Dell Networking 2048, Справочное руководство

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OSPF Commands
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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
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 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.
2CSNXXX_SWUM200.book Page 1193 Tuesday, December 10, 2013 1:22 PM