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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).

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1answer
35 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 ...
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1answer
29 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 ...
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1answer
60 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 ?
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1answer
119 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 ...
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1answer
62 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 ...
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1answer
143 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 ...
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2answers
2k 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 ...
4
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2answers
89 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 ...
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1answer
584 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 ...
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1answer
52 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 ...
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0answers
69 views

Reroute traffic when one port in ether-channel fails

I have a problem with etherchannel - I have one router with L3 Etherchannel and one switch where is classic L2 etherchannel. I noticed when I shut down one interface inside L3 etherchannel on router, ...
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1answer
895 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 ...
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1answer
145 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 ...
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1answer
4k 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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1answer
76 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 ...
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2answers
418 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,
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1answer
67 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 ...
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1answer
167 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!
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1answer
212 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 ...
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1answer
559 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 ...
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1answer
52 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 ...
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1answer
87 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 ...
3
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1answer
88 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 ...
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1answer
1k 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: ...
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2answers
6k 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 ...
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1answer
210 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 ...
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1answer
195 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 ...
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1answer
745 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 ...
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1answer
474 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 ...
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2answers
377 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 ...
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2answers
653 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....
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2answers
2k 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 ...
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1answer
244 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 ...
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2answers
260 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 ...
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2answers
2k 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 ...
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2answers
7k 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 ...
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1answer
992 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 ...
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2answers
11k 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 ...
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3answers
5k 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 ...
4
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1answer
604 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 ...
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1answer
412 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 ...
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3answers
4k 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 ...
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2answers
259 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.
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2answers
92 views

Configure all ports located on other switches from one switch

Introduction If VLANs are configured on one switch (Switch1) and this switch is subsequently connected to another switch (Switch2) using a port channel, the VLANs configured on Switch1 are visible as ...
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1answer
216 views

Unable to access systems bound to ports of two Switches which are part of same VLAN [duplicate]

Introduction Situation 1: Port 1, 2, 3 and 4 from Switch1 have been assigned to VLAN X. All systems bound to these port can access each other. interface GigabitEthernet0/1-4 switchport access vlan ...
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1answer
1k views

Successful Auto/Auto PAgP Port Channel?

Cisco documentation states the following on forming channels: SW1 SW2 ---------------------------------------- On On = Yes Auto/Desirable Desirable ...
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0answers
1k views

Packet loss in port-channel between Cisco and HP

I have a Cisco6509 with sup 720-BXL connected to a HP customer switch. There are 4 links configured as a port-channel betwen both chassis. The configuration in the Cisco switch is: interface Port-...
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2answers
6k views

portchannel cant bundle flow control mismatch

Having a strange issue here.. I replaced a stack member (2 members in a stack of Cisco 3750x). Both switches have a 10Gb card and I had a perfectly working LAG/etherchannel between to 10Gb ports. ...
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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 ...
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3answers
7k 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 ...