i have 3 routers( 1601-Area0,2610-Area0 and Area 10,1603-Area 10 and Area 11):
Cisco1601#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0 A.B. C.D YES NVRAM up up
Loopback0 131.108.2.1 YES manual up up
Loopback1 131.108.3.1 YES manual up up
Loopback2 131.108.4.1 YES manual up up
Loopback3 131.108.5.1 YES manual up up
Loopback4 131.108.6.1 YES manual up up
Loopback5 131.108.7.1 YES manual up up
Loopback6 131.108.8.1 YES manual up up
Loopback7 131.108.9.1 YES manual up up
Loopback8 131.108.10.1 YES manual up up
Loopback9 131.108.11.1 YES manual up up
Loopback10 131.108.12.1 YES manual up up
Loopback11 131.108.13.1 YES manual up up
Loopback12 131.108.14.1 YES manual up up
Loopback13 131.108.15.1 YES manual up up
Serial0 unassigned YES NVRAM up up
Serial0.1 192.168.1.77 YES NVRAM up up
Serial1 unassigned YES NVRAM up up
Serial1.1 192.168.100.2 YES NVRAM up up
----
From 1601 config-
!
router ospf 1
log-adjacency-changes
network 131.108.0.0 0.0.255.255 area 0
network 192.168.100.0 0.0.0.255 area 0
!
--------------
--------------
2610#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0/0 A.B.C.1 YES NVRAM up up
Serial0/0 unassigned YES NVRAM up up
Serial0/0.1 A.B.C.22 YES NVRAM up up
Serial0/0.2 192.168.100.1 YES NVRAM up up
Serial0/0.3 unassigned YES unset up up
Loopback0 192.168.18.1 YES manual up up
-----------------
From 2610 config-
!
router ospf 2
log-adjacency-changes
area 0 range 131.108.0.0 255.255.224.0
area 10 virtual-link 192.168.16.1
network 192.168.18.0 0.0.0.255 area 10
network 192.168.100.0 0.0.0.255 area 0
network A.B.C.0 0.0.0.255 area 10
!
----------------
----------------
c1603#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Ethernet0 A.B.C.111 YES NVRAM up up
Loopback3 192.168.16.1 YES manual up up
---------------
!
router ospf 3
network 192.168.16.0 0.0.0.255 area 11
network A.B.C.0 0.0.0.255 area 10
area 10 virtual-link A.B.C.22
!
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As you can see i've made OSPF summarization at 2610 for routes from 1601 ( because 2610 ABR). But that i still see in the routing table:
2610#sh ip route ospf
131.108.0.0/16 is variably subnetted, 15 subnets, 2 masks
O 131.108.14.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.15.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.12.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.13.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.10.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.11.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.8.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.9.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.6.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.7.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.4.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.5.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.2.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.3.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
O 131.108.0.0/19 is a summary, 00:12:50, Null0
192.168.16.0/32 is subnetted, 1 subnets
O IA 192.168.16.1 [110/11] via A.B.C.111, 00:12:50, Ethernet0/0
-----------
Why i have
O 131.108.0.0/19 is a summary, 00:12:50, Null0
I suppose that it must be
O 131.108.0.0/19 is a summary, 00:12:50, Serial0/0.2
instead 13 lines like
O 131.108.5.1/32 [110/782] via 192.168.100.2, 00:12:50, Serial0/0.2
Why?
