Route Policies
7705 SAR OS Router Configuration Guide 421
Figure 12: BGP Route Policy Diagram
Figure 13: OSPF Route Policy Diagram
BGP Route Policies
The Alcatel-Lucent implementation of BGP uses route policies extensively. The implied or
default route policies can be overridden by customized route policies. The default BGP
properties, with no route policies configured, behave as follows:
• accept all BGP routes into the RTM for consideration
• announce all used BGP learned routes to other BGP peers
• announce none of the IGP, static, or local routes to BGP peers
Learned BGP
routes from peers
Route
selection
Loc-RIB
RIB-out
RIB-in
20103
BGP export
route policy
BGP import
route policy
Non-BGP routes are taken
from RTM and exported to BGP
RTM signals which
routes are used
Submit best
BGP routes
Reject
RTM
Inject External OSPF LSAs
OSPF
route
table
RTM
20104
LSDB
SPF
OSPF export
route policy
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