Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.7 - Page 1718

• Configured Statically: If an operator configures multiple static routes to the exact same destination but with different next hops, those routes are treated as a single route with two next hops. • Learned Dynamically: Routing protocols can learn ECMP routes. For example, if OSPF is configured on both links connecting Router A to Router B with interface addresses 10.1.1.2 and 10.1.2.2 respectively, and Router B advertises its connection to 20.0.0.0/ 8, then Router A computes an OSPF route to 20.0.0.0/8 with next hops of 10.1.1.2 and 10.1.2.2. Dell EMC Networking routing stores static and dynamic routes in a single combined routing table. RTO accepts ECMP routes, but it is important to understand that RTO does not combine routes from different sources to create ECMP routes. Referring to the above configuration, assume OSPF is only configured on the 10.1.1.2 Router B interface connecting Router A and Router B. Then on Router A, OSPF reports to RTO a route to 20.0.0.0/8 with a next hop of 10.1.1.2. If the user configures a static route to 20.0.0.0/8 with a single next hop of 10.1.2.2, RTO does NOT combine the OSPF and static route into a single route to 20.0.0.0/8 with two next hops. All next hops within an ECMP route must be provided by the same source. On Dell EMC Networking N3000-ON, N3100, and N3200-ON platforms, the ECMP hashing support utilizes Enhanced hashing mode, which provides improved load-balancing performance. ECMP hashing on these platforms has the following features: • MODULO-N operation based on the number N of next hops in the route. • Packet attributes selection based on the packet type. For IP packets, the following fields are used: Source IP address, Destination IP address, TCP/UDP port, IPv4 Protocol, IPv6 next header. Forwarding of OSPF Opaque LSAs Enabled by Default Dell EMC Networking supports the flooding capability of opaque LSAs. Dell EMC Networking cannot originate or process opaque LSAs. In the past, the capability to flood opaque LSAs was disabled by default. Layer 3 Routing Commands 1718