Ubiquiti ERLite-3, User Manual

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Chapter 5: Routing Tab EdgeRouter ™ Lite User Guide
Ubiquiti Networks, Inc.
Black Hole
• Route type The black hole route drops unwanted traffic.
• Destination network The IP address and subnet mask
are displayed in slash notation.
• Distance (1-255) Enter the administrative distance. If
there are identical routes from different sources (such
as static, RIP, and OSPF), the EdgeRouter compares the
routes and uses the route with the lowest distance.
• Enable Check the box to enable the route.
Click Save to apply your changes.
OSPF
Using Link State Advertisements, routers communicate
with each other when there is a router or link status
change. Each router maintains the information in a
database, which is used to create and update a network
map from the router’s point of view. Each router then uses
the map to build and update a routing table.
Router
Router ID Enter the IP address that identifies a specific
router in an OSPF network. In OSPF, the highest Router ID
determines which router is the Designated Router (DR),
which distributes updates to the other OSPF routers.
Click Save to apply your changes, or click Delete OSPF
to remove the Router , Redistribution , and Area settings
( Interfaces settings are retained).
Redistribution
A single router can use multiple routing protocols, such
as OSPF and RIP, which use incompatible metrics. It
must reconcile information from multiple protocols to
determine which route to use for a specific destination
network. You can change the metrics of the distributed
protocol to create protocol compatibility.
Redistribute connected If enabled, the EdgeRouter
connects an OSPF area to a network using a different
routing protocol and redistributes the other protocol’s
directly connected routes into the OSPF area. These routes
become external OSPF routes.
- Metric If there are multiple routes to the same
destination, OSPF uses the metric to select a route
for the routing table. Assign a cost value to the
redistributed connected routes. The EdgeRouter can
then use this metric to compare these routes to other
OSPF routes.
Redistribute static If enabled, the EdgeRouter connects
an OSPF area to a network using a different routing
protocol and redistributes the other protocol’s static
routes into the OSPF area. These routes become external
OSPF routes.
- Metric If there are multiple routes to the same
destination, OSPF uses the metric to select a route
for the routing table. Assign a cost value to the
redistributed static routes. The EdgeRouter can then
use this metric to compare these routes to other OSPF
routes.
Announce default route If enabled, the EdgeRouter
communicates the default route to the other routers of
the OSPF network, eliminating the need to configure
the default route on the other routers. The default route
connects the OSPF network to an outside network.