105
Routing for ASEs
Destination Cost Type Tag NextHop AdvRouter
3.1.2.0/24 1 Type2 1 10.3.1.1 10.4.1.1
Total Nets: 6
Intra Area: 2 Inter Area: 3 ASE: 1 NSSA: 0
Configuring OSPF to advertise a summary route
Network requirements
As shown in
:
•
Switch A and Switch B are in AS 200, which runs OSPF.
•
Switch C, Switch D, and Switch E are in AS 100, which runs OSPF.
An eBGP connection is established between Switch B and Switch C. Switch B and Switch C are
configured to redistribute OSPF routes and direct routes into BGP and BGP routes into OSPF.
Switch B is configured with route summarization and advertises only the summary route 10.0.0.0/8 to
reduce Switch A's routing table size.
Figure 40
Network diagram
Configuration procedure
1.
Configure IP addresses for interfaces. (Details not shown)
2.
Configure OSPF basic functions.
# Configure Switch A.
<SwitchA> system-view
[SwitchA] ospf
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 11.2.1.0 0.0.0.255
