Switching

Hi,i have a 3750 Stack with two switches. The IOS version on this machines is the c3750-ipbasek9-mz.122-37.SE1.bin oneThe IOS is installed on different switches but on this couple i have a trouble.A normale switch port has the following part of the c...

Hello all,I want to setup a fail-over environment at one of my customers.But the two core switches are not acting like I wanted to.My HSRP Stand-by switch is handling all the traffic.Anyone knows why and how to fix this?Also see attached image.Config...

I have a WS-C2960G-24TC-Lwith a 1000base LX SFPconnected via single mode to an Incomming gigabit circuit from SSE/Telco (Scottish and Southern Electric)this configuration works ok.When i move the connection to a WS-C3750G-24TS-1U (with the same sfp) ...

Hi I thought I share an issue I run into recently.I upgraded a 3750 switch stack to 12.2.55. Once I had upgraded all the switches I had an issue with Spanning Tree on the voice VLAN; the root bridge was blocking that vlan on the trunk portsThe errors...

Hi everybody,I need to know if there is a command that helps me to check out the amount of traffic or bandwidth (or both) that is crossing any Catalyst 3550 port. At the other hand, I have used wire-shark in kiddy tests, but I don't really know what ...

Hi,I would like to add three 3750X switches to my current production stack of four 3750 switches.  I was getting a version mismatch on the 3750X switches after stacking them all together. I disconnected the 3750X switches and tried to downgrade them ...

Hi everyone, I've got an issue with a NAT'ing issue, which is not allowing my GRE tunnel to establish over the internet.The basic run down is that Site 1 has a /29 subnet (assigned by IANA).Site 2 has a static IP assigned to the BGAN profile.Basic ru...

Hello expert, I have two  3900 series routers configured as hubs (dmvpn ) to do HSRP. I also configure three 2900 as spokes (dmvpn) I configure route A as primary router and router B  backup. Let me outline the configuration of Router A. I configu...

Recently we started seeing higher ping replies from a switch, which I realize in itself is not an indication of a problem, but this is the only switch that has a high count of "Tx Mode Drop" and "Sa Miss". I am unsure how to debug further and try to ...

Hello everyone, simple and plain question.... Can TCN BPDU's reach 1500 bytes in size? suddenly when we attach a new device to the topology we can see an increment on the traffic and the are all 1500 bytes in size, we assume they are TCN BPDU's (at l...

Hi experts,I have a switch stack. They are the following models and at the following firmwares:Switch Ports Model              SW Version            SW Image------ ----- -----              ----------            ----------*    1 30    WS-C3750E-24TD  ...