Some trivia facts: Basic eBGP configuration: R1:router bgp 1 neighbor 1.1.12.2 remote-as 2 network 1.1.12.0 mask 255.255.255.0 network 10.1.1.1 mask 255.255.255.255 R2router bgp 2 neighbor 1.1.12.1 remote-as 1 network 1.1.12.0 mask 255.255.255.0 network 10.1.1.2 mask 255.255.255.255 Basic iBGP configuration: R1:router bgp 1 neighbor 1.1.12.2 remote-as 1 network 1.1.12.0 mask 255.255.255.0 network 10.1.1.1 mask 255.255.255.255 R2:routerContinue reading “1.5.a IBGP and EBGP peer relationships”
Tag Archives: BGP
3.1.b ii MP-BGP VPNv4/VPNv6
Since I covered VPNv4 pretty thoroughly in the previous post (3.1.b i), I’m going to stick to just VPNv6 here. You basically have two options: tunnel your IPv6 traffic from your CE routers using something like GRE, or use IPv6 + Label on the PE routers. For this labbing exercise, I’m going to focus onContinue reading “3.1.b ii MP-BGP VPNv4/VPNv6”
3.1.b iii Extranet (route leaking)
The focus here is setting the two customers up to be able to talk to each other. At the most basic level, we can use the Route Targets. For simplicity’s sake, I’m going to add a second loopback prefix that’s unique for each customer. Otherwise we’d need to do Twice NAT, which NATs out theContinue reading “3.1.b iii Extranet (route leaking)”
3.1.b i PE-CE routing
Whatever routing protocol is running between the PE and CE will need to be redistributed into BGP, since BGP is the only protocol that supports the VPNv4 routing table. The BGP routes will also need to be redistributed into the PE/CE routing protocol. From the PE perspective, we’ll need the VRFs set up on theContinue reading “3.1.b i PE-CE routing”
Blueprint 1.5 BGP: 1.5.b Path Selection
1.5.b i: Attributes There are a million resources out there that will explain BGP attributes and path selection better than I can, but I’m doing this for my own purposes and will try to phrase it so I’m able to easily remember it when I come back to review. I recommend you skip this entryContinue reading “Blueprint 1.5 BGP: 1.5.b Path Selection”
Blueprint 1.5 BGP: 1.5.e ii Aggregation, as-set
A quick run through on route summarization with BGP.Resources:Video: Routing & Switching – BGP | Lab Minutes AGGREGATION The CIDR Report: See what a difference aggregation can make.https://bgp.potaroo.net What’s the difference between aggregation and summarization? It seems like we’re just doing summarization here!According to TCP/IP, Volume II, they’re the same thing. They used to beContinue reading “Blueprint 1.5 BGP: 1.5.e ii Aggregation, as-set”
Blueprint 1.5 BGP: 1.5.c iii Outbound Route Filtering
1.5.c iii Outbound Route Filtering I’m doing some brief route filtering labbing today. The resources I’m using are:LabMinutes.comVideo: Routing & Switching – BGP | Lab Minutes Routing TCP/IP, Volume II: CCIE Professional Development, Second Editionhttps://learning.oreilly.com/library/view/routing-tcpip-volume/9780134192772/ From the section: Filtering Routes by NLRI (Network Layer Reachability Information) “IOS provides two tools for per-NLRI route filtering: DistributeContinue reading “Blueprint 1.5 BGP: 1.5.c iii Outbound Route Filtering”
Oscorp Labs 