•
<A.B.C.D>/<len>
eq
<E>
•
<A.B.C.D>/[<len>..<E>]
(if
<len>
is
lesser
than
<E>
)
•
<A.B.C.D>/[<E>..<len>]
(if
<len>
is
greater
than
<E>
)
rd-set
An rd-set is used to create a set with route distinguisher (RD) elements. An RD set is a 64-bit value prepended
to an IPv4 address to create a globally unique Border Gateway Protocol (BGP) VPN IPv4 address.
You can define RD values with the following commands:
• a.b.c.d:m:*—BGP VPN RD in IPv4 format with a wildcard character. For example, 10.0.0.2:255.255.0.0:*.
• a.b.c.d/m:n—BGP VPN RD in IPv4 format with a mask. For example, 10.0.0.2:255.255.0.0:666.
• a.b.c.d:** —BGP VPN RD in IPv4 format with a wildcard character. For example, 10.0.0.2:255.255.0.0.
• a.b.c.d:n— BGP VPN RD in IPv4 format. For example, 10.0.0.2:666.
• asn:*— BGP VPN RD in ASN format with a wildcard character. For example, 10002:255.255.0.0.
• asn:n—BGP VPN RD in ASN format. For example, 10002:666.
The following is an example of an rd-set:
rd-set rdset1
10.0.0.0/8:*,
10.0.0.0/8:777,
10.0.0.0:*,
10.0.0.0:777,
65000:*,
65000:777
end-set
Routing Policy Language Components
Four main components in the routing policy language are involved in defining, modifying, and using policies:
the configuration front end, policy repository, execution engine, and policy clients themselves.
The configuration front end (CLI) is the mechanism to define and modify policies. This configuration is then
stored on the router using the normal storage means and can be displayed using the normal configuration
show commands.
The second component of the policy infrastructure, the policy repository, has several responsibilities. First,
it compiles the user-entered configuration into a form that the execution engine can understand. Second, it
performs much of the verification of policies; and it ensures that defined policies can actually be executed
properly. Third, it tracks which attach points are using which policies so that when policies are modified the
appropriate clients are properly updated with the new policies relevant to them.
The third component is the execution engine. This component is the piece that actually runs policies as the
clients request. The process can be thought of as receiving a route from one of the policy clients and then
executing the actual policy against the specific route data.
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
391
Implementing Routing Policy
rd-set
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