Questions tagged [ieee-802.1ax]

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

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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 ...
4 votes
2 answers
933 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 ...
1 vote
1 answer
84 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 ...
0 votes
1 answer
196 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 ...
0 votes
1 answer
28 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 ...
0 votes
1 answer
2k 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 ...
0 votes
0 answers
48 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 ...
1 vote
0 answers
41 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 ...
10 votes
3 answers
4k views

Why is there no "round robin" option for lacp (at least on my switches)?

I am trying to increase bandwidth for particular hosts by using lacp on a Cisco Catalyst 4500 switch. However, it seems that I will always end up with the same flow (src/dst mac, ip, and port) being ...
0 votes
1 answer
213 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 ...
0 votes
1 answer
563 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 ...
2 votes
3 answers
873 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 ...
1 vote
1 answer
291 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 ...
4 votes
3 answers
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 ...
0 votes
1 answer
46 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 ...
1 vote
2 answers
125 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 ...
0 votes
1 answer
131 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 ...
1 vote
2 answers
412 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 ...
0 votes
1 answer
214 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 ...
2 votes
1 answer
742 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 ...
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 ...
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 ...
1 vote
1 answer
254 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 ...
2 votes
1 answer
549 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 ...
4 votes
1 answer
3k 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-...
1 vote
1 answer
657 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 ...
4 votes
2 answers
2k 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 ...
3 votes
2 answers
565 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 ...
5 votes
3 answers
9k 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 ...
1 vote
1 answer
714 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 ...
1 vote
1 answer
126 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 ...
4 votes
2 answers
6k 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 ...
6 votes
1 answer
548 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 ...
3 votes
1 answer
614 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 ...
6 votes
1 answer
1k views

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

Suppose you have a network like this: +-------------------------+ +---------------------------+ | | | ...
4 votes
1 answer
294 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 ...
2 votes
1 answer
4k 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 |===|...
11 votes
3 answers
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 ...
5 votes
2 answers
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 ...
4 votes
2 answers
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 ...
3 votes
4 answers
33k 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 ...
1 vote
1 answer
52 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 ...
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&...
1 vote
3 answers
3k 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 ...
1 vote
3 answers
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 ...
1 vote
1 answer
501 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 ...
0 votes
1 answer
634 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 ...
1 vote
1 answer
417 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 ...
2 votes
2 answers
3k 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 ...
2 votes
2 answers
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 ...