Questions tagged [ieee-802.1ax]

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

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Aruba 2930M Vlan Trunk problem [duplicate]

I am trying to connect two Rooms under the same network( 192.168.2.xxx) The first Room has two Aruba 2930M switches stacked together and the second room has one Aruba 2930M Switch. I have 6 SFP+ ...
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3answers
144 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 ...
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1answer
32 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 ...
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203 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 ...
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2answers
129 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 ...
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3answers
1k 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 ...
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1answer
35 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 ...
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2answers
36 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 ...
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1answer
33 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 ...
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2answers
61 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 ...
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22 views

Queries regarding LACP

I have following queries regarding LACP. Query 1 In LACP flag we have a field called as Aggregation, where 1 represents Aggregatable and 0 represents Individual. In all the PCAP's I have seen so far ...
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1answer
44 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 ...
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1answer
187 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 ...
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8 views

Transit lacp pdu on cisco 2960 [duplicate]

Is it possible to transfer lacp pdu over 1 physical channel without aggregation on the cisco catalyst 2960? Commands such as "switchport mode dot1q-tunnel" or "l2protocol-tunnel" ...
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1answer
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 ...
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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 ...
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119 views

LACP MAD-Passthrough and IRF

What is the purpose of LACP MAD-passthrough, and is it only useful with IRF/VSF? This is a command available on trunk (LAG) interfaces on Aruba switches, and I think it is proprietary to HPE/Aruba IRF ...
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1answer
127 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 ...
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1answer
363 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 ...
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1answer
1k 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-...
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1answer
475 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 ...
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2answers
988 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 ...
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2answers
300 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 ...
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3answers
8k views

Juniper equivalent to Cisco's vPC?

I'm looking to implement a new network design with Juniper EX Series switches. Part of this involves implementing vPC between my core and ToR switches (and also between ToR and host). The goal is to ...
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1answer
344 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 ...
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1answer
94 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 ...
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2answers
4k 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 ...
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1answer
510 views

Cisco SG300-52 SNMP ifInOctets Values Unreasonable

On the SG300-52, I've noticed that SNMP monitoring of LAGs versus regular switch ports give incorrect (way too large and unrealistic) values for the octets transferred. For simplicities sake, let's ...
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1answer
397 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 ...
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1answer
762 views

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

Suppose you have a network like this: +-------------------------+ +---------------------------+ | | | ...
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1answer
242 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 ...
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1answer
3k 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 |===|...
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3answers
4k views

OSPF over vPC on Nexus7k

I'm trying to help a friend with some Nexus issues. The topology is like this: Cat 3750 stack -> vPC -> 2x N7k -> LACP -> Fortigate firewall cluster The 3750 stack is running OSPF to both the ...
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2answers
2k views

Juniper trunking with two links (not using LAG)

Some reason I'm drawing a blank on this. Let's say I have two EX switches connected together with 2 links to each other (xe-0/1/0 and xe-0/1/1 on both switches). I can easily setup a trunk on one of ...
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2answers
2k views

Force10 port channel to server that also supports PXE boot

I have an 802.3ad port channel comprised of 2 10GigE links from a Force10 E1200 switch to a Linux server with one dual-ported 10G NIC. This setup works great when Linux speaks LACP and brings up a ...
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4answers
30k views

LACP Suspended Trunk Link

I have a LACP bonded trunk link between 2 switches, the bond contains 4 interfaces; all interfaces work fine except one. Cisco says you have to have matching configurations on all interfaces. The ...
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1answer
50 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 ...
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1answer
4k 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&...
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3answers
2k views

What iperf flags should I use to test link LACP bond total speed

I have created an channel group with LACP, I know that single TCP session will be sent over a single line. My hashing algorithm is set to source mac address. So how can I be sure that the bandwidths ...
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3answers
5k views

STP and LAG Problems

I'm having some trouble with STP on our network. I have created a 3 tier network made up of Dell and Cisco switches. The topology is as follows: The core consists of two Dell N4032 10Gbps switches in ...
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1answer
326 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 ...
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1answer
567 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 ...
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1answer
315 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 ...
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2answers
2k views

MCLag active-active and VRRP

I have a pair of Juniper routers each one having drops from ISP. We advertise same IP blocks from both the routers on WAN interface. Now on the Lan side, we have pair of HP core switch running IRF ...
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2answers
1k views

Adding a switch to provide redundancy

I inherited a network laid out (very broadly speaking) as follows: A number of access switches connect to 2 main switches. The Main Switch in the MDF (SW1) connects to the WAN router and is connected ...
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3answers
8k views

How to configure PAgP or LACP on GNS3

In gns3, when i configure a router with a NM-16ESW module to use as a switch. And I can not configure PAgP or LACP on this router. It has only one mode ON, and there is no DESIRABLE or AUTO or ACTIVE ...
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1answer
2k views

LACP trunk between BNT layer2/3 switch and Cisco 2960s stack on a bladeCenter H

My objective is to replace a Nortel 5520 stack with a stack of Cisco 2960s. The old working configuration was using mlt trunk between 5520 and BNT layer 2/3 switch. I will use LACP for the trunk ...
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1answer
7k 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/...
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3answers
164 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); ...
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3answers
99 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)...