My topo：
Ros-1<–>Ros-2
Ros-2<–>Ros-3
Ros-3<–>Ros-1
all of them is OSPF neighbor and state=“Full”
In Ros-1 have an loopback0(IP is 10.10.10.10/32)
and it has been network in Area12
R1:
[admin@Ros-1] > export
/interface bridge
add name=loopback0
/routing ospf area
add area-id=0.0.0.12 name=A12
add area-id=0.0.0.13 name=A13
/routing ospf instance
set [ find default=yes ] router-id=1.1.1.1
/ip address
add address=10.1.12.1/24 interface=ether1 network=10.1.12.0
add address=10.1.13.1/24 interface=ether2 network=10.1.13.0
add address=10.10.10.10 interface=loopback0 network=10.10.10.10
/routing ospf network
add area=A12 network=10.1.12.0/24
add area=A13 network=10.1.13.0/24
add area=A12 network=10.10.10.10/32
/system identity
set name=Ros-1
R2:
[admin@Ros-2] > export
/routing ospf area
add area-id=0.0.0.12 name=A12
/routing ospf instance
set [ find default=yes ] router-id=2.2.2.2
/ip address
add address=10.1.12.2/24 interface=ether1 network=10.1.12.0
add address=10.1.23.2/24 interface=ether2 network=10.1.23.0
/routing ospf network
add area=A12 network=10.1.12.0/24
add area=backbone network=10.1.23.0/24
/system identity
set name=Ros-2
R3:
[admin@Ros-3] > export
/routing ospf area
add area-id=0.0.0.13 name=A13
/routing ospf instance
set [ find default=yes ] router-id=3.3.3.3
/ip address
add address=10.1.23.3/24 interface=ether2 network=10.1.23.0
add address=10.1.13.3/24 interface=ether1 network=10.1.13.0
/routing ospf network
add area=A13 network=10.1.13.0/24
add area=backbone network=10.1.23.0/24
/system identity
set name=Ros-3
check /ip route print on Ros-3
[admin@Ros-3] > ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
0 ADo 10.1.12.0/24 10.1.23.2 110
1 ADC 10.1.13.0/24 10.1.13.3 ether1 0
2 ADC 10.1.23.0/24 10.1.23.3 ether2 0
3 ADo 10.10.10.10/32 10.1.23.2 110
R3 can reach 10.10.10.10/32 from 10.1.23.2(R2)
/routing ospf area-border-router print on R3
[admin@Ros-3] > /routing ospf area-border-router print
# AREA ROUTERID STATE GATEWAY COST
0 backbone 2.2.2.2 intra-area 10.1.23.2 10
1 backbone 3.3.3.3 intra-area 0
2 A13 1.1.1.1 intra-area 10.1.13.1 10
3 A13 3.3.3.3 intra-area 0
[admin@Ros-3] > /routing ospf lsa print detail where id=10.10.10.10
instance=default area=backbone type=summary-network id=10.10.10.10 originator=2.2.2.2 sequence-number=0x80000003 age=677 checksum=0x26F0 options="E" body=
netmask=255.255.255.255
metric=20
instance=default area=A13 type=summary-network id=10.10.10.10 originator=1.1.1.1 sequence-number=0x80000003 age=676 checksum=0xDF45 options="E" body=
netmask=255.255.255.255
metric=10
instance=default area=A13 type=summary-network id=10.10.10.10 originator=3.3.3.3 sequence-number=0x80000003 age=542 checksum=0x6C9C options="E" body=
netmask=255.255.255.255
metric=30
[admin@Ros-3] > /routing ospf lsa print detail where id=1.1.1.1
instance=default area=A13 type=router id=1.1.1.1 originator=1.1.1.1 sequence-number=0x80000005 age=1545 checksum=0x1FEB options="E" body=
flags=BORDER
link-type=Transit id=10.1.13.1 data=10.1.13.1 metric=10
and when Ros-3 <---->Ros-2 is down
[admin@Ros-3] > ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme, B - blackhole, U - unreachable, P - prohibit
# DST-ADDRESS PREF-SRC GATEWAY DISTANCE
0 ADo 10.1.12.0/24 10.1.13.1 110
1 ADC 10.1.13.0/24 10.1.13.3 ether1 0
2 ADo 10.10.10.10/32 10.1.13.1 110
R3 can reach 10.10.10.10/32 from 10.1.13.1(R1)
1.1.1.1 (Ros-1) is ABR? its should send a LSA-3?
Its unattached BackBone Area.
in RFC2328
Area border routers
A router that attaches to multiple areas. Area border
routers run multiple copies of the basic algorithm, one copy
for each attached area. Area border routers condense the
topological information of their attached areas for
distribution to the backbone. The backbone in turn
distributes the information to the other areas.
It is a bug?
[admin@Ros-3] > system resource print
uptime: 3h1m40s
version: 6.36.4 (bugfix)
build-time: Oct/05/2016 11:24:22
free-memory: 75.9MiB
total-memory: 96.1MiB
cpu: QEMU
cpu-count: 1
cpu-frequency: 2793MHz
cpu-load: 2%
free-hdd-space: 69.6MiB
total-hdd-space: 95.3MiB
write-sect-since-reboot: 5320
write-sect-total: 5321
architecture-name: x86_64
board-name: CHR
platform: MikroTik