The Equal Cost Multipath (ECMP) feature supports and complements the IS-IS protocol.
With ECMP, the switch can determine multiple equal-cost paths to the same destination prefix.
You can use multiple paths for load sharing of traffic. These multiple paths allow faster convergence to other active paths in case of network failure. By maximizing load sharing among equal-cost paths, you can use your links between routers more efficiently when sending IP and IPv6 traffic. Equal Cost Multipath is formed using routes from the same protocol.
The number of multiple paths a switch can support differs by hardware platform. For more information about feature support, see Fabric Engine Release Notes.