I have dual 6509's with SUP2MSFC2's running version 12.2(18)SXF14 IPServices WAN IOS, in my core. Today someone plugged a DLINK switch and caused problems with spanning-tree. How can I prevent this from happeneing again when someone plugs in a DLINK switch? any suggestions?
You will have to look into commands like 'spanning-tree guard root' and 'spanning-tree bpdu-filter' in order to secure your Cat6500.
Also, make sure that you have set 'spanning-tree vlan xxx root primary' one one Cat6500 and 'spanning-tree vlan xxx root secondary' on the other. Then you are in control of where your Spanning Tree root is supposed to be and you are minimizing the chances (risk) of having another switch taking over the Spanning Tree.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...