Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Broadcom Link Aggregation Team With 2x Cisco 2950

Posted on 2010-11-19
1
Medium Priority
?
1,682 Views
Last Modified: 2012-05-11
Hi,

I have setup NIC teaming on a server that has 2x 1Gbps Broadcom NICs in it. I have set the teaming mode to be Link Aggregation (802.3ad)

The switching setup consists of 2x Cisco 2950 NICs, which have been connected together using 2x crossover cables (there has been setup a port channel with switchport mode trunk and channel-protocol lacp for the 2 ports that the x-over cables are plugged into). The switches should be setup so that any one of them could fail, and the network would still function

Each NIC is connected to a different switch

I have not configured any particular options for the ports that the NICs are plugged into (beyond assigning a VLAN, turning off spanning tree, and setting the port speed).

When testing the machine's network throughput, I can see that only 1 NIC is being used - it doesn't seem to be aggregating the connection over both the NICs

I am guessing that there if further configuration that I need to do on the Cisco switch ports that the NICs are plugged into - maybe explicitly enabling LACP?

Whilst I understand how the switches are linked, I actually didn't setup them up myself, so what I'd like to know is the exact config setup that I need to do to the switch ports to achieve our 2 main goals:

1) When both switches are connected and fully functioning, we get an aggregated link - so that we effectively double the network throughput of the machine using both NICs
2) If one of the switches fails, then the network will still function (albeit at a reduced rate as only 1 NIC will be plugged into a functioning switch)

As a picture speaks 1000 words, I have uploaded a simple diagram of the setup as it is.

Regards A simple diagram of the server + switch setup
0
Comment
Question by:irc-corp
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 10

Accepted Solution

by:
cstosgale earned 2000 total points
ID: 34176132
Can't do this to two seperate switches I am afraid unless they are stacked (which you can only do with 3750s). Nexus switches can do this but that's another step up in cost.

With your current setup, you can either have active/standby into the switches and have it use only one nic at a time, or you can plug both NICs into the same switch. If you do the latter, you would need to perform this configuration under the switchports to enable LACP (802.3ad) (Make sure the config is the same on both ports first):-

int range fa0/2 - 3
channel-group 1 mode active

Make sure the number you choose for the port channel (1 in the example above) is not already used on the switch using:-

show etherchannel sum

in exec mode.

Once you have enabled the etherchannel you can use the above command to confirm it has negotiated correctly (each port should have a (P) next to it).

Having said all this, do you actually need 2 Gb of bandwidth to the server? Remember it won't actually give you 2 Gb of throughput over 1 connection to the server, but you could have 2 1 Gb connections concurrently.

I have rarely seen this sort of bandwidth actually being used except in bigger enterprise networks. If you are a larger enterprise, you can probably afford a couple of 3750s which you could stack :)
0

Featured Post

2017 Webroot Threat Report

MSPs: Get the facts you need to protect your clients.
The 2017 Webroot Threat Report provides a uniquely insightful global view into the analysis and discoveries made by the Webroot® Threat Intelligence Platform to provide insights on key trends and risks as seen by our users.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When you try to share a printer , you may receive one of the following error messages. Error message when you use the Add Printer Wizard to share a printer: Windows could not share your printer. Operation could not be completed (Error 0x000006…
This article is in regards to the Cisco QSFP-4SFP10G-CU1M cables, which are designed to uplink/downlink 40GB ports to 10GB SFP ports. I recently experienced this and found very little configuration documentation on how these are supposed to be confi…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

610 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question