Solved

Active/Active use of 2 Catalyst 3650 core switches and Catalyst 500 Access switch

Posted on 2008-11-03
2
830 Views
Last Modified: 2012-06-22
We have a network infrastructure containing 2 Catalyst 3560's and several Catalayst 500 Express. The 3560's are used ase core switches, the 500's are access switches for phones and desktops.

The 2 3560's are connected directly with two interfaces (copper), no etherchannels of special portsettings. In my opinion, the 3560's act as an active/passive cluster. I would like to have an active/active cluster. Looking at the attached images, I think that NIC 3 and NIC 4 of the server are only connected for redundancy in case of failure of a 3560.

The 500's are connected with the two Gbit interfaces to both 3560's. STP shuts down one of these connections. This ends up in all client traffic redirected to one 3560. This makes me think only NIC 1 and 2 from the server are used. Is this correct ? How can I optimize the situation so all network traffic from the clients is divides between both 3560's and so all server NIC's ?
Switches.jpg
0
Comment
Question by:buddhole
[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
2 Comments
 
LVL 50

Accepted Solution

by:
Don Johnston earned 500 total points
ID: 22868711
Simple answer is that you can't. You cannot have more than one layer 2 path between any two devices. If you did, a broadcast storm would result which could prevent any traffic legitimate traffic from moving.

If all the NIC's on the server are in the same network (broadcast domain) then all but one will be disabled.

The only work-arounds to this would be either to use etherchannel (which require the additional link be between the same devices) or put half the devices in one VLAN and the remaining devices in another VLAN. This would require the NIC's on the server to be in different VLAN also.
0
 
LVL 5

Author Comment

by:buddhole
ID: 22870262
What about putting half om the 500's on one 3560 and the rest on the other using Etherchannels like you suggested ? I now have the feeling that a pretty expensive switch (for smb) is doing almost nothing. In case of failure we only need to reconfigure one of the switches.
0

Featured Post

How Do You Stack Up Against Your Peers?

With today’s modern enterprise so dependent on digital infrastructures, the impact of major incidents has increased dramatically. Grab the report now to gain insight into how your organization ranks against your peers and learn best-in-class strategies to resolve incidents.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Network Switches Keep Failing 8 111
fibre channel switch - sfp needed? 2 61
Classlful vs Classless subneting 18 82
Switch ports not working 8 97
The worst thing when starting a new job is when the previous Network Administrator left behind no documentation. How do you get into the devices? If you've been in this situation or just accidently mistyped your password, this article will hopefully…
I eventually solved a perplexing problem setting up telnet for a new switch.  I installed a new Cisco WS-03560X-24P switch connected to an existing Cisco 4506 running a WS-X4013-10GE Sup II-Plus. After configuring vlans and trunking,  I could no…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

738 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