![]() CDP (Cisco Discovery Protocol) ![]() I mean, what is the ID when it is correctly split into the port prio and the port number? That is, how is the ID displayed on a Cisco device when the “show spanning-tree” command is issued? (Hint: This is the 1998 version of 802.1D, not the 2004.) CHALLENGE: What is the root bridge identifier for VLAN 121? 2nd CHALLENGE: At what time (relative to the beginning of the trace) did the first topology change occur? 3rd CHALLENGE (a bit tricky): What is the port identifier in VLAN 30 from bridge “00:21:1b:ae:31:80”. Spanning-tree portfast bpduguard default . Spanning-tree loopguard default spanning-tree portfast default , and Spanning-tree mode rapid-pvst, appears per default every 2 seconds on all switch ports per VLAN! I additionally use If you are not familiar with any of these protocols, please wikipedia it yourself. In the following I am only listing the protocols by name and their basic configuration. Of course I preferred IPv6 rather than legacy IP for all “above layer 2” protocols. Posts with some Wireshark screenshots and explanations are tagged with Wireshark.) And if you are interested in some more pcap files on my site follow the pcap tag. (In two upcoming posts I will first list many show commands from the routers/switches in the lab that are related to the CCNP SWITCH protocols, while in a third one I will show all answers to the proposed questions here with appropriate Wireshark screenshots. On some switches the SDM template must be changed to be IPv6 capable such as Of course I am running my lab fully dual-stacked, i.e., with IPv6 and legacy IP. Feel free to download the pcap and to test your protocol skills with Wireshark! Use the comment section below for posting your answers. I am further listing 46 CHALLENGES as an exercise for the reader. In this blogpost I am publishing the captured pcap file with all of these 22 protocols. Oh oh, I remember the good old times where I merely used unmanaged layer 2 switches. And because “ PCAP or it didn’t happen” I captured 22 of these protocols to further investigate them with Wireshark. While preparing for my CCNP SWITCH exam I built a laboratory with 4 switches, 3 routers and 2 workstations in order to test almost all layer 2/3 protocols that are related to network management traffic.
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