Cisco 350XG series Administration Manual page 381

IP Configuration: RIPv2
How Rip Operates on the Device
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
Filtering Routing Updates
You can filter incoming and outgoing routes for a given IP interface using two
Standard Access Lists - one for input and one for output.
The Standard Access List is a named, ordered list of pairs of IP prefix (IP address
and IP mask length) and action. The action can be deny or permit.
If an access list is defined, each route from the RIP message is checked against
the list starting from the first pair: if it matches the first pair and the action is permit,
the route is passed; if the action is deny, the route is not passed. If the route does
not match, the following pair is considered.
If there is no pair that the route matches, the deny action is applied.
Advertising Default Route Entries on IP Interfaces
The special address 0.0.0.0 is used for describing a default route. A default route is
used to avoid listing every possible network in the routing updates, when one or
more closely-connected routers in the system are prepared to transfer traffic to
the networks that are not listed explicitly. These routers create RIP entries for the
address 0.0.0.0, just as if it were a network to which they are connected.
You can enable the default route advertisement and configure it with a given
metric.
Redistribution Feature
The following type of routes exist and can be distributed by RIP:
• Connected—RIP routes that correspond to defined IP interfaces on which
RIP is not enabled (defined locally). By default, the RIP Routing Table only
includes routes that correspond to IP interfaces on which RIP is enabled.
• Static—Manually-defined (remote) routes.
You can determine whether static or connected routes are redistributed by RIP by
configuring the Redistribute Static Route or Redistribute Connected Route
feature, respectively.
These feature are disabled by default and can be enabled globally.
If these features are enabled, rejected routes are advertised by routes with a
metric of 16.
The route configurations can be propagated using one of the following options:
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