Local Preference Part 2: Configuring the “Some but not all” local preference attribute, behaviors, and explanations!

Same Topology, only this time I added a second logical network between R3 and R4 by creating 2 loopback interfaces in the same subnet 210.3.3.0 /24, and removed the previous "All or none" configuration for Local Preference. So first I want to review R2 and R1 to see if their ip bgp tables look correct: … Continue reading Local Preference Part 2: Configuring the “Some but not all” local preference attribute, behaviors, and explanations!

The Local Preference attribute explained, and the ‘All or nothing’ way of configuring it and behaviors explained!

So as can be seen, once again we've ditched the NBMA as this Topology of a shared Ethernet segment will better illustrate Local Preference explanation, behaviors, etc. ***For labbing example purposes I want to point out there is another link in the above Topology, R3-R4 is connected by the Fa0/1 link on the network 172.12.34.0 … Continue reading The Local Preference attribute explained, and the ‘All or nothing’ way of configuring it and behaviors explained!

BGP – The Multi-Exit Discriminator (MED) / Metric explained, configured, and we see some old friends ACL’s and Route-Maps to help accomplish the goal!

So as can be seen we have no NBMA in this topology, only Serial Links and an Ethernet segment, which almost makes feel naked without a Frame-Switch in there somewhere. So to begin, my last post included on the tail end a "sh ip bgp" to demonstrate something with a bunch of loopbacks being advertied … Continue reading BGP – The Multi-Exit Discriminator (MED) / Metric explained, configured, and we see some old friends ACL’s and Route-Maps to help accomplish the goal!

BGP Well-Known Mandatory attributes explained, Best-Path explained, configured, and VERY important details!

^ I created this mid-session, but put it here as well as I like to illustrate the struggle at the beginning of the post 🙂 There are 3 well-known and mandatory attributes a BGP Speaker includes in updates to other BGP Speakers, that they must know how to speak (or they aren't speaking BGP) which … Continue reading BGP Well-Known Mandatory attributes explained, Best-Path explained, configured, and VERY important details!

BGP Attribute Intro – Foundational information that you MUST KNOW before getting into BGP attributes!!!

In my first post with BGP, when I said the key to success with BGP is knowing the "Attributes" of it, specifically which are well-known and which are optional. This is VERY important information to get a foundation understanding of BGP attributes. These are the 4 types of Attributes, the attributes themselves, and explanation below: … Continue reading BGP Attribute Intro – Foundational information that you MUST KNOW before getting into BGP attributes!!!