Sketches of IP, Routing, Internet, Security and Life!
Reading through the well-written CCDE Study Guide book by Marwan Al-shawi, came to a section about having BGP as the Enterprise Core Routing Protocol and its possible Design models. To make it a little bit brighter to myself, I’m gonna explain them in a different way with different diagrams and matrix based on my own design experience with these … Continue reading “Enterprise Core Routing Design Models with BGP”
From the BGP Design point of view (HLD), there are four options to manipulate the inbound traffic, MED, AS-path prepending, using communities, and breaking aggregated routes. MED This is not really useful, as it has to meet some conditions: The AS-path of learned routes should be identical. Thus, this could be only useful when multihoming … Continue reading “BGP – Controlling the Entry Point (HLD)”
Below topology was used for this post, and all the configuration happened on two Cisco CSR1000v BGP Selective Next-hop Route filtering Imagine that you want to accept routes only from peers, which the route covering the next-hop passes specific conditions, such as prefix-length, or protocol. In the following configuration I will only accept routes from … Continue reading “Advanced Cisco BGP features: Selective Next-hop”
Below topology was used for this post, and all the configuration happened on two Cisco CSR1000v BGP Nonstop Forwarding During normal NSF operation, CEF on the active RP synchronizes its current FIB and adjacency databases with the FIB and adjacency databases on the standby RP While switching over, the traffic is depended on CEF, once … Continue reading “Advanced Cisco BGP features: NSF”
Below topology was used for this post, and all the configuration happened on two Cisco CSR1000v Bidirectional Forwarding Detection for BGP I have just one note here. BFD can’t be enabled simultaneously with NSF for BGP. Even for other protocols, extreme care should be taken while implementing BFD with NSF. Depending on the platform, there … Continue reading “Advanced Cisco BGP features: BFD”
