In this post, let’s understand hard drive operation and try to find a methodology (procedure) to troubleshoot it (and heal it if needed). Lab setup Let’s describe in detail our “simple” setup. for the purpose of our test we mount this setup: PC + USB to SATA adapter + Seagate 1T HDD. The most basic…
In this blog, we’ll explore the operation of IGP interior routing protocol EIGRP over vNET trunks (another way to say networking trunking similar to vlan trunks used in L2 network by switches to trunks multiple traffics from different vlans into the same physical link) Little introduction New IOS release 15.x introduced Easy Virtual Network (EVN)…...
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Let’s put into play AS-Override feature in BGP: see when it applies and how it works. Introduction First, AS-Override feature applies to sites that have the same AS number but are linked by another different domain with different AS number, as in the next figure. In our example AS number 1 has neighborship (E-BGP links)…...
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In this blog, we’ll discuss the operation of OSPF dynamic routing protocol in a specific case where all participating routers share the same LAN Ethernet broadcast network and are configured as point-to-point OSPF network. Introduction In the first part, we present the lab setup and details the routers configuration. In the second part, we analyse…...
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In this blog, we study how DUAL route FSM Processes EIGRP Queries. Introduction Let’s recall that EIGRP is one of the so called IGP routing protocols. IGP stands for interior routing protocols as opposed to EGP or exterior routing protocols. In addition EIGRP is a hybrid as it borrows some similarities to distance-vector and link-state…...
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This post is part of a series of posts about dynamic routing protocols and especially RIP. We’ll try to get a deep understanding of its operation and function as an introductory to dynamic routing logic in general. You’ll see that what we think easy may hide an incrementing complexity… A little introduction Before we start…
