Switching

Hi Expert,I found error %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on GigabitEthernet Now, i disable keepalive and error disappear but i need to know this error cause network loop or software bug?IOS:12.2(53)SE2Thanks for all reply

There are two Catalyst 6509-E switches with two Supervisor 720 modules on each of them. I need both supervisor uplinks to become VSL links, so i have configured Ten5/4 - 5 and Ten6/4 - 5 (these ports are on Supervisor modules) as VSL links, where:   ...

Hi, How can I prevent my network form virused PCs. Las night i had problems on my network and aftech checking logs in my 3560x there was problem with MAC flap.Is possible prevent network from this with config in our switches?ThanxBRDave

Hello everyone.I have a 2x Nexus 7018 set up as a distribution switches connected to each other connecting to about 47 Cat 4507 edge switches.  All but 4 of these switches are working properly.  The nexus is running code 5.0 (2a) and the 4507's are r...

Hello, everyone:I am encount a problem when I do a Local SPAN on an 3750 Switch.My 3750 runs on  version 12.2(25)SEB4 IOS .I need to SPAN two port's traffic to one port to work with Websense.  The port  needs to be able to monitor and send traffic.  ...

I have 3 3750's (not stacked, they are at different floors) with a total of 60 user vlans all together, we are trying to allow each vlan to the internet and block access to any other vlan.so sayvlan2 : 192.168.2.0\24vlan3 : 192.168.3.0\24......vlan61...

Hi to all,I would like to seek your help regarding my problem. I have a client that have a combination of cisco & hp switches. They want to implement redundancy & aggregation. I suggest using LACP for aggregation (cause it is used by HP) & STP for re...

Hi All,I am in the process of developing a spec that is to be used for the purchase of a significant amount of Cisco switch hardware, mainly from the 2000 and 3000 series.I was wondering if you could help me confirm that I have included everything.20...

Hi all of you out there,Recently we installed an NLB Cluster using microsoft terminal services 2008 and just after we finished the installation some clients could connect but some others didn't, after tryning some posible solutions we just did the fo...

Hi,We have a 3750G stack formed by 3 switches. We wanto to make the following configuration:Monitor the traffic from one interface (gig1/0/1) to another interface (gig1/0/2)We have a port (gig1/0/3) configured as trunk with two VLANs(100, 101). We wa...

I have noticed that IE3000 have it since a long time, and the small switches got it with 12.2(58).I wanted to evaluate adoptions for my customers but I could not find word about in any documentation, release notes, nothing. All references are about o...

    Greetings:I have a device that I want to power using a 3560G POE switch (WS-3560G 24PS).The device is a Ubiquiti Litestation2 embedded wifi bridge which can be powered using "Passive POE".The specs on the Ubiquiti board (http://ubnt.com/downloads...

Hi,I tried to upgrade the switch with the command archive download-sw /overwrite tftp://192.168.0.24/c3560-ipservicesk9-mz.122-58SE1.tarI looks the process was correct, no error was displayed. after aplied reload command the switch shows the messagei...

I have below config on a Router and a Switch which is directly connected to each other.------------------ On Router -----------------------Router_C2811#!interface fast 0/0 no ip address speed auto duplex auto!interface FastEthernet0/0.10 encapsulatio...