LSA 1 (Router LSA)
Generated by all routers in an area to describe their directly attached links (Intra-area routes).
These do not leave the area.
LSA 2 (Network LSA)
Generated by the DR of a broadcast or Nonbroadcast segment to describe the neighbors connected to
the segment. These do not leave the area.
LSA 3 (Network Summary LSA)
Generated by the ABR to describe a route to neighbors outside the area. (Inter-area routes)
LSA 4 (ASBR Summary LSA)
Generated by the ABR to describe a route to an ASBR to neighbors outside the area.
LSA 5 (AS External LSA)
Generated by ASBR to describe routes redistributed into the area. These routes appear as E1 or E2 in
the routing table. E2 (default) uses a static cost throughout the OSPF domain as it only takes the
cost into account that is reported at redistribution. E1 uses a cumulative cost of the cost reported
into the OSPF domain at redistribution plus the local cost to the ASBR.
LSA 6 (Multicast LSA)
Not supported on Cisco routers.
LSA 7 (NSSA External LSA)
Generated by an ASBR inside a NSSA to describe routes redistributed into the NSSA.
LSA 7 is translated into LSA 5 as it leaves the NSSA. These routes appear as N1 or N2
in the ip routing table inside the NSSA. Much like LSA 5, N2 is a static cost while N1
is a cumulative cost that includes the cost upto the ASBR.
LAB ON LSA TYPES:
Configuration of R1
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
ip cef
!
!
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.12.1 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
router ospf 1
log-adjacency-changes
network 1.1.1.1 0.0.0.0 area 1
network 10.1.12.0 0.0.0.3 area 0
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
R1#
R1#sh ip osp da
R1#sh ip ospf dat
R1#sh ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1115 0x80000004 0x00E182 2
2.2.2.2 2.2.2.2 995 0x80000004 0x00DF6F 4
10.1.34.1 10.1.34.1 535 0x80000004 0x0052A4 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 1.1.1.1 1111 0x80000001 0x0047EC
10.1.34.0 10.1.34.1 1058 0x80000001 0x009C08
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1115 0x80000001 0x00D351 1
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
10.1.12.0 1.1.1.1 1116 0x80000001 0x00C81C
10.1.23.0 1.1.1.1 1121 0x80000001 0x00D1C7
10.1.34.0 1.1.1.1 1060 0x80000001 0x00DA73
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.2 1.1.1.1 994 0x80000001 0x00836C
10.1.34.1 1.1.1.1 533 0x80000001 0x005237
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 999 0x80000001 0x002E64 0
4.4.4.4 10.1.34.1 519 0x80000001 0x009643 0
R2#sh run
Building configuration...
Current configuration : 1079 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
ip cef
!
!
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.12.2 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.23.1 255.255.255.252
clock rate 2000000
!
router ospf 1
log-adjacency-changes
redistribute rip metric 3333 subnets
network 10.1.12.0 0.0.0.3 area 0
network 10.1.23.0 0.0.0.3 area 0
!
router rip
version 2
network 2.0.0.0
no auto-summary
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
R2#sh ip os
R2#sh ip ospf data
R2#sh ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1205 0x80000004 0x00E182 2
2.2.2.2 2.2.2.2 1082 0x80000004 0x00DF6F 4
10.1.34.1 10.1.34.1 622 0x80000004 0x0052A4 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 1.1.1.1 1200 0x80000001 0x0047EC
10.1.34.0 10.1.34.1 1145 0x80000001 0x009C08
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 1082 0x80000001 0x002E64 0
4.4.4.4 10.1.34.1 602 0x80000001 0x009643 0
Generated by all routers in an area to describe their directly attached links (Intra-area routes).
These do not leave the area.
LSA 2 (Network LSA)
Generated by the DR of a broadcast or Nonbroadcast segment to describe the neighbors connected to
the segment. These do not leave the area.
LSA 3 (Network Summary LSA)
Generated by the ABR to describe a route to neighbors outside the area. (Inter-area routes)
LSA 4 (ASBR Summary LSA)
Generated by the ABR to describe a route to an ASBR to neighbors outside the area.
LSA 5 (AS External LSA)
Generated by ASBR to describe routes redistributed into the area. These routes appear as E1 or E2 in
the routing table. E2 (default) uses a static cost throughout the OSPF domain as it only takes the
cost into account that is reported at redistribution. E1 uses a cumulative cost of the cost reported
into the OSPF domain at redistribution plus the local cost to the ASBR.
LSA 6 (Multicast LSA)
Not supported on Cisco routers.
LSA 7 (NSSA External LSA)
Generated by an ASBR inside a NSSA to describe routes redistributed into the NSSA.
LSA 7 is translated into LSA 5 as it leaves the NSSA. These routes appear as N1 or N2
in the ip routing table inside the NSSA. Much like LSA 5, N2 is a static cost while N1
is a cumulative cost that includes the cost upto the ASBR.
LAB ON LSA TYPES:
Configuration of R1
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
ip cef
!
!
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.12.1 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
router ospf 1
log-adjacency-changes
network 1.1.1.1 0.0.0.0 area 1
network 10.1.12.0 0.0.0.3 area 0
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
R1#
R1#sh ip osp da
R1#sh ip ospf dat
R1#sh ip ospf database
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1115 0x80000004 0x00E182 2
2.2.2.2 2.2.2.2 995 0x80000004 0x00DF6F 4
10.1.34.1 10.1.34.1 535 0x80000004 0x0052A4 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 1.1.1.1 1111 0x80000001 0x0047EC
10.1.34.0 10.1.34.1 1058 0x80000001 0x009C08
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1115 0x80000001 0x00D351 1
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
10.1.12.0 1.1.1.1 1116 0x80000001 0x00C81C
10.1.23.0 1.1.1.1 1121 0x80000001 0x00D1C7
10.1.34.0 1.1.1.1 1060 0x80000001 0x00DA73
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
2.2.2.2 1.1.1.1 994 0x80000001 0x00836C
10.1.34.1 1.1.1.1 533 0x80000001 0x005237
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 999 0x80000001 0x002E64 0
4.4.4.4 10.1.34.1 519 0x80000001 0x009643 0
configuration of R2:
Building configuration...
Current configuration : 1079 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
ip cef
!
!
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.12.2 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.23.1 255.255.255.252
clock rate 2000000
!
router ospf 1
log-adjacency-changes
redistribute rip metric 3333 subnets
network 10.1.12.0 0.0.0.3 area 0
network 10.1.23.0 0.0.0.3 area 0
!
router rip
version 2
network 2.0.0.0
no auto-summary
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
R2#sh ip os
R2#sh ip ospf data
R2#sh ip ospf database
OSPF Router with ID (2.2.2.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1205 0x80000004 0x00E182 2
2.2.2.2 2.2.2.2 1082 0x80000004 0x00DF6F 4
10.1.34.1 10.1.34.1 622 0x80000004 0x0052A4 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 1.1.1.1 1200 0x80000001 0x0047EC
10.1.34.0 10.1.34.1 1145 0x80000001 0x009C08
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 1082 0x80000001 0x002E64 0
4.4.4.4 10.1.34.1 602 0x80000001 0x009643 0
configuration of R3:
!
hostname R3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
ip cef
!
!
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.34.1 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.23.2 255.255.255.252
clock rate 2000000
!
router ospf 1
log-adjacency-changes
area 2 nssa
network 10.1.23.0 0.0.0.3 area 0
network 10.1.34.0 0.0.0.3 area 2
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
R3#sh ip os
R3#sh ip ospf da
R3#sh ip ospf database
OSPF Router with ID (10.1.34.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 1436 0x80000004 0x00E182 2
2.2.2.2 2.2.2.2 1313 0x80000004 0x00DF6F 4
10.1.34.1 10.1.34.1 852 0x80000004 0x0052A4 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 1.1.1.1 1431 0x80000001 0x0047EC
10.1.34.0 10.1.34.1 1374 0x80000001 0x009C08
Router Link States (Area 2)
Link ID ADV Router Age Seq# Checksum Link count
4.4.4.4 4.4.4.4 839 0x80000004 0x00E908 2
10.1.34.1 10.1.34.1 840 0x80000005 0x00A32F 2
Summary Net Link States (Area 2)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 10.1.34.1 852 0x80000002 0x00B6CB
10.1.12.0 10.1.34.1 859 0x80000002 0x00B5BD
10.1.23.0 10.1.34.1 859 0x80000002 0x00B9EE
Type-7 AS External Link States (Area 2)
Link ID ADV Router Age Seq# Checksum Tag
4.4.4.4 4.4.4.4 850 0x80000001 0x00E00D 0
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
2.2.2.2 2.2.2.2 1320 0x80000001 0x002E64 0
4.4.4.4 10.1.34.1 838 0x80000001 0x009643 0
configuration of R4:
!
hostname R4
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
ip cef
!
!
!
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback1
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.34.2 255.255.255.252
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
router eigrp 100
network 4.0.0.0
no auto-summary
!
router ospf 1
log-adjacency-changes
area 2 nssa
redistribute eigrp 100 metric 4444 subnets
network 10.1.34.0 0.0.0.3 area 2
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
R4#sh ip os
R4#sh ip ospf da
R4#sh ip ospf database
OSPF Router with ID (4.4.4.4) (Process ID 1)
Router Link States (Area 2)
Link ID ADV Router Age Seq# Checksum Link count
4.4.4.4 4.4.4.4 842 0x80000004 0x00E908 2
10.1.34.1 10.1.34.1 844 0x80000005 0x00A32F 2
Summary Net Link States (Area 2)
Link ID ADV Router Age Seq# Checksum
1.1.1.1 10.1.34.1 857 0x80000002 0x00B6CB
10.1.12.0 10.1.34.1 857 0x80000002 0x00B5BD
10.1.23.0 10.1.34.1 857 0x80000002 0x00B9EE
Type-7 AS External Link States (Area 2)
Link ID ADV Router Age Seq# Checksum Tag
4.4.4.4 4.4.4.4 846 0x80000001 0x00E00D 0
------------thanx---
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