ospf-1
step1： 配置接口地址及ospf
略
step2： 观察邻居状态，路由表，ospf 状态，dr，
2.1 邻居状态
[r1-ospf-1]disp ospf pe br
OSPF Process 1 with Router ID 10.0.1.1
Peer Statistic Information
----------------------------------------------------------------------------
Area Id Interface Neighbor id State
0.0.0.0 GigabitEthernet0/0/0 10.0.2.2 Full
0.0.0.0 GigabitEthernet0/0/0 10.0.3.3 Full
----------------------------------------------------------------------------
2.2 路由表
<r1>disp ip rou
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 12 Routes : 12
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.0.1.0/24 Direct 0 0 D 10.0.1.1 LoopBack0
10.0.1.1/32 Direct 0 0 D 127.0.0.1 LoopBack0
10.0.1.255/32 Direct 0 0 D 127.0.0.1 LoopBack0
10.0.2.2/32 OSPF 10 1 D 10.0.123.2 GigabitEthernet0/0/0
10.0.3.3/32 OSPF 10 1 D 10.0.123.3 GigabitEthernet0/0/0
10.0.123.0/24 Direct 0 0 D 10.0.123.1 GigabitEthernet0/0/0
10.0.123.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0
10.0.123.255/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
2.3 ospf 状态
<r1>disp ospf br
OSPF Process 1 with Router ID 10.0.1.1
OSPF Protocol Information
RouterID: 10.0.1.1 Border Router:
Multi-VPN-Instance is not enabled
Global DS-TE Mode: Non-Standard IETF Mode
Graceful-restart capability: disabled
Helper support capability : not configured
Applications Supported: MPLS Traffic-Engineering
Spf-schedule-interval: max 10000ms, start 500ms, hold 1000ms (ps: 1s左右）
Default ASE parameters: Metric: 1 Tag: 1 Type: 2
Route Preference: 10
ASE Route Preference: 150
SPF Computation Count: 8
RFC 1583 Compatible
Retransmission limitation is disabled
Area Count: 1 Nssa Area Count: 0
ExChange/Loading Neighbors: 0
Process total up interface count: 2
Process valid up interface count: 1
Area: 0.0.0.0 (MPLS TE not enabled)
Authtype: None Area flag: Normal
SPF scheduled Count: 8
ExChange/Loading Neighbors: 0
Router ID conflict state: Normal
Area interface up count: 2
Interface: 10.0.123.1 (GigabitEthernet0/0/0)
Cost: 1 State: DR Type: Broadcast MTU: 1500
Priority: 1
Designated Router: 10.0.123.1 （PS:我的dr我R1)
Backup Designated Router: 10.0.123.2
Timers: Hello 10 , Dead 40 , Poll 120 , Retransmit 5 , Transmit Delay 1
Interface: 10.0.1.1 (LoopBack0)
Cost: 0 State: P-2-P Type: P2P MTU: 1500
Timers: Hello 10 , Dead 40 , Poll 120 , Retransmit 5 , Transmit Delay 1
rid选举：
1 尽管配置了环回口地址，在没有制定rid的情况下，我的结果是10.0.123.x 为dr
2 已指定为lo0
dr选举：
1 先启动的选举为dr ，dr非抢占
2 同时启动时，优先级高的，接口地址大的优
step3： 分析lsa
<r1>disp ospf lsdb self-originate
OSPF Process 1 with Router ID 10.0.1.1
Link State Database
Area: 0.0.0.0
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.0.1.1 10.0.1.1 118 48 80000009 1
Network 10.0.123.1 10.0.1.1 118 36 80000005 0
<r2>disp ospf lsdb self-originate
OSPF Process 1 with Router ID 10.0.2.2
Link State Database
Area: 0.0.0.0
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.0.2.2 10.0.2.2 158 48 80000007 0
------------------------可以看出，r1 作为dr产生一条 router lsa 和network lsa， r2 只产生router lsa
<r1>disp ospf lsdb
OSPF Process 1 with Router ID 10.0.1.1
Link State Database
Area: 0.0.0.0
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.0.3.3 10.0.3.3 1162 48 80000013 0
Router 10.0.2.2 10.0.2.2 1162 48 80000014 0
Router 10.0.1.1 10.0.1.1 1160 48 8000000F 1
Network 10.0.123.1 10.0.1.1 1162 36 80000007 0
---------------------在r1上，可以看出 r1 r2 r3 各产生一条router， r1 另产生1条network lsa
<r2>disp ospf lsdb router self-originate
OSPF Process 1 with Router ID 10.0.2.2
Area: 0.0.0.0
Link State Database
Type : Router
Ls id : 10.0.2.2
Adv rtr : 10.0.2.2
Ls age : 273
Len : 48
Options : E
seq# : 80000007
chksum : 0x9c68
Link count: 2
* Link ID: 10.0.2.2
Data : 255.255.255.255 （ps lo 32位）
Link Type: StubNet
Metric : 0
Priority : Medium
* Link ID: 10.0.123.1 （ps：dr地址）
Data : 10.0.123.2 （本接口地址）
Link Type: TransNet
Metric : 1 （ps 接口cost）
----------------------------以上是 r2 router lsa， 描述连接两个网络，一个lo stub ， 一个ma ，transnet
<r2>disp ospf lsdb network
OSPF Process 1 with Router ID 10.0.2.2
Area: 0.0.0.0
Link State Database
Type : Network
Ls id : 10.0.123.1
Adv rtr : 10.0.1.1
Ls age : 672
Len : 36
Options : E
seq# : 80000005
chksum : 0x3d58
Net mask : 255.255.255.0
Priority : Low
Attached Router 10.0.1.1
Attached Router 10.0.2.2
Attached Router 10.0.3.3
----------------------------------再看dr r1 产生的 network lsa ，描述本网段信息：lsa id =r1本网段的接口ip ，adv=r1 ， net mask=24， Attached Router= r1，r2，r3的rid
step4： 分析邻居建立
4.1 debug ospf 建立： 站在r1上，分析r2
<r1>
Oct 25 2020 22:00:29-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[36]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=2.123.0.10, NeighborEvent=HelloReceived, NeighborPreviousState=Down, NeighborCurrentState=Init) （ r2 收到r1的hello，init）
<r1>
Oct 25 2020 22:00:29-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[37]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=2.123.0.10, NeighborEvent=2WayReceived, NeighborPreviousState=Init, NeighborCurrentState=2Way) （r2 收到r1 hello中包含r2 ，2way）
<r1>
Oct 25 2020 22:00:29.629.3-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1136 Level: 0x20
OSPF 1: Nbr 10.0.123.2 Rcv HelloReceived State Down -> Init.
<r1>
Oct 25 2020 22:00:29.629.4-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1732 Level: 0x20
OSPF 1: Nbr 10.0.123.2 Rcv 2WayReceived State Init -> 2Way.
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[38]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=3.123.0.10, NeighborEvent=HelloReceived, NeighborPreviousState=Down, NeighborCurrentState=Init)
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[39]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=3.123.0.10, NeighborEvent=2WayReceived, NeighborPreviousState=Init, NeighborCurrentState=2Way)
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[40]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=2.123.0.10, NeighborEvent=AdjOk?, NeighborPreviousState=2Way, NeighborCurrentState=ExStart)
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[41]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=3.123.0.10, NeighborEvent=AdjOk?, NeighborPreviousState=2Way, NeighborCurrentState=ExStart)
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[42]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=2.123.0.10, NeighborEvent=NegotiationDone, NeighborPreviousState=ExStart, NeighborCurrentState=Exchange) （r2 表示协商完成，开始交换lsa）
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[43]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=3.123.0.10, NeighborEvent=NegotiationDone, NeighborPreviousState=ExStart, NeighborCurrentState=Exchange)
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[44]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=3.123.0.10, NeighborEvent=ExchangeDone, NeighborPreviousState=Exchange, NeighborCurrentState=Loading) （r2 表示同步完成，开始交换加载）
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[45]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=2.123.0.10, NeighborEvent=ExchangeDone, NeighborPreviousState=Exchange, NeighborCurrentState=Loading)
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[46]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=2.123.0.10, NeighborEvent=LoadingDone, NeighborPreviousState=Loading, NeighborCurrentState=Full) （r2 加载完成， full）
<r1>
Oct 25 2020 22:00:30-08:00 r1 %%01OSPF/4/NBR_CHANGE_E(l)[47]:Neighbor changes event: neighbor status changed. (ProcessId=256, NeighborAddress=3.123.0.10, NeighborEvent=LoadingDone, NeighborPreviousState=Loading, NeighborCurrentState=Full)
<r1>
Oct 25 2020 22:00:30.19.1-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1136 Level: 0x20
OSPF 1: Nbr 10.0.123.3 Rcv HelloReceived State Down -> Init.
<r1>
Oct 25 2020 22:00:30.19.2-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1732 Level: 0x20
OSPF 1: Nbr 10.0.123.3 Rcv 2WayReceived State Init -> 2Way.
<r1>
Oct 25 2020 22:00:30.19.3-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1732 Level: 0x20
OSPF 1: Nbr 10.0.123.2 Rcv AdjOk? State 2Way -> ExStart.
<r1>
Oct 25 2020 22:00:30.19.4-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1732 Level: 0x20
OSPF 1: Nbr 10.0.123.3 Rcv AdjOk? State 2Way -> ExStart.
<r1>
Oct 25 2020 22:00:30.19.5-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802c Line: 2107 Level: 0x20
OSPF 1: Intf 10.0.123.1 Rcv BackupSeen State Waiting -> DROther.
<r1>
Oct 25 2020 22:00:30.59.1-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1845 Level: 0x20
OSPF 1: Nbr 10.0.123.2 Rcv NegotiationDone State ExStart -> Exchange.
<r1>
Oct 25 2020 22:00:30.69.1-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1845 Level: 0x20
OSPF 1: Nbr 10.0.123.3 Rcv NegotiationDone State ExStart -> Exchange.
<r1>
Oct 25 2020 22:00:30.119.1-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1957 Level: 0x20
OSPF 1: Nbr 10.0.123.3 Rcv ExchangeDone State Exchange -> Loading.
<r1>
Oct 25 2020 22:00:30.119.2-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 1957 Level: 0x20
OSPF 1: Nbr 10.0.123.2 Rcv ExchangeDone State Exchange -> Loading.
<r1>
Oct 25 2020 22:00:30.159.1-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 2356 Level: 0x20
OSPF 1: Nbr 10.0.123.2 Rcv LoadingDone State Loading -> Full.
<r1>
Oct 25 2020 22:00:30.159.2-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd017802d Line: 2356 Level: 0x20
OSPF 1: Nbr 10.0.123.3 Rcv LoadingDone State Loading -> Full.
<r1>
4.2 debug hello packet
<r1>debugging
Oct 25 2020 22:10:06.749.1-08:00 r1 RM/6/RMDEBUG:
FileID: 0xd0178024 Line: 2236 Level: 0x20
OSPF 1: RECV Packet. Interface: GigabitEthernet0/0/0
<r1>debugging
Oct 25 2020 22:10:06.749.2-08:00 r1 RM/6/RMDEBUG: Source Address: 10.0.123.2 r2 发出hello
<r1>debugging
Oct 25 2020 22:10:06.749.3-08:00 r1 RM/6/RMDEBUG: Destination Address: 224.0.0.5
<r1>debugging
Oct 25 2020 22:10:06.749.4-08:00 r1 RM/6/RMDEBUG: Ver# 2, Type: 1 (Hello)
<r1>debugging
Oct 25 2020 22:10:06.749.5-08:00 r1 RM/6/RMDEBUG: Length: 52, Router: 10.0.2.2
<r1>debugging
Oct 25 2020 22:10:06.749.6-08:00 r1 RM/6/RMDEBUG: Area: 0.0.0.0, Chksum: ce8a
<r1>debugging
Oct 25 2020 22:10:06.749.7-08:00 r1 RM/6/RMDEBUG: AuType: 00
<r1>debugging
Oct 25 2020 22:10:06.749.8-08:00 r1 RM/6/RMDEBUG: Key(ascii): * * * * * * * *
<r1>debugging
Oct 25 2020 22:10:06.749.9-08:00 r1 RM/6/RMDEBUG: Net Mask: 255.255.255.0
<r1>debugging
Oct 25 2020 22:10:06.749.10-08:00 r1 RM/6/RMDEBUG: Hello Int: 10, Option: _E_
<r1>debugging
Oct 25 2020 22:10:06.749.11-08:00 r1 RM/6/RMDEBUG: Rtr Priority: 1, Dead Int: 40
<r1>debugging
Oct 25 2020 22:10:06.749.12-08:00 r1 RM/6/RMDEBUG: DR: 10.0.123.2
<r1>debugging
Oct 25 2020 22:10:06.749.13-08:00 r1 RM/6/RMDEBUG: BDR: 10.0.123.3
<r1>debugging
Oct 25 2020 22:10:06.749.14-08:00 r1 RM/6/RMDEBUG: # Attached Neighbors: 2
<r1>debugging
Oct 25 2020 22:10:06.749.15-08:00 r1 RM/6/RMDEBUG: Neighbor: 10.0.1.1
<r1>debugging
Oct 25 2020 22:10:06.749.16-08:00 r1 RM/6/RMDEBUG: Neighbor: 10.0.3.3
<r1>debugging -------------------------------------------------------------------------------
<r1>debugging
Oct 25 2020 22:10:07.59.2-08:00 r1 RM/6/RMDEBUG: Source Address: 10.0.123.1
<r1>debugging
Oct 25 2020 22:10:07.59.3-08:00 r1 RM/6/RMDEBUG: Destination Address: 224.0.0.5
<r1>debugging
Oct 25 2020 22:10:07.59.4-08:00 r1 RM/6/RMDEBUG: Ver# 2, Type: 1 (Hello)
<r1>debugging
Oct 25 2020 22:10:07.59.5-08:00 r1 RM/6/RMDEBUG: Length: 52, Router: 10.0.1.1
<r1>debugging
Oct 25 2020 22:10:07.59.6-08:00 r1 RM/6/RMDEBUG: Area: 0.0.0.0, Chksum: ce8a
<r1>debugging
Oct 25 2020 22:10:07.59.7-08:00 r1 RM/6/RMDEBUG: AuType: 00
<r1>debugging
Oct 25 2020 22:10:07.59.8-08:00 r1 RM/6/RMDEBUG: Key(ascii): * * * * * * * *
<r1>debugging
Oct 25 2020 22:10:07.59.9-08:00 r1 RM/6/RMDEBUG: Net Mask: 255.255.255.0
<r1>debugging
Oct 25 2020 22:10:07.59.10-08:00 r1 RM/6/RMDEBUG: Hello Int: 10, Option: _E_
<r1>debugging
Oct 25 2020 22:10:07.59.11-08:00 r1 RM/6/RMDEBUG: Rtr Priority: 1, Dead Int: 40
<r1>debugging
Oct 25 2020 22:10:07.59.12-08:00 r1 RM/6/RMDEBUG: DR: 10.0.123.2
<r1>debugging
Oct 25 2020 22:10:07.59.13-08:00 r1 RM/6/RMDEBUG: BDR: 10.0.123.3
<r1>debugging
Oct 25 2020 22:10:07.59.14-08:00 r1 RM/6/RMDEBUG: # Attached Neighbors: 2
<r1>debugging
Oct 25 2020 22:10:07.59.15-08:00 r1 RM/6/RMDEBUG: Neighbor: 10.0.2.2
<r1>debugging
Oct 25 2020 22:10:07.59.16-08:00 r1 RM/6/RMDEBUG: Neighbor: 10.0.3.3
<r1>debugging -----------------------------------------------------------------------------------------
Oct 25 2020 22:10:07.169.2-08:00 r1 RM/6/RMDEBUG: Source Address: 10.0.123.3
<r1>debugging
Oct 25 2020 22:10:07.169.3-08:00 r1 RM/6/RMDEBUG: Destination Address: 224.0.0.5
<r1>debugging
Oct 25 2020 22:10:07.169.4-08:00 r1 RM/6/RMDEBUG: Ver# 2, Type: 1 (Hello)
<r1>debugging
Oct 25 2020 22:10:07.169.5-08:00 r1 RM/6/RMDEBUG: Length: 52, Router: 10.0.3.3
<r1>debugging
Oct 25 2020 22:10:07.169.6-08:00 r1 RM/6/RMDEBUG: Area: 0.0.0.0, Chksum: ce8a
<r1>debugging
Oct 25 2020 22:10:07.169.7-08:00 r1 RM/6/RMDEBUG: AuType: 00
<r1>debugging
Oct 25 2020 22:10:07.169.8-08:00 r1 RM/6/RMDEBUG: Key(ascii): * * * * * * * *
<r1>debugging
Oct 25 2020 22:10:07.169.9-08:00 r1 RM/6/RMDEBUG: Net Mask: 255.255.255.0
<r1>debugging
Oct 25 2020 22:10:07.169.10-08:00 r1 RM/6/RMDEBUG: Hello Int: 10, Option: _E_
<r1>debugging
Oct 25 2020 22:10:07.169.11-08:00 r1 RM/6/RMDEBUG: Rtr Priority: 1, Dead Int: 40
<r1>debugging
Oct 25 2020 22:10:07.169.12-08:00 r1 RM/6/RMDEBUG: DR: 10.0.123.2
<r1>debugging
Oct 25 2020 22:10:07.169.13-08:00 r1 RM/6/RMDEBUG: BDR: 10.0.123.3
<r1>debugging
Oct 25 2020 22:10:07.169.14-08:00 r1 RM/6/RMDEBUG: # Attached Neighbors: 2
<r1>debugging
Oct 25 2020 22:10:07.169.15-08:00 r1 RM/6/RMDEBUG: Neighbor: 10.0.1.1
<r1>debugging
Oct 25 2020 22:10:07.169.16-08:00 r1 RM/6/RMDEBUG: Neighbor: 10.0.2.2
FileID: 0xd0178024 Line: 2236 Level: 0x20
OSPF 1: RECV Packet. Interface: GigabitEthernet0/0/0
step5：华为对lo 口发布32为路由，尽管地址为24位
<r1>disp ip rou p o
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Public routing table : OSPF
Destinations : 2 Routes : 2
OSPF routing table status : <Active>
Destinations : 2 Routes : 2
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.0.2.2/32 OSPF 10 1 D 10.0.123.2 GigabitEthernet0/0/0
10.0.3.3/32 OSPF 10 1 D 10.0.123.3 GigabitEthernet0/0/0
OSPF routing table status : <Inactive>
Destinations : 0 Routes : 0
<r1>disp ospf rou
<r1>disp ospf routing
OSPF Process 1 with Router ID 10.0.1.1
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
10.0.1.1/32 0 Stub 10.0.1.1 10.0.1.1 0.0.0.0
10.0.123.0/24 1 Transit 10.0.123.1 10.0.1.1 0.0.0.0
10.0.2.2/32 1 Stub 10.0.123.2 10.0.2.2 0.0.0.0
10.0.3.3/32 1 Stub 10.0.123.3 10.0.3.3 0.0.0.0
修改r1 lo0 网络类型为br 后，
<r2>disp ospf rou
OSPF Process 1 with Router ID 10.0.2.2
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
10.0.2.2/32 0 Stub 10.0.2.2 10.0.2.2 0.0.0.0
10.0.123.0/24 1 Transit 10.0.123.2 10.0.2.2 0.0.0.0
10.0.1.0/24 1 Stub 10.0.123.1 10.0.1.1 0.0.0.0
10.0.3.3/32 1 Stub 10.0.123.3 10.0.3.3 0.0.0.0
------------------------可以看出r1 的lo 0 网络掩码变为24
step6： 修改接口cost影响选路
<r2>disp ip rou 10.0.1.0
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Table : Public
Summary Count : 1
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.0.1.0/24 OSPF 10 1 D 10.0.123.1 GigabitEthernet0/0/0
---------------------------首先，在r2 上看r1 lo 0 口cost 为1 ，因为本路由进入r2的接口cost 为1， flags D - download to fib
修改r2 接口cost 为11，后
[r2-GigabitEthernet0/0/0]disp ip rou 10.0.1.0
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Table : Public
Summary Count : 1
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.0.1.0/24 OSPF 10 11 D 10.0.123.1 GigabitEthernet0/0/0
<r1>disp ospf lsdb router 10.0.2.2
OSPF Process 1 with Router ID 10.0.1.1
Area: 0.0.0.0
Link State Database
Type : Router
Ls id : 10.0.2.2
Adv rtr : 10.0.2.2
Ls age : 355
Len : 48
Options : E
seq# : 80000015
chksum : 0xc328
Link count: 2
* Link ID: 10.0.2.2
Data : 255.255.255.255
Link Type: StubNet
Metric : 0
Priority : Medium
* Link ID: 10.0.123.2
Data : 10.0.123.2
Link Type: TransNet
Metric : 11
----------------r1上可以看出，r2 的router lsa 已经显示cost 增大了 ，这只会影响r2 的出方向选路，r1 的选路并没有变化
<r1>disp ip rou p o
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Public routing table : OSPF
Destinations : 2 Routes : 2
OSPF routing table status : <Active>
Destinations : 2 Routes : 2
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.0.2.2/32 OSPF 10 1 D 10.0.123.2 GigabitEthernet0/0/0
10.0.3.3/32 OSPF 10 1 D 10.0.123.3 GigabitEthernet0/0/0
-------------------------结论，ospf 修改cost 影响本路由器出方向的流量，即路由的cost 是入接口cost 之和
step7：silent 接口
disp ospf int
OSPF Process 1 with Router ID 10.0.1.1
Interfaces
Area: 0.0.0.0 (MPLS TE not enabled)
IP Address Type State Cost Pri DR BDR
10.0.123.1 Broadcast DR 1 1 10.0.123.1 0.0.0.0
10.0.1.1 Broadcast DR 0 1 10.0.1.1 0.0.0.0
----------ospf 接口显示正常，但不会发出和处理ospf 报文
下一篇 ospf 多区域
