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CCNP Routing and Switching

Spanning Tree BPDU Format

Let’s explore the Spanning Tree Protocol BPDU format. Bridges exchange BPDUs encapsulated into Ethernet frames. There are two types of BPDUs: Configuration BPDU TCN BPDU Spanning Tree BPDU format : what does it look like in an Ethernet Frame? Let’s ... Read More »

Spanning Tree BPDU Filter Notes

There are two seperate ways to configure it: – globally: (config)#spanning-tree portfast bpdufilter default + enables BPDU filter on all portfast interfaces + kicks them out of portfast if they receive a BPDU – per portfast interface: (config-if)#spanning-tree bpdufilter enable ... Read More »

Full Duplex Issue on IOL


Trying to configure duplex settings under an IOL switch interface can be a pain in the ass, especially when you are practicing RSTP and you need to have point-to-point links. You do “show spanning-tree” and you see that your interfaces ... Read More »

Cisco Switch 802.1x configuration

Here is the Cisco switch 802.1x configuration that worked for me in my home lab. Line 131: activates AAA lines 134 – 135: defining the Radius server group Lines 164 – 166: defining the Radius server and the secret key. Line ... Read More »

OSPF Route Filtering


In this article, we are going to learn how to filter routes in OSPF. We will learn how to do that within an area, and between areas. Network topology We will use the following topology. Everything is done in GNS3. I ... Read More »

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