Solved

Layer 2 Connectivity Issue.

Posted on 2009-05-13
7
210 Views
Last Modified: 2012-05-06
I have a switch which won't allow me ping a management station.   This computer worked perfectly well before it was removed for a virus cleanup. Nothing has changed on the switch or switches!  It is a 3750 switch and both the management station the unreachable computer are all on the same vlan but on different switches across the network. The computer can reach the server with no problems. Port security was on but I had long removed it from the port, moved the computer to a different port, cleared port security from the port as well.  A different computer was used and still same results! When the computer is connected to some other location on the network(on a different access switch), it functions just fine!   I have done all but reset the switch. Does anyone have any idea of what I can possibly be looking at?
0
Comment
Question by:oliverwari
[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
  • 4
  • 3
7 Comments
 
LVL 21

Expert Comment

by:from_exp
ID: 24374327
please provide running config from that switch
please also triple check ip settings of that pc (incorrect subnet mask?)
please also check mac address table of that particular port.
0
 

Author Comment

by:oliverwari
ID: 24374735
Subnet mask is correct.

Connectivity-Issues.pdf
0
 
LVL 21

Expert Comment

by:from_exp
ID: 24375100
1/0/49 and 1/0/50 do have different vlans allowed (no 340 vlan on one of them)
I suppose those ports are used for uplinks/downlinks, so please check, that remote destination you are trying to reach is not behind that particular uplink port
0
When ransomware hits your clients, what do you do?

MSPs: Endpoint security isn’t enough to prevent ransomware.
As the impact and severity of crypto ransomware attacks has grown, Webroot fought back, not just by building a next-gen endpoint solution capable of preventing ransomware attacks but also by being a thought leader.

 

Author Comment

by:oliverwari
ID: 24375213
was trying to sanitize the configuration...it is vlan 340 for trunks. The access switch has redundant connections to the distribution layer.
0
 
LVL 21

Accepted Solution

by:
from_exp earned 500 total points
ID: 24375289
how do you archive redundancy? spanning-tree?
if yes, please try to ping from that pc your mgm station and try to search active down link port of the upper switch for that particular mac 552b
0
 

Author Comment

by:oliverwari
ID: 24375610
Thanks, you pointed me towards the right direction.
It was port security. Some dude had taken that computer and connected to a different switch and then brought it back...so I had the mac address glued to a port on the management station switch.  I have cleared the port and everything is back to normal.
0
 

Author Closing Comment

by:oliverwari
ID: 31580913
I searched the mac and found it glued to a non trunk port on a different switch. Cleared and all is back up.. You are good.
0

Featured Post

Database Solutions Engineer FAQs

In this series, we will discuss common questions received as a database Solutions Engineer at Percona. In this role, we speak with a wide array of MySQL and MongoDB users responsible for both extremely large and complex environments to smaller single-server environments.

Question has a verified solution.

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

Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
Compliance and data security require steps be taken to prevent unauthorized users from copying data.  Here's one method to prevent data theft via USB drives (and writable optical media).
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
Suggested Courses

624 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