https://songkou.github.io/tags/ecmp/Recent content in ECMP on Council of ElrondHugoenSat, 11 Nov 2023 12:00:00 +0800https://songkou.github.io/posts/pim-dr-assert-multicast-ecmp/Sat, 11 Nov 2023 12:00:00 +0800https://songkou.github.io/posts/pim-dr-assert-multicast-ecmp/<p>Several questions come up whenever two PIM routers share a receiver VLAN over equal-cost paths: if the <strong>DR</strong> and the <strong>Assert winner</strong> are different routers, which one forwards the multicast? Does a single stream ever spread its packets across both paths? If you change nothing, do 500 streams split evenly across the two routers—or does that take configuration? And what changes if the switch becomes a Layer 3 router? This post works through each, with the underlying PIM mechanics and a clear line between what the standards mandate and what is vendor-specific.</p>