Questions tagged [etherchannel]

Etherchannel is Cisco's proprietary layer 2 link aggregation (LAG). It is mostly compatible with the open IEEE 802.3ad/802.1AX standard (LACP).

Filter by
Sorted by
Tagged with
1 vote
1 answer
175 views

Why its need to use trunking when using etherchannel? [duplicate]

what's the reason to use trunking by using the 2 below commands: switchport trunk encap dot1q change the mode to trunk between EtherChannel ports the second question why to make native vlan under ...
banoosh's user avatar
  • 11
0 votes
1 answer
147 views

Is a port channel necessary between redundant core switches?

A course I am following mentions some examples and basics of network design, which includes the 2-tier/3-tier campus LAN designs. About the 3-tier design Would a port channel be necessary between C1 ...
Mitrixsen's user avatar
  • 803
2 votes
1 answer
285 views

Using PT and EtherChannels along with STP

I'm very new to all of this but I am trying to create a network topology as practice that uses three etherchannels across three switches and then rely on STP to block one. So far it was working well. ...
James's user avatar
  • 23
3 votes
1 answer
448 views

EtherChannel ports standalone after restarting packet tracer

I got two L3 switches (Cisco 3560) with no switcport ports connected to L2 switch (Cisco 2960). It used to work, but when I saved and restarted Packet Tracer -- all ports went into standalone mode. ...
EugeneKannou's user avatar
0 votes
1 answer
220 views

test etherchannel load-balance command doesn't work

I am trying to learn the etherchannel environment but when I enter this command it gives an error. Switch#test etherchannel load-balance interface po1 mac 00d0.ba86.1e19 00d0.ba86.1e1a ^ % ...
Red And Black's user avatar
0 votes
0 answers
59 views

Two etherchannel in a switch

I configured two etherchannel in "switch 3" with LACP, however i cannot ping pc1 to pc0. they both are in same vlan and i configured in port-channel with "sw trunk allowed vlan all". but still i ...
R.A's user avatar
  • 1
0 votes
1 answer
116 views

Is it possible to limit the number of active links in a channel group?

I've got 2x3750 switches with 4 physical links in between. I've bundled all the physical links using PAgP, but I want ONLY 2 links to be active at any single time. How do I go about this?
Ozan's user avatar
  • 1
2 votes
1 answer
192 views

Two channels between two switches

Is there a way to provide two physically diverse channels between two switches? I'm using two Cisco Catalysis 3560s, and I want to have two separate channels between them, with different access ...
Matt Hall's user avatar
  • 145
1 vote
1 answer
279 views

Etherchannel configuration on two differents routers and 1 L3 switch

Is it possible to configure an aggregation etherchannel between two routers and one L3 switch, means that : the one link in : R1 <-> L3 Switch1 , and the second aggregation link in : R2 <-> L3 ...
Mamitiana Ra's user avatar
5 votes
1 answer
18k views

what is the difference between port-channel and etherchannel?

As the title said, I do not make the difference between port-channel and etherchannel. For me they both aggregate ports in an Ethernet networks using Cisco parlance. What subtlety do I miss ?
dominix's user avatar
  • 195
3 votes
1 answer
2k views

Add links to a port channel group without downtime

There are two trunk links with the same configuration connecting two switches. Currently they are independent links and one is blocked with spanning-tree. I would like to convert these to a single ...
Yanzzee's user avatar
  • 325
1 vote
1 answer
792 views

Sharing VTP Info Between two VTP Servers

Im trying to share info between two vtp servers these vtp server are connected using Etherchannel I have configured both on server mode, using the same domain and password, but the right one is not ...
José C. Arbildo López's user avatar
3 votes
1 answer
450 views

How would I configure etherchannel for this particular topology?

How would I setup and configure etherchannel from switch0 to all the other switches? Switch0 has been configured as the root bridge, Router0 has been configured to be the gateway for each Vlan and as ...
Bobby100211's user avatar
5 votes
3 answers
12k views

How to trunk VLANs over Layer 3 EtherChannel?

I am trying to setup a network that includes an EtherChannel link between two Cisco Layer 3 switches (Catalyst 3750). I am using a collapsed core hierarchical network. The picture above is my ...
Roy T.'s user avatar
  • 65
3 votes
2 answers
435 views

Switch to Server Connectivity

I have a question regarding server to switch connection. I know in case of two switches connected together like below ,STP will work to block 3 out of 4 cables to prevent the layer2 loops, otherwise ...
Ethem's user avatar
  • 307
2 votes
1 answer
1k views

Link Aggregation (Etherchannel) between 2 cisco switches ( fibre link, and with an intermediate switch)

I have 3 switches soon to be setup in topology as shown below I have a fibre link and LAN cable directly connecting switch1 and switch3 and also another connection going from switch1 to switch3 via ...
jaggi's user avatar
  • 127
1 vote
1 answer
58 views

Need clarification on some Cisco configurations

Here is the situation : I have an HP server with 2 network interfaces linked to a Cisco switch. I want to configure the switch to accept the NIC teaming of the server. I have always believed that the ...
Ciscow's user avatar
  • 11
1 vote
1 answer
5k views

Interface suspended when linking access to core

Some help required please. I have a stack which contains two access switches, and an interface from switch 1 has a successful link to the core. However, when I try adding a secondary link on switch ...
BabyPython's user avatar
2 votes
1 answer
327 views

Why Ether-channel Index for Both Ports is same ?How Hash algorithm will work?

I have created a Ether-channel between Cisco 35060G and 2960G for practice purpose and to test Load balance . Here is a output from sh ether-channel detail and it shows Index for both the ports ...
Terminator's user avatar
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
1 answer
125 views

Etherchannel configuration!

I´m trying to test this etherchannel configuration but did´t work properly. The goal is: I want to entablish a L2 communication channel between A and B, but i neet to put on the middle 2 equipments ...
Orlando Gaetano's user avatar
1 vote
2 answers
720 views

mLACP or vPC on L3 interfaces

I just want to know if it's possible to implement mLACP (with VSS) or vPC on L3 interfaces. I just can't find any answer to this on cisco doc. Thanks,
Jey10's user avatar
  • 180
1 vote
1 answer
243 views

L3 Etherchannel cost calculation

Q1: I have read that in layer 2, if any of the links of a portchannel goes down,the cost of the portchannel is recalculated. Does that apply to L3 portchannel also? If so, assume I am running OSPF in ...
fsociety's user avatar
  • 893
3 votes
1 answer
285 views

Is test etherchannel load-balance disruptive?

Is this command disruptive or just a logical exercise of existing configuration? test etherchannel load-balance int po3 <some mac here> Platform is 6500 series, running IOS. Thank you!
A L's user avatar
  • 3,310
1 vote
1 answer
350 views

Etherchannel Basics

Assume we have 2 switches connected back to back with 2 links as shown below: Please see the attached image. In traditional STP environment,one link will be blocked to avoid Layer2 loops. So ...
fsociety's user avatar
  • 893
1 vote
1 answer
759 views

Distributed Trunking with HPE 5130?

I am about to plan a Core Switch for a customer, who has only access switches connected to each other. I'd like to connect every core switch with two fiber connections to each of the two HPE 5130. I ...
mike.b93's user avatar
  • 203
1 vote
1 answer
78 views

Link Aggregation and Balancing Methods

This might be a silly question, but I am not really sure about how this works. When you form Link Aggregation (or EtherChannel in Cisco terms), the traffic going through that logical port will be ...
user29449's user avatar
1 vote
1 answer
134 views

Guidelines for network design of bladecenter

I'm setting up a lab environment consisting of an IBM Bladecenter H (equipped with 4-NICs blade servers and 4 Cisco 3012) and 2 3750 as Aggregate switches. The blade servers will host VMWare and ...
kuma's user avatar
  • 187
2 votes
1 answer
117 views

etherchannel loadbalacing logic question

Questions: How does etherchannel will loadbalance traffic here when traffic coming from internet, L3 will hash IP src-dst but one that traffic pass to first L2 switch (distributed) how does that ...
Satish's user avatar
  • 4,379
2 votes
1 answer
4k views

Etherchannel physical port SPAN mirror

We have 4x1G Etherchannel on trunk and for troubleshooting i want to monitor one of its physical port. Can i monitor using SPAN port mirror and configure its physical port for source SPAN? Group: ...
Satish's user avatar
  • 4,379
4 votes
2 answers
12k views

Help optimize a LAG with LACP and two different algorithms on each side

We have a 4Gb (4x1G) LAG trunk with LACP between two cisco switches (c3850<--->c4948) and i am noticing that it is not doing proper load-balancing. I found SW1 using src-dst-ip algorithm and SW2 ...
Satish's user avatar
  • 4,379
2 votes
1 answer
527 views

Is there no "mode on" for channel-group in GNS3?

I am using GNS3, and a 3700 as L3 switch (router with ethernet switch module); everything is OK, but when I want to configure two ports as an etherchannel connection, the command channel-group doesn't ...
Ahmad Z. Tibi's user avatar
1 vote
1 answer
489 views

questions about link aggregation

How many interfaces can we group as a link aggregation on a Cisco switch? How many interfaces, if they all are full duplex? Can we check the value of used bandwidth of ether channel group? How many ...
MuSaB07's user avatar
  • 47
2 votes
1 answer
3k views

Link aggregation: disable spanning tree

It's a simple question, with switch interfaces using etherchannel,is necessary to use bpduguard in these interfaces for that disable Spanning-tree? Because using mode simulation of Packet Tracer, I ...
Shinomoto Asakura's user avatar
1 vote
1 answer
2k views

How to achive switch redundancy between ASA Cluster Control Link

I have two ASA 5525-X in cluster. Between them, for Cluster Control Link, I have Switch. When this switch fails, both CCL fail and both ASAs shut down cluster mode. (data interfaces are shut down). ...
John's user avatar
  • 812
2 votes
1 answer
716 views

Cannot get etherchannel/port-channel to work with Nortel MLT

We're replacing aged Nortel core/distro with Cisco. Just put in a pair of stacked 3750X 24 port SFP switches. From there, we try and run 2 pair of fiber out to access switches. Some are Nortel/Avaya ...
JP Briggs's user avatar
3 votes
2 answers
578 views

PAgP over transparent wireless point-to-point links

We have 2 buildings which are interconnected by 2 wireless P2P links. One is used as main connection, the second one is for redundancy and backup. So far, we have these 2 buildings in flat L2 network ...
phandox's user avatar
  • 386
1 vote
2 answers
793 views

Port Group Cisco 2960X + HyperV or any server

First of all thank you in advance trying to solve my issue. I'm trying to Team 4 NICs on HyperV and QNAP server to my switch Cisco 2960X in order to get 4Gbps data transfer rate to backup data faster....
Narbeh Davoodian's user avatar
6 votes
2 answers
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 ...
Felipe Oliveira's user avatar
3 votes
1 answer
297 views

Etherchannel trying to forward traffic through disabled ports

I am troubleshooting intermittent connectivity issues towards a WLC connected to a stack made of three 3750G switches. Part-number and software version of the switches are: Switch Ports Model ...
Daniel Yuste Aroca's user avatar
2 votes
2 answers
405 views

Does the Cisco 3560-CX support Layer 3 Etherchannel?

Does the Cisco 3560-CX support Layer 3 Etherchannel? I can see from the specs that this switch supports Layer 2 Etherchannel and that it is a layer 3 compact switch. However, it doesn't have the full ...
Anne-of-GG's user avatar
4 votes
2 answers
4k views

Ethernet Channel bundling changes Full-duplex links to Half-duplex

I have three switches connected to each other with two links (one of them is a redundant link using STP), but I have configured EtherChannel so that both the links work together as a bundle, What i ...
Riley Willow's user avatar
2 votes
2 answers
9k views

ARP issue among whole network caused by MikroTik CloudCore1036 router and HP 1810-24G switch missconfiguration [closed]

MY QUESTIONS ARE: Why configuration at layer 2 at layer 3 device at different site of LAN caused problem at another part of the network ?! What kind of mechanism at CC1036 has been activated that ...
DDos Schwagins's user avatar
1 vote
1 answer
1k views

HP 1810-24G and Mikrotik CloudCore1036 - 1Gb link negotiation problem between [closed]

MY QUESTIONS ARE: What could be the cause of this nondeterministic HP switch behaviour ?! Why sometimes devices make 100Mb link and sometimes 1Gb ?! At above picture You can see part of my network ...
DDos Schwagins's user avatar
2 votes
2 answers
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 ...
030's user avatar
  • 553
1 vote
3 answers
7k views

Ether channel between Cisco switch and Dell server

We are trying to form the ether channel between cisco WS-C3560V2-48PS model switch with DELL server but ether channel is not established between them. Dell server has 4 NIC and its connected with ...
Raja's user avatar
  • 11
5 votes
1 answer
1k views

What is the technical reason for PaGP Silent mode and why is it a default?

So I have done a little reading around PaGP silent mode, and I don't understand why it exists. My understanding is from: The silent mode is used when the switch is connected to a device that is ...
Acyclic Tau's user avatar
-1 votes
1 answer
727 views

How port, channel and interface are working together?

I do know about Physical port but a little knowledge about channel and interface, can any one explain how these 3 work simultaneously, i am not getting proper idea and from cisco i got to know about ...
BUGGY's user avatar
  • 41
9 votes
3 answers
7k 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 ...
Weaam's user avatar
  • 193
5 votes
2 answers
348 views

Why FastEthernet STP Link Selected over EtherChannel?

What are the possible reasons why STP would choose to use a FastEthernet link over an EtherChannel? Below is a network diagram where this is happening.
Allan Chua's user avatar