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498 C
HAPTER
19: O
PEN
S
HORTEST
P
ATH
F
IRST
(OSPF) R
OUTING
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When you specify RIP or static as the origin protocol, you can specify
the source address of the router that originated the RIP or static route.
For example, you can define an export policy to reject (that is, not
advertise) all statically defined routes, in which case you specify the
local router’s ID as the source address.
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The route or routes to which you want the policy to apply, specified by
a network address and subnet mask.
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The action that you want the router to take:
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Accept — The specified route is placed in external link state
advertisements and propagated over the network.
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Reject — The specified route is not placed in external link state
advertisements and as a result is not propagated over the network.
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For export policies that define routes to be advertised in external LSAs,
you can define a new cost metric value for the route, or you can adjust
the existing cost metric using one of these operators:
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+ adds the specified number to the existing cost metric
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- subtracts the specified number from the existing cost metric
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* multiplies the specified number by the existing cost metric
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/ divides the existing cost metric by the specified number
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% modulo divides the existing cost metric by the specified number
and returns the remainder
The routes are then advertised with the cost metric as defined by the
export policy.
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You can choose to advertise the route as a Type 1 or a Type 2 external
cost metric.
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In case multiple policies match the same route, you can also assign an
administrative weight to define an order of precedence.