Route Filtering; Route Summarization; Route Redistribution; Load Balancing - Cisco Nexus 3000 Series Configuration Manual

Chapter 7 Configuring RIP
S e n d d o c u m e n t c o m m e n t s t o n e x u s 3 k - d o c f e e d b a c k @ c i s c o . c o m
Figure 7-1
Router A
Router C learns about route X and advertises that route to router B. Router B in turn advertises route X
to router A, but sends a route X unreachable update back to router C.
By default, split horizon is enabled on all interfaces.

Route Filtering

You can configure a route policy on a RIP-enabled interface to filter the RIP updates. Cisco NX-OS
updates the route table with only those routes that the route policy allows.

Route Summarization

You can configure multiple summary aggregate addresses for a specified interface. Route summarization
simplifies route tables by replacing a number of more-specific addresses with an address that represents
all the specific addresses. For example, you can replace 10.1.1.0/24, 10.1.2.0/24, and 10.1.3.0/24 with
one summary address, 10.1.0.0/16.
If more specific routes are in the routing table, RIP advertises the summary address from the interface
with a metric equal to the maximum metric of the more specific routes.
Cisco NX-OS does not support automatic route summarization.
Note

Route Redistribution

You can use RIP to redistribute static routes or routes from other protocols. You configure redistribution
use a route policy to control which routes are passed into RIP. A route policy allows you to filter routes
based on attributes such as the destination, origination protocol, route type, route tag, and so on. For
more information, see
Whenever you redistribute routes into a RIP routing domain, Cisco NX-OS does not, by default,
redistribute the default route into the RIP routing domain. You can generate a default route into RIP,
which can be controlled by a route policy.
You also configure the default metric that is used for all imported routes into RIP.

Load Balancing

You can use load balancing to allow a router to distribute traffic over all the router network ports that are
the same distance from the destination address. Load balancing increases the utilization of network
segments and increases effective network bandwidth.
RIP with Split Horizon Poison Reverse
route x unreachable
Router B
route x
Chapter 11, "Configuring Route Policy Manager."
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
route x unreachable
Router C
route x
Information About RIP
route x
7-3