Configuring An Ospf Stub Area - 3Com MSR 50 Series Configuration Manual

958 C 58: OSPF C
HAPTER
Configuring an OSPF
Stub Area
ONFIGURATION
Network requirements
Figure 290 shows an AS is split into three areas, where all routers run OSPF.
RouterA and RouterB act as ABRs to forward routing information between areas.
RouterD acts as the ASBR, redistributing routes (static routes).
It is required to configure Area1 as a Stub area, reducing LSAs to this area without
route reachability interference.
Network diagram
Figure 290 OSPF Stub area configuration
Router A
Eth1/0
10.1.1.1 /24
S2 /1
10 .2.1.1/24
Eth1/0
Area 1
10.2.1.2 /24
Stub
Eth1/1
10.4.1.1/24
Router C
Configuration procedure
1 Configure IP addresses for interfaces (omitted)
2 Configure OSPF basic functions (in the previous example)
3 Configure RouterD to redistribute static routes
[RouterD] ip route-static 3.1.3.1 24 Ethernet 1/2 9.1.1.1
[RouterD] ospf
[RouterD-ospf-1] import-route static
[RouterD-ospf-1] quit
# Display ABR/ASBR information on RouterC
[RouterC] display ospf abr-asbr
OSPF Process 1 with Router ID 10.4.1.1
Type Destination
Intra 10.2.1.1
Inter 10.3.1.1
Inter 10.5.1.1
# Display OSPF routing table information on RouterC
[RouterC] display ospf routing
OSPF Process 1 with Router ID 10.4.1.1
Routing for Network
Destination
10.2.1.0/24
10.3.1.0/24
Area 0
Router B
Eth1/0
10 .1 .1.2/24
Area 2
Eth1/0
10 .5.1.1/24
Router D
Routing Table to ABR and ASBR
Area
0.0.0.1
0.0.0.1
0.0.0.1
Routing Tables
Cost Type NextHop
3 Transit 10.2.1.2
7 Inter 10.2.1.1
Eth1/1
10.3.1.1 /24
Eth1/0
10.3.1.2/24
ASBR
Cost Nexthop
3 10.2.1.1
5 10.2.1.1
7 10.2.1.1
AdvRouter
10.2.1.1
10.2.1.1
RtType
ABR
ASBR
ASBR
Area
0.0.0.1
0.0.0.1