Switching

Cisco cable-diagnostics with TDR

René Jorissen on August 26, 2013 0 Comments • Tags: #cablediagnostics #cisco #domain #reflector #tdr #time

Some Cisco switches have a way to check the condition of copper cables. This can be done via de command test cable-diagnostics tdr. TDR stands for Time Domain Reflector. More information about Time Domain Reflector can be found at the Cisco Support Community. The command can be very useful for basic layer 1 troubleshooting. core01#test … Read More

Configuration Example, Security

MAB and MDA in an IP Phone environment

René Jorissen on February 5, 2010 26 Comments • Tags: #5330 #authenticate #bypass #cdp #ciscoavpair #devicetrafficclassvoice #domain #hostmode #lldp #mab #mac #mda #mitel #multidomain #multiple #phone #radius #vsa

I blogged before about the MAC Authentication Bypass (MAB) feature in network environments. MAC Authentication Bypass can be used to secure the wired network by verifying MAC addresses to a central database. By using a radius server, like Microsoft IAS or FreeRadius, you can also redirect verified MAC addresses to a specific VLAN. Lately I … Read More