Solved

Cisco GBIC interface

Posted on 2006-07-05
4
783 Views
Last Modified: 2008-03-06
Have 5 cisco switches

1 Cisco 3512
2 Cisco 3548
2 Cisco 3550

Up until last week, I only had 1 3550 for a total of 4 switches.  These 4 switches were all connected via the GBIC interface, with the cable that looks like a firewire cable.

Now I'm trying to install this newest 3550.  I want to hook it up to the existing 4 switches by means of the same type of GBIC interface.  However, as soon as I hook up the GBIC's and power on the new switch, it immediately takes one of the other switches offline. (Haven't narrowed down which one yet).

I should also mention that the existing 4 switches are setup as a cluster, with the existing 3550 as the cluster commander.

I've already connected to the new switch via the console port, gone through the initial setup, assign a unique IP address, setup passwords and so on.

Currently the new switch is up and running, but it's connected to the existing switches via a normal CAT 5 cross-over cable, through one of the ordinary ethernet ports.  This will work, but needless to say, transfer speeds won't be great once this switch becomes loaded.

So basically, I need to know what kind of limitations come with the GBIC interface method.  Is what I'm trying to do even possible?  If so, what am I doing wrong?


0
Comment
Question by:psueoc
4 Comments
 
LVL 22

Expert Comment

by:Rick Hobbs
ID: 17046277
It can be done.  Post your configs.
0
 
LVL 12

Accepted Solution

by:
Scotty_cisco earned 500 total points
ID: 17046396
The 3548's and 3512's had what was called giga stack ports your firewire ports as you put it.  the 3550 I am assuming you bought a gigstack port for it as well?  If this is the case do you have a spanning-tree loop?

show spanning-tree blockedports this could be shutting down one of the ports the GIGA stack ports are a bit picky and are only 1/2 duplex if connected to more than one switch at a time so transfer rates are not going to be that much different you will see a bit slower speeds but I would recommend upgrading all the gigastack ports to a true GBIC with a COPPER ethernet cable would improve performance and be full duplex also eliminate problems with spanning tree if you happen to be looping an exisiting GBIC.

Thanks
Scott
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Wireless network monitoring 8 71
Tools to detect weak WiFi routers prior connecting to it 14 138
Router Question 12 55
can't ssh to external IP 9 23
In the hope of saving someone else's sanity... About a year ago we bought a Cisco 1921 router with two ADSL/VDSL EHWIC cards to load balance local network traffic over the two broadband lines we have, but we couldn't get the routing to work consi…
Getting hacked is no longer a matter or "if you get hacked" — the 2016 cyber threat landscape is now titled "when you get hacked." When it happens — will you be proactive, or reactive?
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…
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…

829 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