目次
概要
コア/ディストリビューション/アクセス層の3階層モデルのLANにおいて、OSPFでのルーティングを行う設定例です。
拠点1はコア/ディストリビューション/アクセス層の3階層モデルのLANです。拠点2は小規模なLANで、コア層を省略した2階層モデルです。ディストリビューション層やコア層は冗長化します。冗長化したディストリビューション層のレイヤ3スイッチでVRRPを利用します。また、拠点1と拠点2を接続する広域イーサネット網も冗長化します。
ネットワーク構成
物理構成
IPアドレス
| 機器 | インタフェース | IPアドレス/サブネットマスク |
|---|---|---|
| DSW111 | Vlan11 | 10.1.11.1/24 |
| Vlan101 | 10.1.101.1/24 | |
| Vlan102 | 10.1.102.1/24 | |
| Lo0 | 10.1.0.1/32 | |
| DSW112 | Vlan11 | 10.1.11.2/24 |
| Vlan103 | 10.1.103.2/24 | |
| Vlan104 | 10.1.104.2/24 | |
| Lo0 | 10.1.0.2/32 | |
| PC1 | F0/0 | 10.1.11.100/24 |
| DSW121 | Vlan21 | 10.1.21.1/24 |
| Vlan105 | 10.1.105.1/24 | |
| Vlan106 | 10.1.106.1/24 | |
| Lo0 | 10.1.0.3/32 | |
| DSW122 | Vlan21 | 10.1.21.2/24 |
| Vlan107 | 10.1.107.2/24 | |
| Vlan108 | 10.1.108.2/24 | |
| Lo0 | 10.1.0.4/32 | |
| PC1 | F0/0 | 10.1.21.100/24 |
| DSW131 | Vlan31 | 10.1.31.1/24 |
| Vlan109 | 10.1.109.1/24 | |
| Vlan110 | 10.1.110.1/24 | |
| Lo0 | 10.1.0.5/32 | |
| DSW132 | Vlan31 | 10.1.31.2/24 |
| Vlan111 | 10.1.111.2/24 | |
| Vlan112 | 10.1.112.2/24 | |
| Lo0 | 10.1.0.6/32 | |
| SRV | F0/0 | 10.1.11.100/24 |
| BBSW1 | Vlan101 | 10.1.101.11/24 |
| Vlan103 | 10.1.103.11/24 | |
| Vlan105 | 10.1.105.11/24 | |
| Vlan107 | 10.1.107.11/24 | |
| Vlan109 | 10.1.109.11/24 | |
| Vlan111 | 10.1.111.11/24 | |
| Vlan113 | 10.1.113.11/24 | |
| Vlan115 | 10.1.115.11/24 | |
| Lo0 | 10.1.0.7/32 | |
| BBSW2 | Vlan102 | 10.1.102.12/24 |
| Vlan104 | 10.1.104.12/24 | |
| Vlan106 | 10.1.106.12/24 | |
| Vlan108 | 10.1.108.12/24 | |
| Vlan110 | 10.1.110.12/24 | |
| Vlan112 | 10.1.112.12/24 | |
| Vlan114 | 10.1.114.12/24 | |
| Vlan116 | 10.1.116.12/24 | |
| Lo0 | 10.1.0.8/32 | |
| EDSW1 | Vlan113 | 10.1.113.1/24 |
| Vlan114 | 10.1.114.1/24 | |
| Vlan117 | 10.1.117.1/24 | |
| Vlan118 | 10.1.118.1/24 | |
| Lo0 | 10.1.0.9/32 | |
| EDSW2 | Vlan115 | 10.1.115.2/24 |
| Vlan116 | 10.1.116.2/24 | |
| Vlan119 | 10.1.119.2/24 | |
| Vlan120 | 10.1.120.2/24 | |
| Lo0 | 10.1.0.10/32 | |
| WSW11 | Vlan100 | 10.0.1.11/24 |
| Vlan200 | 10.0.2.11/24 | |
| Vlan117 | 10.1.117.11/24 | |
| Vlan119 | 10.1.119.11/24 | |
| Lo0 | 10.1.0.11/32 | |
| WSW12 | Vlan100 | 10.0.1.12/24 |
| Vlan200 | 10.0.2.12/24 | |
| Vlan118 | 10.1.118.12/24 | |
| Vlan120 | 10.1.120.12/24 | |
| Lo0 | 10.1.0.12/32 | |
| WSW21 | Vlan100 | 10.0.1.21/24 |
| Vlan200 | 10.0.2.21/24 | |
| Vlan11 | 10.2.11.21/24 | |
| Lo0 | 10.2.0.13/32 | |
| WSW22 | Vlan100 | 10.0.1.22/24 |
| Vlan200 | 10.0.2.22/24 | |
| Vlan11 | 10.2.11.22/24 | |
| Lo0 | 10.2.0.14/32 | |
| PC3 | F0/0 | 10.2.11.100/24 |
VRRP
| インタフェース | グループ番号 | 仮想IP | マスタルータ | トラック |
|---|---|---|---|---|
| Vlan11 | 11 | 10.1.11.254 | DSW111 | DSW111 F0/2、F0/3 |
| Vlan21 | 21 | 10.1.21.254 | DSW121 | DSW121 F0/2、F0/3 |
| Vlan31 | 31 | 10.1.31.254 | DSW131 | DSW131 F0/2、F0/3 |
| Vlan11(拠点2) | 11 | 10.2.11.254 | WSW21 | WSW21 F0/3、F0/3 |
論理構成
3階層モデルLANのOSPFルーティングの構成例
エリア構成の概要
- バックボーンエリア:広域イーサネット1、広域イーサネット2
- エリア1:拠点1
- エリア2:拠点2
各機器の設定ファイル
VLAN/SVIの設定を行ったうえで、基本的なOSPFの設定まで完了している状態の各機器の設定ファイルの内容を以下に挙げています。
拠点1
ASW111 設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ASW111 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/3 switchport access vlan 11 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
ASW121 設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ASW121 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,21,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport trunk allowed vlan 1,21,1002-1005 switchport mode trunk ! interface FastEthernet0/3 switchport access vlan 21 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
ASW131 設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ASW131 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,31,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport trunk allowed vlan 1,31,1002-1005 switchport mode trunk ! interface FastEthernet0/3 switchport access vlan 31 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
DSW111設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname DSW111 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! track 1 interface FastEthernet0/2 line-protocol ! track 2 interface FastEthernet0/3 line-protocol ! ! ! interface Loopback0 ip address 10.1.0.1 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 101 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 102 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan11 ip address 10.1.11.1 255.255.255.0 vrrp 11 ip 10.1.11.254 vrrp 11 priority 150 vrrp 11 track 1 decrement 30 vrrp 11 track 2 decrement 30 ! interface Vlan101 ip address 10.1.101.1 255.255.255.0 ! interface Vlan102 ip address 10.1.102.1 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan11 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
DSW112設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname DSW112 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.2 255.255.255.0 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 103 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 104 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan11 ip address 10.1.11.2 255.255.255.0 vrrp 11 ip 10.1.11.254 ! interface Vlan103 ip address 10.1.103.2 255.255.255.0 ! interface Vlan104 ip address 10.1.104.2 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan11 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
DSW121設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname DSW121 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! track 1 interface FastEthernet0/2 line-protocol ! track 2 interface FastEthernet0/3 line-protocol ! ! ! interface Loopback0 ip address 10.1.0.3 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,21,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 105 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 106 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan21 ip address 10.1.21.1 255.255.255.0 vrrp 21 ip 10.1.21.254 vrrp 21 priority 150 vrrp 21 track 1 decrement 30 vrrp 21 track 2 decrement 30 ! interface Vlan105 ip address 10.1.105.1 255.255.255.0 ! interface Vlan106 ip address 10.1.106.1 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan21 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
DSW122設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname DSW122 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.4 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,21,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 107 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 108 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan21 ip address 10.1.21.2 255.255.255.0 vrrp 21 ip 10.1.21.254 ! interface Vlan107 ip address 10.1.107.2 255.255.255.0 ! interface Vlan108 ip address 10.1.108.2 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan21 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
DSW131設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname DSW131 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! track 1 interface FastEthernet0/2 line-protocol ! track 2 interface FastEthernet0/3 line-protocol ! ! ! interface Loopback0 ip address 10.1.0.5 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,31,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 109 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 110 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan31 ip address 10.1.31.1 255.255.255.0 vrrp 31 ip 10.1.31.254 vrrp 31 priority 150 vrrp 31 track 1 decrement 30 vrrp 31 track 2 decrement 30 ! interface Vlan109 ip address 10.1.109.1 255.255.255.0 ! interface Vlan110 ip address 10.1.110.1 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan31 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
DSW132設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname DSW132 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.6 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,31,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport access vlan 111 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 112 spanning-tree portfast ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan31 ip address 10.1.31.2 255.255.255.0 vrrp 31 ip 10.1.31.254 ! interface Vlan111 ip address 10.1.111.2 255.255.255.0 ! interface Vlan112 ip address 10.1.112.2 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan31 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
EDSW1設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname EDSW1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.9 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport access vlan 113 spanning-tree portfast ! interface FastEthernet0/2 switchport access vlan 114 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 117 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 118 spanning-tree portfast ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan113 ip address 10.1.113.1 255.255.255.0 ! interface Vlan114 ip address 10.1.114.1 255.255.255.0 ! interface Vlan117 ip address 10.1.117.1 255.255.255.0 ! interface Vlan118 ip address 10.1.118.1 255.255.255.0 ! ! router ospf 1 log-adjacency-changes network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
EDSW2設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname EDSW2 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.10 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport access vlan 115 spanning-tree portfast ! interface FastEthernet0/2 switchport access vlan 116 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 119 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 120 spanning-tree portfast ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan115 ip address 10.1.115.2 255.255.255.0 ! interface Vlan116 ip address 10.1.116.2 255.255.255.0 ! interface Vlan119 ip address 10.1.119.2 255.255.255.0 ! interface Vlan120 ip address 10.1.120.2 255.255.255.0 ! ! router ospf 1 log-adjacency-changes network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
WSW11設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname WSW11 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.11 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport access vlan 117 spanning-tree portfast ! interface FastEthernet0/2 switchport access vlan 119 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 100 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 200 spanning-tree portfast ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan100 ip address 10.0.1.11 255.255.255.0 ! interface Vlan117 ip address 10.1.117.11 255.255.255.0 ! interface Vlan119 ip address 10.1.119.11 255.255.255.0 ! interface Vlan200 ip address 10.0.2.11 255.255.255.0 ! ! router ospf 1 log-adjacency-changes network 10.0.0.0 0.0.255.255 area 0 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
WSW12設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname WSW12 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.1.0.12 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport access vlan 118 spanning-tree portfast ! interface FastEthernet0/2 switchport access vlan 120 spanning-tree portfast ! interface FastEthernet0/3 switchport access vlan 100 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 200 spanning-tree portfast ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan100 ip address 10.0.1.12 255.255.255.0 ! interface Vlan118 ip address 10.1.118.12 255.255.255.0 ! interface Vlan120 ip address 10.1.120.12 255.255.255.0 ! interface Vlan200 ip address 10.0.2.12 255.255.255.0 ! ! router ospf 1 log-adjacency-changes network 10.0.0.0 0.0.255.255 area 0 network 10.1.0.0 0.0.255.255 area 1 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
PC1設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname PC1 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip routing ! ! no ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ip address 10.1.11.100 255.255.255.0 no ip route-cache duplex auto speed auto ! ! ip default-gateway 10.1.11.254 ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
PC2設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname PC2 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip routing ! ! no ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ip address 10.1.21.100 255.255.255.0 no ip route-cache duplex auto speed auto ! ! ip default-gateway 10.1.12.254 ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
SRV設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname SRV ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip routing ! ! no ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ip address 10.1.31.100 255.255.255.0 no ip route-cache duplex auto speed auto ! ! ip default-gateway 10.1.31.254 ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
拠点2
ASW211設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname ASW211 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/2 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/3 switchport access vlan 11 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
WSW21設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname WSW21 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! track 1 interface FastEthernet0/3 line-protocol ! track 2 interface FastEthernet0/3 line-protocol ! ! ! interface Loopback0 ip address 10.2.0.21 255.255.255.255 shutdown ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/2 ! interface FastEthernet0/3 switchport access vlan 100 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 200 spanning-tree portfast ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan11 ip address 10.2.11.21 255.255.255.0 vrrp 11 ip 10.2.11.254 vrrp 11 priority 150 vrrp 11 track 1 decrement 30 vrrp 11 track 2 decrement 30 ! interface Vlan100 ip address 10.0.1.21 255.255.255.0 ! interface Vlan200 ip address 10.0.2.21 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan11 network 10.0.0.0 0.0.255.255 area 0 network 10.2.0.0 0.0.255.255 area 2 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
WSW22設定ファイル(OSPF基本)
! version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname WSW22 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 ! ! ip cef ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface Loopback0 ip address 10.2.0.22 255.255.255.255 ! interface FastEthernet0/0 ! interface FastEthernet0/1 switchport trunk allowed vlan 1,11,1002-1005 switchport mode trunk ! interface FastEthernet0/2 ! interface FastEthernet0/3 switchport access vlan 100 spanning-tree portfast ! interface FastEthernet0/4 switchport access vlan 200 spanning-tree portfast ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface Vlan1 no ip address ! interface Vlan11 ip address 10.2.11.22 255.255.255.0 vrrp 11 ip 10.2.11.254 ! interface Vlan100 ip address 10.0.1.22 255.255.255.0 ! interface Vlan200 ip address 10.0.2.22 255.255.255.0 ! ! router ospf 1 log-adjacency-changes passive-interface Vlan11 network 10.0.0.0 0.0.255.255 area 0 network 10.2.0.0 0.0.255.255 area 2 ! ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
PC3設定ファイル(OSPF基本)
version 12.4 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname PC3 ! boot-start-marker boot-end-marker ! ! no aaa new-model memory-size iomem 5 no ip routing ! ! no ip cef no ip domain lookup ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/0 ip address 10.2.11.100 255.255.255.0 no ip route-cache duplex auto speed auto ! ! ip default-gateway 10.2.11.254 ip http server ip forward-protocol nd ! ! ! ! ! ! control-plane ! ! ! ! mgcp behavior g729-variants static-pt ! ! ! ! ! line con 0 privilege level 15 line aux 0 line vty 0 4 login ! ! end
OSPF 追加の設定と確認
基本的なOSPFの設定が完了した状態から、さらに以下の設定と確認を行います。
- Hello/Deadインターバルの確認
- OSPFコスト
- 等コストロードバランス
- DR/BDR
- ルート集約
Step1:Hello/Deadインターバルの確認
ネイバーの状態は定期的なHelloパケットの送受信で確認します。イーサネットのインタフェースでは、デフォルトのHello/Deadインターバルは10/40秒です。show ip ospf interfaceコマンドでHello/Deadインターバルを確認します。DSW111では、次のような状態です。
DSW111 show ip ospf interface
DSW111#show ip ospf interface Loopback0 is up, line protocol is up Internet Address 10.1.0.1/32, Area 1 Process ID 1, Router ID 10.1.0.1, Network Type LOOPBACK, Cost: 1 Loopback interface is treated as a stub Host Vlan11 is up, line protocol is up Internet Address 10.1.11.1/24, Area 1 Process ID 1, Router ID 10.1.0.1, Network Type BROADCAST, Cost: 1 Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 10.1.0.1, Interface address 10.1.11.1 No backup designated router on this network Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 -- omitted --
ネイバーのダウンを素早く検出するためには、Hello/Deadインターバルを短くして頻繁にHelloパケットを送受信するようにします。Helloパケットのトラフィックは増加しますが、パケットサイズや処理負荷はそれほど大きいものではありません。Hello/Deadインターバルを変更する際は、ネイバーで一致しなければいけないことに注意をしてください。
ここでは、Hello/Deadインターバルの値の確認だけとしています。
Step2:OSPFコストの確認
OSPFコストはインタフェースの帯域幅から自動的に計算されます。SVIでは、帯域幅は100Mbpsなので、OSPFコストは1です。目的のネットワークまでのコストは、累積して考えます。DSW111からVlan31 10.1.31.0/24のコストを確認すると、3であることがわかります。
DSW111 show ip route 10.1.31.0
DSW111#show ip route 10.1.31.0
Routing entry for 10.1.31.0/24
Known via "ospf 1", distance 110, metric 3, type intra area
Last update from 10.1.102.12 on Vlan102, 00:24:52 ago
Routing Descriptor Blocks:
* 10.1.102.12, from 10.1.0.5, 00:24:52 ago, via Vlan102
Route metric is 3, traffic share count is 1
10.1.101.11, from 10.1.0.5, 00:24:52 ago, via Vlan101
Route metric is 3, traffic share count is 1
Step3:コスト計算式の変更
1Gbpsや10Gbpsのインタフェースが珍しくなくなってきている現在、デフォルトの計算式では高速なインタフェースをOSPFコストに反映できません。100Mbps以上のインタフェースに対応できるようにOSPFを動作させているすべてのルータで、コスト計算式を変更します。
すべてのOSPFルータ コスト計算式の変更
router ospf 1 auto-cost reference-bandwidth 10000
Step4:OSPFコストの確認
コストの計算式を変更したあと、再度、OSPFコストを確認します。DSW111でshow ip ospf interfaceおよびshow ip route 10.1.31.0を確認します。
DSW111 show ip ospf interface/show ip route 10.1.31.0
DSW111#show ip ospf interface
Loopback0 is up, line protocol is up
Internet Address 10.1.0.1/32, Area 1
Process ID 1, Router ID 10.1.0.1, Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Vlan11 is up, line protocol is up
Internet Address 10.1.11.1/24, Area 1
Process ID 1, Router ID 10.1.0.1, Network Type BROADCAST, Cost: 100
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 10.1.0.1, Interface address 10.1.11.1
No backup designated router on this network
-- omitted --
DSW111#show ip route 10.1.31.0
Routing entry for 10.1.31.0/24
Known via "ospf 1", distance 110, metric 300, type intra area
Last update from 10.1.102.12 on Vlan102, 00:01:50 ago
Routing Descriptor Blocks:
10.1.102.12, from 10.1.0.5, 00:01:50 ago, via Vlan102
Route metric is 300, traffic share count is 1
* 10.1.101.11, from 10.1.0.5, 00:01:50 ago, via Vlan101
Route metric is 300, traffic share count is 1
Step5:等コストロードバランスの確認
各PCおよびSRVが接続されているVLANに対して、すべてのレイヤ3スイッチで通信経路が2つずつ確保されています。すべてのインタフェースのコストは同一のため、特別な設定を行わなくても等コストロードバランスの構成です。
DSW111およびBBSW1/BBSW2からSRVが接続されている10.1.31.0/24のルートを確認すると、次のようになります。
DSW111 show ip route 10.1.31.0
DSW111#show ip route 10.1.31.0
Routing entry for 10.1.31.0/24
Known via "ospf 1", distance 110, metric 300, type intra area
Last update from 10.1.102.12 on Vlan102, 00:01:50 ago
Routing Descriptor Blocks:
10.1.102.12, from 10.1.0.5, 00:01:50 ago, via Vlan102
Route metric is 300, traffic share count is 1
* 10.1.101.11, from 10.1.0.5, 00:01:50 ago, via Vlan101
Route metric is 300, traffic share count is 1
BBSW1 show ip route 10.1.31.0
BBSW1#show ip route 10.1.31.0
Routing entry for 10.1.31.0/24
Known via "ospf 1", distance 110, metric 200, type intra area
Last update from 10.1.109.1 on Vlan109, 00:07:19 ago
Routing Descriptor Blocks:
* 10.1.111.2, from 10.1.0.6, 00:07:19 ago, via Vlan111
Route metric is 200, traffic share count is 1
10.1.109.1, from 10.1.0.5, 00:07:19 ago, via Vlan109
Route metric is 200, traffic share count is 1
BBSW2 show ip route 10.1.31.0
BBSW2#show ip route 10.1.31.0
Routing entry for 10.1.31.0/24
Known via "ospf 1", distance 110, metric 200, type intra area
Last update from 10.1.110.1 on Vlan110, 00:08:02 ago
Routing Descriptor Blocks:
* 10.1.112.2, from 10.1.0.6, 00:08:02 ago, via Vlan112
Route metric is 200, traffic share count is 1
10.1.110.1, from 10.1.0.5, 00:08:02 ago, via Vlan110
Route metric is 200, traffic share count is 1
Step6:DR/BDRの設定
ほとんどのサブネットは、レイヤ3スイッチが2台だけ接続されています。そのため、DR/BDRの選択は気にする必要は特にありません。ただし、広域イーサネットのサブネットは複数のOSPFルータが接続されているため、DR/BDRを考慮します。
広域イーサネット1のDRをWSW11、BDRをWSW12とします。また、広域イーサネット2のDRをWSW12、BDRをWSW11とします。
WSW11 DR/BDRの設定
interface Vlan100 ip ospf priority 200 ! interface Vlan200 ip ospf priority 150
WSW12 DR/BDRの設定
interface Vlan100 ip ospf priority 150 ! interface Vlan200 ip ospf priority 200
OSPFプライオリティを設定したあと、WSW11～WSW22でclear ip ospf processでOSPFプロセスを再起動します。
Step7:DR/BDRの確認
WSW11、WSW12でOSPFプライオリティを変更したあとの広域イーサネット1、広域イーサネット2上のDR/BDRを確認します。
WSW11 show ip ospf interface
WSW11#show ip ospf interface vlan 100 Vlan100 is up, line protocol is up Internet Address 10.0.1.11/24, Area 0 Process ID 1, Router ID 10.1.0.11, Network Type BROADCAST, Cost: 100 Transmit Delay is 1 sec, State DR, Priority 200 Designated Router (ID) 10.1.0.11, Interface address 10.0.1.11 Backup Designated router (ID) 10.1.0.12, Interface address 10.0.1.12 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 -- omitted -- WSW11#show ip ospf interface vlan200 Vlan200 is up, line protocol is up Internet Address 10.0.2.11/24, Area 0 Process ID 1, Router ID 10.1.0.11, Network Type BROADCAST, Cost: 100 Transmit Delay is 1 sec, State BDR, Priority 150 Designated Router (ID) 10.1.0.12, Interface address 10.0.2.12 Backup Designated router (ID) 10.1.0.11, Interface address 10.0.2.11 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 -- omitted --
Step8:集約の設定
エリア1(拠点1)のABRであるWSW11、WSW12で拠点1のルートを10.1.0.0/16に集約します。同様にエリア2(拠点2)のABRであるWSW21、WSW22で拠点2のルートを10.2.0.0/16に集約します。
WSW11/WSW12 集約の設定
router ospf 1 area 1 range 10.1.0.0 255.255.0.0
WSW21/WSW22 集約の設定
router ospf 1 area 2 range 10.2.0.0 255.255.0.0
Step9:集約の確認
ABRでルーティングテーブルを見て、正しく集約されていることを確認します。
WSW11 show ip route 10.2.0.0
WSW11#show ip route 10.2.0.0
Routing entry for 10.2.0.0/16
Known via "ospf 1", distance 110, metric 101, type inter area
Last update from 10.0.1.21 on Vlan100, 00:02:06 ago
Routing Descriptor Blocks:
* 10.0.2.22, from 10.2.0.22, 00:02:06 ago, via Vlan200
Route metric is 101, traffic share count is 1
10.0.2.21, from 10.2.11.21, 00:02:06 ago, via Vlan200
Route metric is 101, traffic share count is 1
10.0.1.22, from 10.2.0.22, 00:02:06 ago, via Vlan100
Route metric is 101, traffic share count is 1
10.0.1.21, from 10.2.11.21, 00:02:06 ago, via Vlan100
Route metric is 101, traffic share count is 1
WSW21 show ip route 10.1.0.0
WSW21#show ip route 10.1.0.0
Routing entry for 10.1.0.0/16
Known via "ospf 1", distance 110, metric 101, type inter area
Last update from 10.0.1.12 on Vlan100, 00:04:23 ago
Routing Descriptor Blocks:
10.0.2.12, from 10.1.0.12, 00:04:23 ago, via Vlan200
Route metric is 101, traffic share count is 1
* 10.0.2.11, from 10.1.0.11, 00:04:23 ago, via Vlan200
Route metric is 101, traffic share count is 1
10.0.1.12, from 10.1.0.12, 00:04:23 ago, via Vlan100
Route metric is 101, traffic share count is 1
10.0.1.11, from 10.1.0.11, 00:04:23 ago, via Vlan100
Route metric is 101, traffic share count is 1
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- 3階層モデルLANのOSPFルーティング
- 演習:実践的なOSPFルーティング Part1:OSPFの基本設定
- 演習:実践的なOSPFルーティング Part2:デフォルトルートの生成
- 演習:実践的なOSPFルーティング Part3:スタブエリア
- 演習:実践的なOSPFルーティング Part4:ルート集約
- 演習:実践的なOSPFルーティング Part5:トラブルシューティング
- OSPF 設定ミスの切り分けと修正 Part1
- OSPF 設定ミスの切り分けと修正 Part2
- OSPF 設定ミスの切り分けと修正 Part3
- OSPF 設定ミスの切り分けと修正 Part4
- OSPF 設定ミスの切り分けと修正 Part5
- OSPF 設定ミスの切り分けと修正 Part6
- Cisco OSPFv3 for IPv4の設定と確認コマンド
- Cisco OSPFv3 for IPv4の設定例
- OSPFv3の設定例 [Cisco]
- OSPFv3 ルート集約の設定例 [Cisco]