I'm trying to understand how spanning-tree works and i do understand that the link between switch 22 and switch 17 should have one port blocked by spanning tree. So far so good, but that link should choose its designated port based on the switch with the lowest bridge_ID, which in this case is switch 22.
So, switch 22 int g1/2 should be a designated port and switch 17 int g1/1 should be block by spanning tree (non-designated). But, according to cisco packet tracer it is the other way around. Why is that?
Information shown by "show spanning-tree" only improves my point. But, i have noticed when i was analyzing the STP packets send from each switch that STP used the mac address of the gigabit interface ports and not the mac address of the switch, which is displayed as the mac address of vlan 1. Is that a bug? because bridge_ID has the mac address information of the switch and not the indiviual ports.
[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...