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I made the following diagram for the BGP FSM because the ones shown by Cisco in their Cisco Press books don’t accurately capture the RFC’s rules. I’ve marked the one-way transitions as red arrows, while the two-way transitions are blue. I’ve also added a noteworthy item that shows you can go directly from the Active …
Continue reading “Accurate BGP Finite State Machine (FSM) Diagram”
With code 9.7 released Cisco decided to add two VERY important features. Route based VPN with VTIs, and bridge groups! This article will show a quick configuration of a route based VPN with ASAs! Previously to do something like this you would need to build a GRE tunnel over IPSEC with a second router terminating …
First we’re going to be creating a eBGP session with IPv4 and then we will advertise routes for IPv6 Prefixes over that session. R2 is in AS 1. R3 is in AS 2. R2 has a L00pback interface with an IPv6 address of 2002:2::2/128 R3 has a L00pback interface with an IPv6 address of 2003:3::3/128 …
Continue reading “BGP – Advertising IPv4 and IPv6 in a single BGP session!”
As you may know BGP HAS to pick a best route, and that is the route that will be put into our global routing table. Recall that our IGPs have a maximum-paths command that state how many paths can be in the routing table? BGP supports the “maximum-paths” command, however it behaves differently than it …
Continue reading “BGP – How to configure basic Multipath/Load balancing”
The reason I decided to make this post is because all other MED/Metric changing tutorials out there only include an example of one prefix. I wanted to make one that looked more realistic. Before we begin let’s overview the BGP MED attribute: MED/Metric are synonymous MED influences how your eBGP neighbors should enter your autonomous …
Continue reading “BGP – Changing MED/Metric to Influence Inbound Routing with Lab Examples”
yes, I see I spelled Colorado wrong. In this topology: Denver is AS1 Chicago to Colorado is AS 2 Virginia and everything to the right is AS3 First we configure our links with /30s, then I give denver a lo0 of 1.1.1.1 and Chicago a l0 of 2.2.2.2, then configure eBGP between the …
Continue reading “BGP – Using the next-hop-self command to provide Transit”
