IP Routing Policy 121
3 Configure RIP on Switch C
[Switch C]rip
[Switch C-rip]network 117.102.0.0
[Switch C-rip]network 110.11.2.0
Troubleshooting RIP The Switch 4500 cannot receive the update packets when the physical connection
to the peer routing device is normal.
■ RIP does not operate on the corresponding interface (for example, the undo
rip work
command is executed) or this interface is not enabled through the
network command.
■ The peer routing device is configured to be in the multicast mode (for example,
the
rip version 2 multicast command is executed) but the multicast mode
has not been configured on the corresponding interface of the local Ethernet
Switch.
IP Routing Policy When a router distributes or receives routing information, it must implement
policies to filter the routing information so that it can receive or distribute only the
routing information that meets specified conditions. A routing protocol, such as
RIP, may need to import routing information discovered by other protocols to
enrich its routing knowledge. While importing the routing information, it must
import only the information that meets its conditions.
To implement a routing policy, you must define a set of rules by specifying the
characteristics of the routing information to be filtered. You can set the rules
based on such attributes as the destination address and source address of the
information. The rules can be set in advance and then used in the routing policy to
advertise, receive and import the route information.
The Switch 4500 supports three kinds of filters. The following sections introduce
these filters:
■ Route Policy
■ ACL
■ IP Prefix
Route Policy
A route policy is used to match some attributes with given routing information
and the attributes of the information will be set if the conditions are satisfied.
A route policy can comprise multiple nodes. Each node is a unit for match testing,
and the nodes will be matched in a sequence-number-based order. Each node
comprises a set of
if-match and apply clauses. The if-match clauses define the
matching rules and the matching objects are attributes of routing information. The
relationship of
if-match clauses for a node uses a series of Boolean “AND”
statements. As a result, a match is found unless all the matching conditions
specified by the
if-match clauses are satisfied. The apply clause specifies the
actions that are performed after the node match test concerning the attribute
settings of the route information.
The comparisons of different nodes in a route policy uses a Boolean “OR”
statement. The system examines the nodes in the route policy in sequence. Once
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