Switching

Hi Everyone,  I recently had an instance in one of my networks where a user plugged in a home router to our network. The router then started handing out incorrect IP addresses to clients.  I know I can use DHCP Snooping or BPDU guard to stop this hap...

Dear All, After a bandwidth upgrade from 10 mpbs to 20 mbps, the interface keeps flapping intermittently on a nexus 5k switch. The switch is connected to 3750 located at another location. We could observe that cdp neighborship flap occurs only on the...

We deploy networks that utilize per-user VLAN segmentation.  We allow users to set up accounts, and every device associated with an account will be assigned the VLAN of that account by our RADIUS server.  For a network with many users, this means we ...

Currently I am using an ACS server for my dot1x authentication but we want to transition directly to Windows 2008 NPS.I have updated the Cisco switches with the IP and shared secret of our NPS, but when I go to authenticate, my NPS server is seeing t...

Dear. we are using at cisco router ASR1001 the command: show ip cache flow, to see the conversations at real time.this is a partial output of this command: SITEL_CHINCHON_CD90445#sh ip cache flowIP packet size distribution (392661M total packets):   ...

I have two 6500 series switches; a 6506 and a 6509.   Can I run VSS between these two different hardware models? 

Hi Everyone,As per the attached network diagram, we have 5 remote sites(10.10.0.0/16, 10.20.0.0/16, 10.30.0.0/16, 10.40.0.0/16 and 10.50.0.0/16) and data center (10.1.0.0/16, 10.2.0.0/16).Remote sites are connected with two ISP to data center. We hav...

Anyone had any issues with getting a GLC-LH-SM module to work in a 3750G-48TS switch? Any special commands to make it work?I have a customer who can't see any link lights not see the 2960G switch on the other end with another GLC-LH-SM module. I've...

My Catalyst 4507 has started posting the following message in the log file.  It occurs for several ports on line cards 2 and 5 with varying speeds of 10, 100, and 1000 kbs.  Is this normal or indicate possible issues?  Both line cards were recently r...

I am currently trying to configure multicontext firewall where the outside interfaces of each of the three context is on the same subnet. When I am running ospf only one of the context is creating adjacency and others are stuck in exchange state.Any ...

 I have had my 7206vxr that has been running fine for about 5 years now.Just today I have noticed that I am no longer able to SSH to the machine. I am getting the following error every once in a while from the ciscoOct 23 10:06:23 172.16.0.1 12483: O...

Hi all,This would be a weird and specific scenario. We are running 2960X in stacking, IOS version 15.0(2)EX5There is a WD MyCloud EX4 NAS storage come with 2 gigabit ports. No matter what is the network configuration and load balancing mode (adaptive...

Recently aquired several c3650's which is the first time I have had IOS-XE in my environment.  I noticed when I type sh ver there is a mode value which is currently set to INSTALL.  In reading it appears it can be set to either INSTALL or BUNDLED, it...

Hi forum, we apologize if we post on wrong community/sub-forum. we have analyzed our traffic on vlan 706 have high traffic experience. what we dont know is, what server/user that use that traffic.we have nexus 5K, and want to enable netflow on that d...