

Pros and cons of directly interconnecting routers and firewalls vs via switch in an enterprise-network? [closed]

In a medium-sized enterprise network, let's say you have a pair of datacenter switches, a pair of distribution switches, a pair of internal core routers, a pair of firewalls, and a pair of edge ...
Steve Osmond's user avatar
0 votes
1 answer
397 views

Juniper MX204 to Juniper EX4300 redundant fiber links with load balancing

I have a scenario where I have an EX4300 that needs to have redundant links to an MX204 router. My initial thought was to setup LAG with LACP, but I am wondering if this is possible or not. I couldn't ...
Ben's user avatar
  • 157
2 votes
3 answers
1k views

How can you determine the result of a load-balancing hashing algorithm (such as ECMP/LAG) for troubleshooting?

In many architectures there are load-balancing mechanisms such as ECMP routing or LAG between various interfaces. This load-balancing is usually per-flow, based on a hash of various criteria, such as ...
Duke Rusty's user avatar
0 votes
1 answer
979 views

Connecting two Stacked Aruba 2930M Switch with third one using LACP

In the skit, I would like to connect the two Stacked switches with a third one using the SFPs+ Modules and therefore I need to configure the LACP for them. How can I configure the LACP on both the ...
Kikomi's user avatar
  • 27
4 votes
2 answers
2k views

Capturing LACP PDUs in an aggregated link on Juniper MX

We need to capture LACP PDUs on a member link of an aggregated bundle link on Juniper MX connected with other router via DWDM link and save the output in .pcap format using write-file knob. Can ...
Nabeel's user avatar
  • 1,120
0 votes
1 answer
59 views

802.11s Operations

I am in the process of specifying a set of upgrades to allow 802.11ax roaming in a campus consisting of several large warehouses. Right now, the network consists of 802.11g access points with very ...
Tripp Kinetics's user avatar
1 vote
2 answers
195 views

Query regarding LACP System Priority

This is regarding LACP System Priority. From my research I could find the following info pertaining to system priority. LACP combines the System Priority value with the MAC address of the switch to ...
Neil Roy's user avatar
0 votes
1 answer
256 views

Query regarding LACP timeout flag

Say we have two swicthes. Switch A and Switch B. Switch A sends LACPDU's with timeput flag set to 1 (fast). Switch B sends LACPDU's with timeout flag set to 0 (slow). By researching came to know that ...
Neil Roy's user avatar
1 vote
2 answers
850 views

Criteria to match for lacp status to come up

I did research and found that below are the minimum requirements for LACP to be Up. One of the side should be active. All the port speed should be same. Duplex settings need to be same. Also I have ...
Neil Roy's user avatar
0 votes
1 answer
539 views

When creating a LAG, what VLAN conditions should be satisfied?

There are two interfaces which are to be added in a LAG. The attributes which should be same are speeds and MTU values. What about physical interfaces which are in different VLANs. For example, Port 1 ...
Rahul Shakya's user avatar
2 votes
1 answer
1k views

How to capture mixture of packets with and without VLAN tag over LACP with tcpdump?

Given following configuration in Linux: bond0 in LACP (802.3ad) mode with two VLAN networks running over it. bond0.111 configured with static IP bond0.222 configured with DHCP How to capture packets ...
Mikko Rantalainen's user avatar
0 votes
0 answers
22 views

How does Link Aggregation actually increases bandwidth? [duplicate]

For example, if we need 450 Mbps of bandwidth to transmit data and have only a 100-Mbps Fast Ethernet ports, we can create a LAG bundle containing five 100-Mbps Fast Ethernet ports. But I also read ...
Rahul Shakya's user avatar
1 vote
1 answer
408 views

using 802.1x with nic teaming

I am working on a project which is mandatory to have each pc configured with two network interface cards as a nic team. I want to use 802.1x for authentication with a radius server like cisco ISE. My ...
665bassem's user avatar
3 votes
1 answer
881 views

HPE IRF Stack why do I need two physical ports?

I'm building exactly the same topology, but there is no explanation why do I need two physical interfaces in IRF stack? So, can someone please explain me, why do I need two physical members in IRF ...
xxx's user avatar
  • 31
4 votes
1 answer
5k views

Can I aggregate multiple uplink ports between Ethernet switches?

Disclaimer: I'm not a network engineer; I just have to try to do a good-enough impression to solve this problem. We have two rooms in our office. In the first, I would like to put a large copper 10-...
Jason R's user avatar
  • 185
1 vote
1 answer
750 views

How can I configure link aggregation/bonded LAN for my simple Ubuntu router build? [closed]

I'm spinning out on this one...! Someone please help! I followed this fab tutorial below to make my own Ubuntu based router: How to build a simple router Ubuntu Server 18.04 Which works great using ...
slughead311's user avatar
4 votes
2 answers
3k views

Network Redundancy with LACP Trunking

I would like to set up a redundant link between two switches. I have four ports available to accomplish this. Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
jbakerj's user avatar
  • 53
3 votes
2 answers
916 views

Spine and Leaf architecture with LACP

In a spine and leaf architecture with Link Aggregation between spine and leaves (active-active) like this: Do we have the same active-atcive link aggregation between the leaf and the server? Is the ...
leonardo's user avatar
1 vote
1 answer
2k views

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

I need to link two HP switch with multiple port for throughput purpose. they are different models but same generation. I could use either trunk 37-40 trk1 lacp or otherwise trunk 37-40 trk1 trunk on ...
dominix's user avatar
  • 195
1 vote
1 answer
175 views

LACP to Fix Switch Bottleneck?

I have a bottleneck affecting traffic. There are 4 switches with each of them running a line to the next to provide internet. I haven't played around with LACP LAG too much and am wondering if the ...
Paradox1911's user avatar
4 votes
2 answers
8k views

Layer3 vs Layer2 LACP

We have ISP link 4x10G LACP Layer2 and now we are upgrade to to 8x10G LACP, currently i have created VLAN interface to terminate that link because it L2 Now i have option to decide to go with L3 or ...
Satish's user avatar
  • 4,379
3 votes
1 answer
817 views

LAG - MAC address, IP address, VLAN assignment

I want to ask some questions related to Link Aggregation Group - LAG: Can LAG be configured in Active Standby Mode? Or can LAG only be used in the standard operation as Load Sharing mode? What will ...
user34639's user avatar
  • 313
4 votes
3 answers
2k views

LACP Huawei S6720

Once here I ask about LACP between rb750 and huawei ne20, as @Zac67 said "throughput for multiple flows, not for a single flow" . I was testing from a single flow, now is working, but I came ...
Shinomoto Asakura's user avatar
4 votes
1 answer
333 views

LACP: Between RB750 and Huawei Ne20

I'm making a test to create a PORT AGGREGATION between my RB750 and Huawei NE20. Rb750: Flags: X - disabled, R - running 0 R name="bonding1" mtu=1500 mac-address=D4:CA:6D:1D:6F:66 arp=enabled ...
Shinomoto Asakura's user avatar
1 vote
1 answer
365 views

Best way to connect VLANs / STP / LAG

Am having a problem connecting these concepts together, like when I try thinking of them being run on the same network. I'm able to understand each of them separately, but am not able to connect them ...
Saif Ahmed Yassen's user avatar
2 votes
1 answer
6k views

Bridge Assurance with vPC on port type network

I'm running two Nexus 3048 switches as network core and I got an issue when linking another switch (specifically a 2960-X) on the vPC links. Consider the scenario: +-------+ +-------+ | NX #1 |===|...
Vinícius Ferrão's user avatar
4 votes
1 answer
2k views

LACP and how to configure switches correctly

I want to set up a fast network and am considering options. I want a backbone switch that connects all my switches together. I can see options for SFP / SFP+ ports. Some SFP ports are 1 or 2 Gb from ...
harri's user avatar
  • 143
1 vote
1 answer
58 views

Create a trunk to a device with two NICs but one MAC address

I have a Linux device with two NICs, but they seem to share one MAC address. I want to configure a redundant network connection to a switch stack. Whenever I restart the end device, it is shutting ...
Display Name's user avatar
4 votes
1 answer
5k views

show mac address on aggregated interface - Junos

I am trying to audit which interfaces are plugged to which switchport on our EX3300 switches. The problem is that when using aggregated interface I see only one mac address. wadmin@SIN11-VCsw-48-11&...
Gabor Vincze's user avatar
1 vote
1 answer
585 views

LACP balanced VPN: Bad or good idea?

Imagine I have a computer with two slow cheap internet connections from ISP A and B. I also have a VPS in a datacenter with very high infinite bandwidth. I can make two VPN's. One from A to VPS and ...
Alexis Clarembeau's user avatar
0 votes
1 answer
686 views

Linux LACP (802.3ad) working for ingress traffic only?

We've setup LACP (802.3ad) on our Juniper switch and a Linux host, connected to the switch with 3x 1Gbps links. We are able to download from multiple sources at a rate of 3 Gbps, but when uploading ...
Anonymous's user avatar
1 vote
1 answer
534 views

The impact of LAG/LACP hash method and load balancing configuration on QoS

I've been looking for information regarding LAG/LACP configuration and the impact on QoS (such as packet delay, out of order delivery, etc.). I could only find statements such as "LAG/LACP guarantees ...
MJPeter's user avatar
  • 11
2 votes
1 answer
12k views

Cisco 2960 etherchannel suspended mode

Here is the configuration: Current configuration : 154 bytes ! interface Port-channel1 description TRUNK switchport trunk allowed vlan 10,20 switchport mode trunk end interface GigabitEthernet1/0/...
Satish's user avatar
  • 4,379
1 vote
3 answers
231 views

Increase network bandwidth

I have similiary situation like in question Increase transfer rate with Link Agreggation But with some different purposes - need increas backup speed. ServerA - backup media server (Win2008r2); ...
JJbaz's user avatar
  • 11
1 vote
3 answers
186 views

Possibilities to switch between primary and backup radios between locations

What are the possibilities of connection/link failover in the following configuration: 2 geographic locations connected by 2 independent radios (a primary and a backup, the backup is a mikrotik device)...
atapaka's user avatar
  • 111
2 votes
1 answer
2k views

What is the difference between 'clock synchronization' and 'time synchronization'?

Is there have any difference between this two terms, 'Clock Synchronization' and 'Time Synchronization' in a network? I understand that when clock frequency has corrected to run in same pace is called ...
Fida Hasan's user avatar
1 vote
1 answer
806 views

LACP static on HP Switch with multiple VLAN

I need to connect a 8 interfaces server to a HP J9854A 2530-24G-PoE+-2SFP+ Switch with LACP. Several VLANS are involved. It seems from this link: http://h20564.www2.hpe.com/hpsc/doc/public/display?...
nutopia's user avatar
  • 21