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hi shain/sudeep and rest of all plz answer these question
for help some one as soon as possible
what is stub area
what is transit area
let there are three area in ospf a0 a2 and a3 if a2 and a3
is coneted
through each other will they comnicate
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Answer Posted / shahin
Stub Area: Stub area is defined as area which can accept
intra-area routes (LSA 1 & LSA 2), Inter-area routes (LSA 3
& LSA 4) but don't accept any external routes (LSA 5) that
is redistributed in OSPF area. A backbone area will
advertise a default routes to a stub area or a network
summary LSA for the destination 0.0.0.0
Stub area limitation are -
a. Stub area can't include virtual links
b. Stub area can't include an ASBR.
c. Stubbiness must be configured on all routers in the area.
R1------R2-----R3
! ! !
! ! !
! ! !
NW1 NW2 NW3
R1
Interface IP Address Subnet Mask
S1/0 - 1.1.1.1 255.0.0.0
Fa 0/0 - 10.1.1.1 255.0.0.0
R2
Interface IP Address Subnet Mask
S 1/0 - 1.1.1.2 255.0.0.0
S1/1 - 2.2.2.1 255.0.0.0
Fa0/0 20.1.1.1 255.0.0.0
R3
Interface IP Address Subnet Mask
S1/0 - 2.2.2.2 255.0.0.0
Fa0/0 - 30.1.1.1 255.0.0.0
R1 configuration -
Router ospf 1
Network 1.1.1.1 0.0.0.0 area 0
Network 10.0.0.0 0.255.255.255 area 1
R2 Configuration -
Router ospf 1
Network 1.1.1.2 0.0.0.0 area0
Network 2.2.2.1 0.0.0.0 area2
Router eigrp100
Network 20.0.0.0
No auto-summary
Router ospf 1
Redistribute eigrp 100 metric 10 subnets
R3 Configuration -
Router ospf 1
Network 2.2.2.2 0.0.0.0 area2
Network 30.0.0.0 0.255.255.255 area2
Varification on Router3
R3#show ip route
O IA 1.0.0.0/8 [110/128] via 2.2.2.1, 00:01:08, Serial0
C 2.0.0.0/8 is directly connected, Serial0
O E2 20.0.0.0/8 [110/10] via 2.2.2.1, 00:00:03, Serial0
O IA 10.0.0.0/8 [110/129] via 2.2.2.1, 00:01:08, Serial0
C 30.0.0.0/8 is directly connected, Ethernet0
The output displays inter-area routes (O IA) and OSPF
external type 2 (O E2).
Now, Configure OSPF Area 1 as Stub.
R2
Router ospf 1
Area 1 stub
R3
Router ospf 1
Area 1 stub
After configuring stub, verify the routing table on R3.
R3#show ip route
O IA 1.0.0.0/8 [110/128] via 2.2.2.1, 00:00:03, Serial0
C 2.0.0.0/8 is directly connected, Serial0
O IA 10.0.0.0/8 [110/129] via 2.2.2.1, 00:00:03, Serial0
C 30.0.0.0/8 is directly connected, Ethernet0
O*IA 0.0.0.0/0 [110/65] via 2.2.2.1, 00:00:03, Serial0
The output displays default route and inter-area routes,
both designated with (OIA) in the
routing table.
Default route is denoted as (O* IA).
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