In highload cloud networks there is so much traffic that even 100G/400G port speeds do not suffice, so sharing the load over multiple links is the only feasible solution.
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For any network that provides routing services to customers it is important to segregate them in different virtual topologies that don’t interfere with each other.
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PE-CE routing in MPLS L3VPN is an important topic which confuses a lot of people. Thanks to EVPN, it is now used not only in ISP but also DC networks.
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Packet duplication wastes bandwidth and can lead to significant network performance degradation or even outages.
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Fast convergence after failures has always been an important part of ISP network design.
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Recently I stumbled upon the IETF draft about PIM Designated Router Load Balancing (DRLB) and it reminded me of something absolutely barbaric.
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This story is about the importance of remembering networking fundamentals when dealing with advanced routing topics.
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Yes, this has already happened to many networks across the globe. And for sure will happen again. Maybe to your network?
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