Dell Networking 2024 Reference Manual page 1193

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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 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 Networking N3000 and N4000 platforms, the ECMP hashing

support utilizes Enhanced hashing mode, which provides improved load-

balancing performance. ECMP hashing on these platforms has the following

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

Dell Networking supports the flooding capability of opaque LSAs. Dell

Networking cannot originate or process opaque LSAs. In the past, the

capability to flood opaque LSAs was disabled by default.

OSPF Commands

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