WB1 6.2 看一下 Rack1R5#show ip ospf database LSA的解釋

LSA-1 (Router Link) 同一個Area中所有的Router所產生的LSA-1
LSA-2 (Net Link States) 同一個Area的DR Router所產生的LSA-2
LSA-3 (Summary Net Link) 僅由ABR所產生的Network Summary LSA

Once adjacency is established in area 0, Inter-Area routing advertisements can be propagated throughout the entire topology. This is due to the fact that R1, R2, R3, R4, and R5 are now ABRs, and can originate the Network Summary LSA (LSA 3) describing Inter-Area routes to the other neighbors in their attached areas.
(LSA 3) describing Inter-Area routes to the other neighbors in their attached areas.

From the show ip ospf database output on R5 the Summary Net link States (Area 0) shows ABRs that are advertising information from other areas into area 0.

For example R2 is advertising the link 192.10.1.0/24 from area 51 into area 0, and can be seen as the last entry in this category.

Only the DR on an OSPF segment originates the Network LSA (LSA 2).



Rack1R5#show ip ospf database

            OSPF Router with ID (150.1.5.5) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
150.1.1.1       150.1.1.1       1857        0x80000005 0x007705 1
150.1.2.2       150.1.2.2       42          0x80000006 0x006115 1
150.1.3.3       150.1.3.3       15          0x80000006 0x004D24 1
150.1.5.5       150.1.5.5       1861        0x80000002 0x002D3E 1
223.255.255.255 223.255.255.255 80          0x80000004 0x008D60 1

                Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
155.1.0.5       150.1.5.5       1852        0x80000002 0x002A6B

                Summary Net Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
150.1.7.7       150.1.3.3       1373        0x80000001 0x00DD1A
155.1.5.0       150.1.5.5       93          0x80000002 0x00D225
155.1.7.0       150.1.3.3       1373        0x80000001 0x00E217
155.1.8.0       150.1.5.5       93          0x80000002 0x00BB38
155.1.9.0       150.1.3.3       1376        0x80000001 0x00D620
155.1.10.0      150.1.5.5       95          0x80000002 0x00AF41
155.1.37.0      150.1.3.3       260         0x80000003 0x008951
155.1.58.0      150.1.5.5       95          0x80000002 0x008939
155.1.67.0      150.1.3.3       1376        0x80000001 0x004C71
155.1.79.0      150.1.3.3       1376        0x80000001 0x00C7E9
155.1.108.0     150.1.5.5       95          0x80000002 0x006B24
155.1.146.0     150.1.1.1       74          0x80000003 0x00EF81
155.1.146.0     223.255.255.255 82          0x80000003 0x0071B9
192.10.1.0      150.1.2.2       291         0x80000003 0x00D4FD

                Summary ASB Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum
192.10.1.254    150.1.2.2       291         0x80000003 0x00D002

                Router Link States (Area 3)

Link ID         ADV Router      Age         Seq#       Checksum Link count
150.1.5.5       150.1.5.5       95          0x80000009 0x0084F4 2
150.1.8.8       150.1.8.8       1619        0x80000004 0x00C377 3
223.255.255.255 223.255.255.255 1638        0x80000003 0x00DEB6 2
         
                Net Link States (Area 3)

Link ID         ADV Router      Age         Seq#       Checksum
155.1.58.8      150.1.8.8       1619        0x80000003 0x00E681
155.1.108.8     150.1.8.8       1628        0x80000003 0x0051A6

                Summary Net Link States (Area 3)

Link ID         ADV Router      Age         Seq#       Checksum
150.1.7.7       150.1.5.5       1386        0x80000001 0x00466D
155.1.0.0       150.1.5.5       106         0x80000004 0x007E3D
155.1.7.0       150.1.5.5       1386        0x80000001 0x004B6A
155.1.9.0       150.1.5.5       1386        0x80000001 0x003F73
155.1.37.0      150.1.5.5       1860        0x80000001 0x00F5A2
155.1.67.0      150.1.5.5       1386        0x80000001 0x00B4C4
155.1.79.0      150.1.5.5       1386        0x80000001 0x00303D
155.1.146.0     150.1.5.5       1870        0x80000001 0x0042E8
192.10.1.0      150.1.5.5       1860        0x80000001 0x00345A

                Summary ASB Link States (Area 3)

Link ID         ADV Router      Age         Seq#       Checksum
192.10.1.254    150.1.5.5       1860        0x80000001 0x00305E

                Type-5 AS External Link States

Link ID         ADV Router      Age         Seq#       Checksum Tag
51.51.51.51     192.10.1.254    140         0x80000230 0x00389F 0

Rack1R5#