networks learned by one routing protocol to another. When the routing protocols share
information, all the devices on the network that have privileges can connect to each other.
Route redistribution appears simple on the surface. However, it can be loaded with
complications. Understanding how the Happy Routing network processes work and
interact is critical before implementing redistribution.
masks must be the same. RIP does not understand variable-length subnet masking. RIP
only accepts information about a route that has a subnet that is the same as its own
interface, or a mask that ends on a classful boundary. All OSPF routes that do not match
the 24-bit subnet mask are not redistributed into RIP. When redistributing an OSPF route
into RIP, include subnets. If subnets are omitted, subnetted routes are not included.
Include the RIP metric of hops. If no metric is included, 16 is entered, and RIP considers
the route unreachable. A default metric can be specified to designate the cost of all
redistributed routes in RIP updates. All routes redistributed into RIP will have this default
metric.
subnet masks must be the same. IGRP does not understand variable-length subnet
masking. IGRP only accepts information about a route that has a subnet that is the same
as its own interface, or a mask that ends on a classful boundary.
default, the composite metric is the sum of the segment delays and the lowest segment
bandwidth for a given route. Although the default value can be adjusted with the
number, and using a new AS number.