3Com CoreBuilder 3500, Implementation Manual

Page: 413 / 592

OSPF Routing Policies 413
Export Example 2: Prohibit Advertisement of Static Address
The policy defined in Table 53 prohibits a router from advertising any
static route originating from router 131.141.127.7.
Although the router can learn all static routes that originate from router
131.141.127.7, this policy prohibits any of those routes from being
placed in external link advertisements.
Export Example 3: Prohibit Advertisement of RIP Routes
The policy defined in Table 54 prohibits an autonomous system boundary
router from advertising imported RIP route 138.140.9.0 originates from
router 131.141.126.9.
Although the router can add the 138.140.9.0 route to its routing table,
this policy prohibits the boundary router from migrating the route from its
routing table to its link state database. As a result, the route is not
propagated over the network.
Table 53 Export Policy to Reject Static Routes
Policy Field Definition
Policy type export
Origin protocol sta
Source address 131.141.127.7
Route address 0.0.0.0
Policy action reject
Administrative weight 1
Table 54 Export Policy to Reject RIP Routes
Policy Field Definition
Policy type export
Origin protocol rip
Source address 131.141.126.9
Route address 138.140.9.0
Route subnet mask 255.255.255.0
Policy action reject
Administrative weight 1