Below is the topology in case you forgot what it looks like: Simple Cisco MPLS core diagram This will allow the CE router to advertise any routes via eBGP to the PE which will then, in turn, advertise the prefixes over the core to the other PE and CE. Just like the Juniper scenario, when you make a connection between the Customer Edge (CE) and Provider Edge (PE) router, you use an external Border Gateway Protocol (eBGP) connection to exchange routes. Provider Edge Customer Virtual Route Forwarder This will allow routing between R7 (CE-A) and R8 (CE-A)’s loopback address over the MPLS core. Now that the basics are in working order (remember, the simple core does not do anything special such as resiliency), let’s move on to the next step which is to create a Layer 3 VPN (元VPN) for our customer. In the last post, Simple Cisco MPLS Core w/ 元VPN (Part 1), we created a simple MPLS core using Cisco CSR1000v routers which was similar to the Simple Juniper MPLS Core w/ 元VPN (Part 1).
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