Questions tagged [ieee-802.1ax]

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

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11
votes
1answer
12k views

Can adding VLANs to a VPC be done hot?

In this scenario, we have a VPC '17', consisting of two single port port-channels 'po17'. There are 2 x N5K's (5548s) - so po17 from both sides combine to create the VPC. The downstream devices are ...
11
votes
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 ...
9
votes
3answers
6k views

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? Particularly, if we setup an EtherChannel group ...
9
votes
2answers
2k views

Switch-Assisted Load Balancing w/ Fault Tolerance

While studying for Cisco and Microsoft certifications I read a lot about NIC Teaming, Etherchannels and similar stuff. I know you can do static teaming in MS Windows Server or creating a port-...
9
votes
2answers
3k 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 ...
8
votes
2answers
20k views

LACP rate slow vs fast… impact on bandwidth?

Is there any impact on bandwidth when choosing fast (1s) LACPDU timing rather than slow (30s)? Anyone ever bothered to measure? I've always assumed it's negligable, with the simple act of bonding ...
7
votes
2answers
2k views

How do interfaces behave in a single-ended LACP configuration?

Situation: two ethernet connections, between a switch and a server. At the switch end, the two interfaces are configured for LACP. At the server end, they're configured as normal ethernet interfaces. ...
6
votes
3answers
3k views

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

I have a Debian Linux server with 4x 1Gb NICs, 2 onboard and 2 PCI. All NICs are configured into a single mode 4 LACP bonded interface: bond0 I have two switches: Cisco SG300-28 and Cisco SG300-10, to ...
6
votes
3answers
5k views

LACP from Cisco 6509 to Force10 S48-10 - in default VLAN1

A client has the following configuration: The entire network is on VLAN1, with the subnet 172.16.0.0/16 - performing a redesign of their network is not an option at this point, as they're a 24/7 ...
6
votes
2answers
3k views

Using channel-group mode on in my full Cisco enviroment

this is my first question over here. I have a question about using channel-group mode on or channel-group mode active. I have a core 3750x with 2 stacked SFPs nodes. Each pair of ports of a node ...
6
votes
1answer
762 views

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

Suppose you have a network like this: +-------------------------+ +---------------------------+ | | | ...
6
votes
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 ...
5
votes
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 ...
5
votes
1answer
5k views

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?
5
votes
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 ...
5
votes
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 ...
5
votes
2answers
3k views

Bond switch uplinks together for double bandwidth between switches

Traditional 802.3ad link aggregation only works when all of the links in the group are going to/from the same devices/switches. So you couldn't have a system with one half of a bonded link going into ...
5
votes
1answer
5k views

LACP on stacked HP 2920-48G

It is the first time that I am working with HP switches. I want to use LACP on two stacked HP 2920-48G switches. Does somebody have an example of the configuration I need to use on both switches ? ...
4
votes
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 ...
4
votes
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 ...
4
votes
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 ...
4
votes
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 ...
4
votes
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 ...
4
votes
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-...
4
votes
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&...
4
votes
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 ...
4
votes
1answer
3k views

Basic Link Aggregation scenario with high ping latency

Resume: I'm have a really basic network cenario with some new switches that I just bought. After configuring a LAG (without LACP) between them, I started to have ping losses and high latency. I also ...
3
votes
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 ...
3
votes
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 ...
3
votes
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 ...
3
votes
1answer
7k views

hp procurve trunk port group operation vs active lacp port group

We recently purchased some HP Procurve 2920 switches and in setting them up I noticed multiple options for port groups. I wanted to see if anyone can clarify functional differences between setting up ...
3
votes
1answer
1k views

HP Switching, DT Links to two STP switches?

I'm quite new to HP networking and have inherit a setup with HP 8200 switches connected using DT-LACP trunks. Our project right now is to connect two switches from another datacenter to these two ...
3
votes
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 ...
3
votes
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 ...
3
votes
1answer
293 views

HP E3800 Static Trunks

I am new to HP networking and have a question about the correct Syntax for static trunks. I have 2 x E3800 switches Mesh stacked, connected to those are 24 x E2530 layer 2 switches. Each 2530 has two ...
3
votes
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 ...
2
votes
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 ...
2
votes
1answer
2k views

Can we combine different kind of interface in Etherchannel?

I see on Cisco guide that: Each EtherChannel can consist of up to eight compatibly configured Ethernet interfaces. All interfaces in each EtherChannel must be the same speed, and all must be ...
2
votes
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 |===|...
2
votes
2answers
12k views

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

Aim The aim is to setup LACP. /etc/modprobe.d/bonding.conf alias bond0 bonding options bond0 miimon=100 mode=4 lacp_rate=1 /etc/sysconfig/network-scripts/ifcfg-bond0 ONBOOT=yes BOOTPROTO=static ...
2
votes
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 ...
2
votes
1answer
935 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 ...
2
votes
1answer
600 views

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

I have a Cisco WS-C3750G-12S switch physically connected with ports Gi1/0/1 and Gi1/0/11 to Cisco WS-C3750G-24TS ports Gi1/0/1 and Gi1/0/27 respectively. Ports have different LACP port-priority: WS-...
2
votes
1answer
2k views

static link aggregation

I have grouped two ports of a switch into a channel and specified load balancing based on source and destination MAC address. I do not understand how will the switch do load balancing, using which ...
2
votes
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 ...
2
votes
1answer
787 views

CDP/LLDP over LACP Trunk Several Devices

I have a 4-switch stack of Alcatel Omniswitches connected to an HP 5412 core via 8 uplinks; these are ports D11-D18. Unfortunately, the client did not yet give me access to the Alcatels, but a request ...
2
votes
1answer
5k views

LACP from Server to Switch

I am trying to configure link aggregation (LACP) from a server to a HP 2920-48G switch. The server has a 4 port Intel NIC that supports LACP, and a OS that natively supports LACP as well. The switch ...
2
votes
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/...
2
votes
1answer
599 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?...
2
votes
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 ...