OSPF例
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開始行:
[[CISCO入門]]
#setlinebreak(on)
バージョン： &Version; &br;
オンラインユーザー数： &online;
閲覧数表示 本日/トータル： &counter(today); / &counter(to...
最終更新：&lastmod();&br;
*OSPF [#kce05806]
*OSPFﾊﾟｹｯﾄの種類 [#o08e59e5]
,1,Hello,ﾈｲﾊﾞｰ関係を確立及び維持する(Mｷｬｽﾄ224.0.0.5を定期...
,2,DBD(DataBase Description),ﾘﾝｸｽﾃｰﾄDBの同期ﾁｪｯｸを行う
,3,LSR(Link-State Request),ﾘﾝｸｽﾃｰﾄ情報(LSA)を要求
,4,LSU(Link-State Update),ﾘﾝｸｽﾃｰﾄ情報(LSA)を送信
,5,LSAck(LS Acknowledgment),Helloを除くﾊﾟｹｯﾄの応答確認
*OSPFの優先順位 [#l4dfdfaf]
OSPFﾌﾟﾛｾｽを起動したﾙｰﾀには名前代わりのﾙｰﾀIDという識別子が...
ﾙｰﾀIDは32ﾋﾞｯﾄの値でIPｱﾄﾞﾚｽと同じように4ｵｸﾃｯﾄに分割して10...
ﾙｰﾀIDは重複してはいけない。
一度決定したﾙｰﾀIDが変更されるとﾈｲﾊﾞｰ確立のからやり直す必...
LSDBを再構成しなければならない。
**１．ﾙｰﾀID [#p36d0d78]
明示的にﾙｰﾀIDが指定されている場合にはIDを参照する
R1(config-router)#router-id 1.1.1.250
R1#clear ip ospf process
Reset ALL OSPF processes? [no]: yes
**２．ﾙｰﾌﾟﾊﾞｯｸIFの最大IP [#o07dd874]
ﾙｰﾌﾟﾊﾞｯｸIFは論理的なIFで、基本的にDownする事が無く
不安定な障害によってIDが変更される事が無い/32指定も可能。
但し最低1つのIFがUPしている必要がある。
SW2(config)#interface loopback 0
SW2(config-if)#ip address 1.1.1.0 255.255.255.255
**３．ｱｸﾃｨﾌﾞなIFの中で最大のIPｱﾄﾞﾚｽ [#x3992c07]
ﾙｰﾌﾟﾊﾞｯｸIF以外のｱｸﾃｨﾌﾞなIF中最大のIPがﾙｰﾀIDとして選出され...
選択されるIFはOSPFが有効であるかは関係ない。
１．２．はDef存在しないので、このﾌﾟﾛｾｽでﾙｰﾀIDが決定される
*DR(Designated Router)/BDR(Backup DR) [#b31257ba]
OSPFではｲｰｻﾈｯﾄ環境下でDRとBDRを選出し、効率の良いLSDB同期...
,DR(Designated Router),LSA交換を取りまとめる代表ﾙｰﾀ
,BDR(Backup designated Router),DRのﾊﾞｯｸｱｯﾌﾟﾙｰﾀ
,DROTHER,DR/BDR以外のﾙｰﾀ
DR/BDR選出後は各ﾙｰﾀはDR/BDRとだけ隣接関係を確立し、
DROTHER同士は単なるﾈｲﾊﾞｰ関係にありLSAは交換しない
OSPFでは下記のﾏﾙﾁｷｬｽﾄを利用する
,224.0.0.5,全OSPFﾙｰﾀ宛
,224.0.0.6,DR/BDR宛
**DR/BDRの選出方法 [#r4530fe8]
OSPFﾌﾟﾗｲｵﾘﾃｨ値を基にして選出する
''Defは1''でOSPFが有効な各IFに設定可能
-ﾌﾟﾗｲｵﾘﾃｨ値が最大のﾙｰﾀがDR
-ﾌﾟﾗｲｵﾘﾃｨ値が2番目のﾙｰﾀがBDR
-ﾌﾟﾗｲｵﾘﾃｨ値が0はDROHTERに固定
-ﾌﾟﾗｲｵﾘﾃｨ値が同じ場合はﾙｰﾀIDが最大のﾙｰﾀがDR、次にﾙｰﾀIDが...
**OSPFによって最短ﾊﾟｽがﾙｰﾃｨﾝｸﾞﾃｰﾌﾞﾙに格納されるまで [#bf7...
,1,Down状態,ﾌﾟﾛｾｽ起動かﾘﾝｸｱｯﾌﾟ直後Helloﾊﾟｹｯﾄを受信してい...
,2,INIT状態,受信したHelloﾊﾟｹｯﾄに自身のIDが無く、双方向通...
,3,2WAY状態,Hello交換が終わってﾈｲﾊﾞｰﾃｰﾌﾞﾙに隣接ﾙｰﾀIDを追...
,4,DR/BDR選出,ﾏﾙﾁｱｸｾｽNWではDR/BDRの選出される。DROTHERは2...
,5,EXSTART状態,隣接関係を持つﾙｰﾀ間で送信開始基準の決定。...
,6,ECHANGE状態,ﾏｽﾀｰを決定した状態。DBDﾊﾟｹｯﾄが送信される。
,7,LOADING状態,各ﾙｰﾀは受信したDBDと自身のLSDBを比較して不...
,8,FULL状態,隣接ﾙｰﾀとLSDBが完全に同期を取ることが出来た状...
**ｺｽﾄ計算 [#lbacee23]
''ｺｽﾄ=IFの帯域幅(Mbps) / 100M(bps)''
※小数点以下は切り捨て、1未満は切り上げで1となるので100Mも...
,R1(config-router)#auto-cost reference-bandwidth 1000,ｺｽﾄ...
,R1(config-if)#ip ospf cost 10,IFのｺｽﾄを帯域幅に関係なく...
,R1(config-if)#ip ospf 100 area 0,IFでのArea0 ﾌﾟﾛｾｽ100の...
,R1(config-router)#passive-interface default,全ﾎﾟｰﾄでOSPF...
**OSPFの起動 [#nb76861f]
R1(config)#router ospf 100
R1(config-router)#network 10.1.1.0 0.0.0.255 area 0
R1(config-router)#network 10.2.2.0 0.0.0.255 area 1
R2(config)#router ospf 100
R2(config-router)#network 10.1.1.0 0.0.0.255 area 0
R2(config-router)#network 10.2.2.0 0.0.0.255 area 1
**ｺｽﾄ計算 [#e2ad2972]
'ｺｽﾄ=IFの帯域幅(Mbps) / 100M(bps)'
※小数点以下は切り捨て、1未満は切り上げで1となるので100Mも...
,R1(config-router)#auto-cost reference-bandwidth 1000,ｺｽﾄ...
,R1(config-if)#ip ospf cost 10,IFのｺｽﾄを帯域幅に関係なく...
,R1(config-if)#ip ospf 100 area 0,IFでのArea0 ﾌﾟﾛｾｽ100の...
,R1(config-router)#passive-interface default,全ﾎﾟｰﾄでOSPF...
**OSPFの起動 [#f5592e44]
R1(config)#router ospf 100
R1(config-router)#network 10.1.1.0 0.0.0.255 area 0
R1(config-router)#network 10.2.2.0 0.0.0.255 area 1
R2(config)#router ospf 100
R2(config-router)#network 10.1.1.0 0.0.0.255 area 0
R2(config-router)#network 10.2.2.0 0.0.0.255 area 1
**OSPFﾌﾟﾗｲｵﾘﾃｨ変更 [#r06f772f]
,R3(config-if)#ip ospf priority 0,IFのﾌﾟﾗｲｵﾘﾃｨを0に変更す...
-変更前、State DR, Priority 1に注目
R3#show ip ospf interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 10.3.3.1/24, Area 1
Process ID 100, Router ID 1.1.1.100, Network Type B...
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 1.1.1.100, Interface address...
Backup Designated router (ID) 1.1.1.140, Interface ...
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.140 (Backup Designa...
Suppress hello for 0 neighbor(s)
-変更後、State DROTHER, Priority 0になっている
R3#show ip ospf interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 10.3.3.1/24, Area 1
Process ID 100, Router ID 1.1.1.100, Network Type B...
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 1.1.1.140, Interface address...
No backup designated router on this network
Old designated Router (ID) 1.1.1.100, Interface add...
Flush timer for old DR LSA due in 00:02:12
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.140 (Designated Rou...
Suppress hello for 0 neighbor(s)
R3#
**SHOWコマンドによる確認 [#e6b4a3cd]
-ﾈｲﾊﾞｰ情報
SW2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Add...
1.1.1.100 0 FULL/DROTHER 00:00:35 10....
1.1.1.200 1 FULL/BDR 00:00:38 10....
1.1.1.250 1 FULL/DR 00:00:37 10....
ﾙｰﾀID ﾈｲﾊﾞﾌﾟﾗｲｵﾘﾃｨ 状態 Deadﾀｲﾏ(Down検知) ﾈ...
-ﾈｲﾊﾞｰ情報の詳細
SW2#show ip ospf neighbor detail
Neighbor 1.1.1.100, interface address 10.3.3.1
In the area 1 via interface Vlan300
Neighbor priority is 0, State is FULL, 6 state ch...
DR is 10.3.3.254 BDR is 0.0.0.0
Options is 0x12 in Hello (E-bit L-bit )
Options is 0x52 in DBD (E-bit L-bit O-bit)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:31
Neighbor is up for 00:15:53
Index 3/3, retransmission queue length 0, number ...
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum ...
Neighbor 1.1.1.200, interface address 10.2.2.254
In the area 1 via interface Vlan200
Neighbor priority is 1, State is FULL, 6 state ch...
DR is 10.2.2.253 BDR is 10.2.2.254
Options is 0x12 in Hello (E-bit L-bit )
Options is 0x52 in DBD (E-bit L-bit O-bit)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:33
Neighbor is up for 00:15:53
Index 2/2, retransmission queue length 0, number ...
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum ...
Neighbor 1.1.1.250, interface address 10.2.2.253
In the area 1 via interface Vlan200
Neighbor priority is 1, State is FULL, 6 state ch...
DR is 10.2.2.253 BDR is 10.2.2.254
Options is 0x12 in Hello (E-bit L-bit )
Options is 0x52 in DBD (E-bit L-bit O-bit)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:36
Neighbor is up for 00:19:10
Index 1/1, retransmission queue length 0, number ...
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum ...
SW2#
-ﾙｰﾃｨﾝｸﾞﾌﾟﾛｾｽのﾊﾟﾗﾒｰﾀ確認
R1#show ip protocols
Routing Protocol is "ospf 100" ←OSPFのﾌﾟﾛｾｽID
Outgoing update filter list for all interfaces is n...
Incoming update filter list for all interfaces is n...
Router ID 1.1.1.250 ←ﾙｰﾀID
It is an area border router ←ABR(ｴﾘｱ境界ﾙｰﾀ)で...
Number of areas in this router is 2. 2 normal 0 stu...
Maximum path: 4 ←ﾛｰﾄﾞﾊﾞﾗﾝｽ最大数(De...
Routing for Networks: ←networkｺﾏﾝﾄﾞで指定...
10.1.1.0 0.0.0.255 area 0
10.2.2.0 0.0.0.255 area 1
Routing on Interfaces Configured Explicitly (Area 0):
FastEthernet0/0
Routing on Interfaces Configured Explicitly (Area 1):
FastEthernet0/1
Reference bandwidth unit is 1000 mbps ←OSPFｺｽﾄ計算の...
Routing Information Sources: ←ﾘﾝｸｽﾃｰﾄ情報
Gateway Distance Last Update
10.3.3.1 110 01:18:59
1.1.1.100 110 00:09:12
1.1.1.140 110 00:06:02
1.1.1.150 110 00:27:08
1.1.1.200 110 00:20:35
10.2.2.254 110 01:18:01
Gateway Distance Last Update
10.10.10.254 110 01:19:00
Distance: (default is 110) ←ｱﾄﾞﾐﾆｽﾄﾚｰﾃｨﾌﾞ...
SW2#show ip ospf interface
Vlan300 is up, line protocol is up
Internet Address 10.3.3.254/24, Area 1
Process ID 100, Router ID 1.1.1.140, Network Type B...
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 1.1.1.140, Interface address...
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 3
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.100
Suppress hello for 0 neighbor(s)
Vlan200 is up, line protocol is up
Internet Address 10.2.2.1/24, Area 1
Process ID 100, Router ID 1.1.1.140, Network Type B...
Transmit Delay is 1 sec, State DROTHER, Priority 1
Designated Router (ID) 1.1.1.250, Interface address...
Backup Designated router (ID) 1.1.1.200, Interface ...
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 2
Last flood scan time is 0 msec, maximum is 9 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 1.1.1.200 (Backup Designa...
Adjacent with neighbor 1.1.1.250 (Designated Rou...
Suppress hello for 0 neighbor(s)
SW2#show ip ospf database
OSPF Router with ID (1.1.1.140) (Process ...
Router Link States (Area 1) ←LSA...
Link ID ADV Router Age Seq# ...
1.1.1.100 1.1.1.100 1332 0x8000000...
1.1.1.140 1.1.1.140 1329 0x8000000...
1.1.1.200 1.1.1.200 799 0x8000000...
1.1.1.250 1.1.1.250 697 0x8000000...
Net Link States (Area 1) ←LSA...
Link ID ADV Router Age Seq# ...
10.2.2.253 1.1.1.250 190 0x8000000...
10.3.3.254 1.1.1.140 1515 0x8000000...
Summary Net Link States (Area 1) ←LSA...
Link ID ADV Router Age Seq# ...
10.1.1.0 1.1.1.200 560 0x8000000...
10.1.1.0 1.1.1.250 697 0x8000000...
10.10.10.0 1.1.1.200 560 0x8000000...
10.10.10.0 1.1.1.250 697 0x8000000...
SW2#
*OSPFのﾀｲﾌﾟ [#e82c943f]
OSPFで識別されるNWの種類は３つ
-ポイントツーポイント
-ブロードキャストマルチアクセス
-NBMA
更にNBMAが5種に分けられるので以下のとおり。
,NWﾓｰﾄﾞ,変更ﾓｰﾄﾞ,NBMAﾓｰﾄﾞ,DR/BDE選出,ﾈｲﾊﾞ自動検出,Hello/D...
,ポイントツーポイント,-,-,行わない,○,10/40,ﾌﾚｰﾑﾘﾚｰのｻﾌﾞIF...
,ブロードキャストマルチアクセス,-,-,行う,○,10/40,Ethernet...
,NBMA,NBMA,RFC2328準拠ﾓｰﾄﾞ,行う,×,30/120,DRはｻﾌﾞﾈｯﾄ上のOS...
,NBMA,ﾎﾟｲﾝﾄﾂｰﾏﾙﾁﾎﾟｲﾝﾄ,RFC2328準拠ﾓｰﾄﾞ,行わない,○,30/120,...
,NBMA,ﾌﾞﾛｰﾄﾞｷｬｽﾄ,シスコ追加ﾓｰﾄﾞ,行う,○,30/120,Ethernetと...
,NBMA,ﾎﾟｲﾝﾄﾂｰﾏﾙﾁﾎﾟｲﾝﾄﾉﾝﾌﾞﾛｰﾄﾞｷｬｽﾄ,シスコ追加ﾓｰﾄﾞ,行わない...
,NBMA,ﾎﾟｲﾝﾄﾂｰﾎﾟｲﾝﾄ,シスコ追加ﾓｰﾄﾞ,行わない,○,10/40,2台1組...
-ﾈｲﾊﾞｰ手動登録ｺﾏﾝﾄﾞ
,SW2(config-router)#neighbor 1.1.1.1,ﾈｲﾊﾞｰ関係を手動登録...
***OSPFのIF種別動作 [#t920ea77]
,LAN,ﾌﾞﾛｰﾄﾞｷｬｽﾄﾏﾙﾁｱｸｾｽ
,HDLC/PPPのｼﾘｱﾙIF,ﾎﾟｲﾝﾄﾂｰﾎﾟｲﾝﾄ
,ﾌﾚｰﾑﾘﾚｰのﾒｼﾞｬｰIF,NBMA
,ﾌﾚｰﾑﾘﾚｰのｻﾌﾞIF,ﾎﾟｲﾝﾄﾂｰﾎﾟｲﾝﾄ
,ﾌﾚｰﾑﾘﾚｰのｻﾌﾞIF,NBMA
終了行:
[[CISCO入門]]
#setlinebreak(on)
バージョン： &Version; &br;
オンラインユーザー数： &online;
閲覧数表示 本日/トータル： &counter(today); / &counter(to...
最終更新：&lastmod();&br;
*OSPF [#kce05806]
*OSPFﾊﾟｹｯﾄの種類 [#o08e59e5]
,1,Hello,ﾈｲﾊﾞｰ関係を確立及び維持する(Mｷｬｽﾄ224.0.0.5を定期...
,2,DBD(DataBase Description),ﾘﾝｸｽﾃｰﾄDBの同期ﾁｪｯｸを行う
,3,LSR(Link-State Request),ﾘﾝｸｽﾃｰﾄ情報(LSA)を要求
,4,LSU(Link-State Update),ﾘﾝｸｽﾃｰﾄ情報(LSA)を送信
,5,LSAck(LS Acknowledgment),Helloを除くﾊﾟｹｯﾄの応答確認
*OSPFの優先順位 [#l4dfdfaf]
OSPFﾌﾟﾛｾｽを起動したﾙｰﾀには名前代わりのﾙｰﾀIDという識別子が...
ﾙｰﾀIDは32ﾋﾞｯﾄの値でIPｱﾄﾞﾚｽと同じように4ｵｸﾃｯﾄに分割して10...
ﾙｰﾀIDは重複してはいけない。
一度決定したﾙｰﾀIDが変更されるとﾈｲﾊﾞｰ確立のからやり直す必...
LSDBを再構成しなければならない。
**１．ﾙｰﾀID [#p36d0d78]
明示的にﾙｰﾀIDが指定されている場合にはIDを参照する
R1(config-router)#router-id 1.1.1.250
R1#clear ip ospf process
Reset ALL OSPF processes? [no]: yes
**２．ﾙｰﾌﾟﾊﾞｯｸIFの最大IP [#o07dd874]
ﾙｰﾌﾟﾊﾞｯｸIFは論理的なIFで、基本的にDownする事が無く
不安定な障害によってIDが変更される事が無い/32指定も可能。
但し最低1つのIFがUPしている必要がある。
SW2(config)#interface loopback 0
SW2(config-if)#ip address 1.1.1.0 255.255.255.255
**３．ｱｸﾃｨﾌﾞなIFの中で最大のIPｱﾄﾞﾚｽ [#x3992c07]
ﾙｰﾌﾟﾊﾞｯｸIF以外のｱｸﾃｨﾌﾞなIF中最大のIPがﾙｰﾀIDとして選出され...
選択されるIFはOSPFが有効であるかは関係ない。
１．２．はDef存在しないので、このﾌﾟﾛｾｽでﾙｰﾀIDが決定される
*DR(Designated Router)/BDR(Backup DR) [#b31257ba]
OSPFではｲｰｻﾈｯﾄ環境下でDRとBDRを選出し、効率の良いLSDB同期...
,DR(Designated Router),LSA交換を取りまとめる代表ﾙｰﾀ
,BDR(Backup designated Router),DRのﾊﾞｯｸｱｯﾌﾟﾙｰﾀ
,DROTHER,DR/BDR以外のﾙｰﾀ
DR/BDR選出後は各ﾙｰﾀはDR/BDRとだけ隣接関係を確立し、
DROTHER同士は単なるﾈｲﾊﾞｰ関係にありLSAは交換しない
OSPFでは下記のﾏﾙﾁｷｬｽﾄを利用する
,224.0.0.5,全OSPFﾙｰﾀ宛
,224.0.0.6,DR/BDR宛
**DR/BDRの選出方法 [#r4530fe8]
OSPFﾌﾟﾗｲｵﾘﾃｨ値を基にして選出する
''Defは1''でOSPFが有効な各IFに設定可能
-ﾌﾟﾗｲｵﾘﾃｨ値が最大のﾙｰﾀがDR
-ﾌﾟﾗｲｵﾘﾃｨ値が2番目のﾙｰﾀがBDR
-ﾌﾟﾗｲｵﾘﾃｨ値が0はDROHTERに固定
-ﾌﾟﾗｲｵﾘﾃｨ値が同じ場合はﾙｰﾀIDが最大のﾙｰﾀがDR、次にﾙｰﾀIDが...
**OSPFによって最短ﾊﾟｽがﾙｰﾃｨﾝｸﾞﾃｰﾌﾞﾙに格納されるまで [#bf7...
,1,Down状態,ﾌﾟﾛｾｽ起動かﾘﾝｸｱｯﾌﾟ直後Helloﾊﾟｹｯﾄを受信してい...
,2,INIT状態,受信したHelloﾊﾟｹｯﾄに自身のIDが無く、双方向通...
,3,2WAY状態,Hello交換が終わってﾈｲﾊﾞｰﾃｰﾌﾞﾙに隣接ﾙｰﾀIDを追...
,4,DR/BDR選出,ﾏﾙﾁｱｸｾｽNWではDR/BDRの選出される。DROTHERは2...
,5,EXSTART状態,隣接関係を持つﾙｰﾀ間で送信開始基準の決定。...
,6,ECHANGE状態,ﾏｽﾀｰを決定した状態。DBDﾊﾟｹｯﾄが送信される。
,7,LOADING状態,各ﾙｰﾀは受信したDBDと自身のLSDBを比較して不...
,8,FULL状態,隣接ﾙｰﾀとLSDBが完全に同期を取ることが出来た状...
**ｺｽﾄ計算 [#lbacee23]
''ｺｽﾄ=IFの帯域幅(Mbps) / 100M(bps)''
※小数点以下は切り捨て、1未満は切り上げで1となるので100Mも...
,R1(config-router)#auto-cost reference-bandwidth 1000,ｺｽﾄ...
,R1(config-if)#ip ospf cost 10,IFのｺｽﾄを帯域幅に関係なく...
,R1(config-if)#ip ospf 100 area 0,IFでのArea0 ﾌﾟﾛｾｽ100の...
,R1(config-router)#passive-interface default,全ﾎﾟｰﾄでOSPF...
**OSPFの起動 [#nb76861f]
R1(config)#router ospf 100
R1(config-router)#network 10.1.1.0 0.0.0.255 area 0
R1(config-router)#network 10.2.2.0 0.0.0.255 area 1
R2(config)#router ospf 100
R2(config-router)#network 10.1.1.0 0.0.0.255 area 0
R2(config-router)#network 10.2.2.0 0.0.0.255 area 1
**ｺｽﾄ計算 [#e2ad2972]
'ｺｽﾄ=IFの帯域幅(Mbps) / 100M(bps)'
※小数点以下は切り捨て、1未満は切り上げで1となるので100Mも...
,R1(config-router)#auto-cost reference-bandwidth 1000,ｺｽﾄ...
,R1(config-if)#ip ospf cost 10,IFのｺｽﾄを帯域幅に関係なく...
,R1(config-if)#ip ospf 100 area 0,IFでのArea0 ﾌﾟﾛｾｽ100の...
,R1(config-router)#passive-interface default,全ﾎﾟｰﾄでOSPF...
**OSPFの起動 [#f5592e44]
R1(config)#router ospf 100
R1(config-router)#network 10.1.1.0 0.0.0.255 area 0
R1(config-router)#network 10.2.2.0 0.0.0.255 area 1
R2(config)#router ospf 100
R2(config-router)#network 10.1.1.0 0.0.0.255 area 0
R2(config-router)#network 10.2.2.0 0.0.0.255 area 1
**OSPFﾌﾟﾗｲｵﾘﾃｨ変更 [#r06f772f]
,R3(config-if)#ip ospf priority 0,IFのﾌﾟﾗｲｵﾘﾃｨを0に変更す...
-変更前、State DR, Priority 1に注目
R3#show ip ospf interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 10.3.3.1/24, Area 1
Process ID 100, Router ID 1.1.1.100, Network Type B...
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 1.1.1.100, Interface address...
Backup Designated router (ID) 1.1.1.140, Interface ...
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.140 (Backup Designa...
Suppress hello for 0 neighbor(s)
-変更後、State DROTHER, Priority 0になっている
R3#show ip ospf interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 10.3.3.1/24, Area 1
Process ID 100, Router ID 1.1.1.100, Network Type B...
Transmit Delay is 1 sec, State DROTHER, Priority 0
Designated Router (ID) 1.1.1.140, Interface address...
No backup designated router on this network
Old designated Router (ID) 1.1.1.100, Interface add...
Flush timer for old DR LSA due in 00:02:12
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.140 (Designated Rou...
Suppress hello for 0 neighbor(s)
R3#
**SHOWコマンドによる確認 [#e6b4a3cd]
-ﾈｲﾊﾞｰ情報
SW2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Add...
1.1.1.100 0 FULL/DROTHER 00:00:35 10....
1.1.1.200 1 FULL/BDR 00:00:38 10....
1.1.1.250 1 FULL/DR 00:00:37 10....
ﾙｰﾀID ﾈｲﾊﾞﾌﾟﾗｲｵﾘﾃｨ 状態 Deadﾀｲﾏ(Down検知) ﾈ...
-ﾈｲﾊﾞｰ情報の詳細
SW2#show ip ospf neighbor detail
Neighbor 1.1.1.100, interface address 10.3.3.1
In the area 1 via interface Vlan300
Neighbor priority is 0, State is FULL, 6 state ch...
DR is 10.3.3.254 BDR is 0.0.0.0
Options is 0x12 in Hello (E-bit L-bit )
Options is 0x52 in DBD (E-bit L-bit O-bit)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:31
Neighbor is up for 00:15:53
Index 3/3, retransmission queue length 0, number ...
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum ...
Neighbor 1.1.1.200, interface address 10.2.2.254
In the area 1 via interface Vlan200
Neighbor priority is 1, State is FULL, 6 state ch...
DR is 10.2.2.253 BDR is 10.2.2.254
Options is 0x12 in Hello (E-bit L-bit )
Options is 0x52 in DBD (E-bit L-bit O-bit)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:33
Neighbor is up for 00:15:53
Index 2/2, retransmission queue length 0, number ...
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum ...
Neighbor 1.1.1.250, interface address 10.2.2.253
In the area 1 via interface Vlan200
Neighbor priority is 1, State is FULL, 6 state ch...
DR is 10.2.2.253 BDR is 10.2.2.254
Options is 0x12 in Hello (E-bit L-bit )
Options is 0x52 in DBD (E-bit L-bit O-bit)
LLS Options is 0x1 (LR)
Dead timer due in 00:00:36
Neighbor is up for 00:19:10
Index 1/1, retransmission queue length 0, number ...
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum ...
SW2#
-ﾙｰﾃｨﾝｸﾞﾌﾟﾛｾｽのﾊﾟﾗﾒｰﾀ確認
R1#show ip protocols
Routing Protocol is "ospf 100" ←OSPFのﾌﾟﾛｾｽID
Outgoing update filter list for all interfaces is n...
Incoming update filter list for all interfaces is n...
Router ID 1.1.1.250 ←ﾙｰﾀID
It is an area border router ←ABR(ｴﾘｱ境界ﾙｰﾀ)で...
Number of areas in this router is 2. 2 normal 0 stu...
Maximum path: 4 ←ﾛｰﾄﾞﾊﾞﾗﾝｽ最大数(De...
Routing for Networks: ←networkｺﾏﾝﾄﾞで指定...
10.1.1.0 0.0.0.255 area 0
10.2.2.0 0.0.0.255 area 1
Routing on Interfaces Configured Explicitly (Area 0):
FastEthernet0/0
Routing on Interfaces Configured Explicitly (Area 1):
FastEthernet0/1
Reference bandwidth unit is 1000 mbps ←OSPFｺｽﾄ計算の...
Routing Information Sources: ←ﾘﾝｸｽﾃｰﾄ情報
Gateway Distance Last Update
10.3.3.1 110 01:18:59
1.1.1.100 110 00:09:12
1.1.1.140 110 00:06:02
1.1.1.150 110 00:27:08
1.1.1.200 110 00:20:35
10.2.2.254 110 01:18:01
Gateway Distance Last Update
10.10.10.254 110 01:19:00
Distance: (default is 110) ←ｱﾄﾞﾐﾆｽﾄﾚｰﾃｨﾌﾞ...
SW2#show ip ospf interface
Vlan300 is up, line protocol is up
Internet Address 10.3.3.254/24, Area 1
Process ID 100, Router ID 1.1.1.140, Network Type B...
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 1.1.1.140, Interface address...
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 3
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 1.1.1.100
Suppress hello for 0 neighbor(s)
Vlan200 is up, line protocol is up
Internet Address 10.2.2.1/24, Area 1
Process ID 100, Router ID 1.1.1.140, Network Type B...
Transmit Delay is 1 sec, State DROTHER, Priority 1
Designated Router (ID) 1.1.1.250, Interface address...
Backup Designated router (ID) 1.1.1.200, Interface ...
Timer intervals configured, Hello 10, Dead 40, Wait...
oob-resync timeout 40
Hello due in 00:00:00
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 2
Last flood scan time is 0 msec, maximum is 9 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 1.1.1.200 (Backup Designa...
Adjacent with neighbor 1.1.1.250 (Designated Rou...
Suppress hello for 0 neighbor(s)
SW2#show ip ospf database
OSPF Router with ID (1.1.1.140) (Process ...
Router Link States (Area 1) ←LSA...
Link ID ADV Router Age Seq# ...
1.1.1.100 1.1.1.100 1332 0x8000000...
1.1.1.140 1.1.1.140 1329 0x8000000...
1.1.1.200 1.1.1.200 799 0x8000000...
1.1.1.250 1.1.1.250 697 0x8000000...
Net Link States (Area 1) ←LSA...
Link ID ADV Router Age Seq# ...
10.2.2.253 1.1.1.250 190 0x8000000...
10.3.3.254 1.1.1.140 1515 0x8000000...
Summary Net Link States (Area 1) ←LSA...
Link ID ADV Router Age Seq# ...
10.1.1.0 1.1.1.200 560 0x8000000...
10.1.1.0 1.1.1.250 697 0x8000000...
10.10.10.0 1.1.1.200 560 0x8000000...
10.10.10.0 1.1.1.250 697 0x8000000...
SW2#
*OSPFのﾀｲﾌﾟ [#e82c943f]
OSPFで識別されるNWの種類は３つ
-ポイントツーポイント
-ブロードキャストマルチアクセス
-NBMA
更にNBMAが5種に分けられるので以下のとおり。
,NWﾓｰﾄﾞ,変更ﾓｰﾄﾞ,NBMAﾓｰﾄﾞ,DR/BDE選出,ﾈｲﾊﾞ自動検出,Hello/D...
,ポイントツーポイント,-,-,行わない,○,10/40,ﾌﾚｰﾑﾘﾚｰのｻﾌﾞIF...
,ブロードキャストマルチアクセス,-,-,行う,○,10/40,Ethernet...
,NBMA,NBMA,RFC2328準拠ﾓｰﾄﾞ,行う,×,30/120,DRはｻﾌﾞﾈｯﾄ上のOS...
,NBMA,ﾎﾟｲﾝﾄﾂｰﾏﾙﾁﾎﾟｲﾝﾄ,RFC2328準拠ﾓｰﾄﾞ,行わない,○,30/120,...
,NBMA,ﾌﾞﾛｰﾄﾞｷｬｽﾄ,シスコ追加ﾓｰﾄﾞ,行う,○,30/120,Ethernetと...
,NBMA,ﾎﾟｲﾝﾄﾂｰﾏﾙﾁﾎﾟｲﾝﾄﾉﾝﾌﾞﾛｰﾄﾞｷｬｽﾄ,シスコ追加ﾓｰﾄﾞ,行わない...
,NBMA,ﾎﾟｲﾝﾄﾂｰﾎﾟｲﾝﾄ,シスコ追加ﾓｰﾄﾞ,行わない,○,10/40,2台1組...
-ﾈｲﾊﾞｰ手動登録ｺﾏﾝﾄﾞ
,SW2(config-router)#neighbor 1.1.1.1,ﾈｲﾊﾞｰ関係を手動登録...
***OSPFのIF種別動作 [#t920ea77]
,LAN,ﾌﾞﾛｰﾄﾞｷｬｽﾄﾏﾙﾁｱｸｾｽ
,HDLC/PPPのｼﾘｱﾙIF,ﾎﾟｲﾝﾄﾂｰﾎﾟｲﾝﾄ
,ﾌﾚｰﾑﾘﾚｰのﾒｼﾞｬｰIF,NBMA
,ﾌﾚｰﾑﾘﾚｰのｻﾌﾞIF,ﾎﾟｲﾝﾄﾂｰﾎﾟｲﾝﾄ
,ﾌﾚｰﾑﾘﾚｰのｻﾌﾞIF,NBMA
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