玩转华为ENSP模拟器系列 | 配置OSPF的DR选择示例
素材来源:华为路由器配置指南
一边学习一边整理试验笔记,并与大家分享,侵权即删,谢谢支持!
附上汇总贴:玩转华为ENSP模拟器系列 | 合集_COCOgsta的博客-CSDN博客_ensp实验大全
目标
介绍在广播网络中,配置接口上的DR优先级进行DR选择的过程。
组网需求
在图1中,DeviceA接口的优先级为100,它是网络上的最高优先级,所以DeviceA被选为DR;DeviceC是优先级第二高的,被选为BDR;DeviceB的优先级为0,这意味着它将无法成为DR或BDR;DeviceD没有配置优先级,取缺省值1。
配置思路
- 在各路由器上配置OSPF基本功能,实现互连。
- 在各路由器上配置Router ID。
- 在缺省优先级情况下,查看各路由器DR或者BDR状态。
- 配置接口上的DR优先级,查看DR或者BDR状态。
操作步骤
- 配置各接口的IP地址(略)
- 配置OSPF基本功能
配置DeviceA
DeviceA:
router id 1.1.1.1
ospf 1area 0.0.0.0network 192.168.1.0 0.0.0.255
配置DeviceB
DeviceB:
router id 2.2.2.2
ospf 1area 0.0.0.0network 192.168.1.0 0.0.0.255
配置DeviceC
DeviceC:
router id 3.3.3.3
ospf 1area 0.0.0.0network 192.168.1.0 0.0.0.255
配置DeviceD
DeviceD:
router id 4.4.4.4
ospf 1area 0.0.0.0network 192.168.1.0 0.0.0.255
查看DR或者BDR的状态。
[~DeviceA]dis ospf peer
(M) Indicates MADJ neighborOSPF Process 1 with Router ID 1.1.1.1NeighborsArea 0.0.0.0 interface 192.168.1.1 (Eth1/0/0)'s neighborsRouter ID: 2.2.2.2 Address: 192.168.1.2 State: 2-Way Mode:Nbr is Slave Priority: 1DR: 192.168.1.4 BDR: 192.168.1.3 MTU: 0Dead timer due in 35 secRetrans timer interval: 5Neighbor is up for 00h00m00sNeighbor Up Time : 0000-00-00 00:00:00Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 192.168.1.1 (Eth1/0/0)'s neighborsRouter ID: 3.3.3.3 Address: 192.168.1.3 State: Full Mode:Nbr is Master Priority: 1DR: 192.168.1.4 BDR: 192.168.1.3 MTU: 0Dead timer due in 40 secRetrans timer interval: 5Neighbor is up for 00h02m22sNeighbor Up Time : 2019-12-11 11:52:34Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 192.168.1.1 (Eth1/0/0)'s neighborsRouter ID: 4.4.4.4 Address: 192.168.1.4 State: Full Mode:Nbr is Master Priority: 1DR: 192.168.1.4 BDR: 192.168.1.3 MTU: 0Dead timer due in 38 secRetrans timer interval: 5Neighbor is up for 00h02m22sNeighbor Up Time : 2019-12-11 11:52:34Authentication Sequence: [ 0 ]OSPF Process 65534 with Router ID 128.1.138.138NeighborsArea 0.0.0.0 interface 128.1.138.138 (DCN-Serial1/0/0:0)'s neighborsRouter ID: 128.1.138.141 Address: 128.1.138.141 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 33 secRetrans timer interval: 5Neighbor is up for 00h04m29sNeighbor Up Time : 2019-12-11 11:50:28Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 128.1.138.138 (DCN-Serial1/0/0:1)'s neighborsRouter ID: 128.1.138.139 Address: 128.1.138.139 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 37 secRetrans timer interval: 5Neighbor is up for 00h04m27sNeighbor Up Time : 2019-12-11 11:50:31Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 128.1.138.138 (DCN-Serial1/0/0:2)'s neighborsRouter ID: 128.1.138.137 Address: 128.1.138.137 State: Full Mode:Nbr is Slave Priority: 1DR: None BDR: None MTU: 0Dead timer due in 35 secRetrans timer interval: 5Neighbor is up for 00h04m28sNeighbor Up Time : 2019-12-11 11:50:29Authentication Sequence: [ 0 ]
[~DeviceA]
查看DeviceA的邻居信息,可以看到DR优先级(缺省为1)以及邻居状态,此时DeviceD为DR,DeviceC为BDR。
- 配置接口上的DR优先级
配置DeviceA。
DeviceA:
interface Ethernet1/0/0ospf dr-priority 100
配置DeviceB。
DeviceB:
interface Ethernet1/0/0ospf dr-priority 0
配置DeviceC。
DeviceC:
interface Ethernet1/0/0ospf dr-priority 2
查看DR或者BDR的状态。
[~DeviceD-ospf-1]display ospf peer
(M) Indicates MADJ neighborOSPF Process 1 with Router ID 4.4.4.4NeighborsArea 0.0.0.0 interface 192.168.1.4 (Eth1/0/0)'s neighborsRouter ID: 1.1.1.1 Address: 192.168.1.1 State: Full Mode:Nbr is Slave Priority: 100DR: 192.168.1.4 BDR: 192.168.1.3 MTU: 0Dead timer due in 37 secRetrans timer interval: 5Neighbor is up for 00h06m24sNeighbor Up Time : 2019-12-11 11:52:34Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 192.168.1.4 (Eth1/0/0)'s neighborsRouter ID: 2.2.2.2 Address: 192.168.1.2 State: Full Mode:Nbr is Slave Priority: 0DR: 192.168.1.4 BDR: 192.168.1.3 MTU: 0Dead timer due in 32 secRetrans timer interval: 5Neighbor is up for 00h06m24sNeighbor Up Time : 2019-12-11 11:52:34Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 192.168.1.4 (Eth1/0/0)'s neighborsRouter ID: 3.3.3.3 Address: 192.168.1.3 State: Full Mode:Nbr is Slave Priority: 2DR: 192.168.1.4 BDR: 192.168.1.3 MTU: 0Dead timer due in 38 secRetrans timer interval: 5Neighbor is up for 00h06m24sNeighbor Up Time : 2019-12-11 11:52:34Authentication Sequence: [ 0 ]OSPF Process 65534 with Router ID 128.1.138.137NeighborsArea 0.0.0.0 interface 128.1.138.137 (DCN-Serial1/0/0:0)'s neighborsRouter ID: 128.1.138.141 Address: 128.1.138.141 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 37 secRetrans timer interval: 5Neighbor is up for 00h08m12sNeighbor Up Time : 2019-12-11 11:50:48Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 128.1.138.137 (DCN-Serial1/0/0:1)'s neighborsRouter ID: 128.1.138.139 Address: 128.1.138.139 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 38 secRetrans timer interval: 5Neighbor is up for 00h08m13sNeighbor Up Time : 2019-12-11 11:50:48Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 128.1.138.137 (DCN-Serial1/0/0:2)'s neighborsRouter ID: 128.1.138.138 Address: 128.1.138.138 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 39 secRetrans timer interval: 5Neighbor is up for 00h08m30sNeighbor Up Time : 2019-12-11 11:50:29Authentication Sequence: [ 0 ]
[~DeviceD-ospf-1]
[~DeviceD-ospf-1]
- 重启OSPF进程
在各路由器的用户视图下,同时执行命令reset ospf 1 process,以重启OSPF进程。
- 验证配置结果
查看OSPF邻居状态。
<DeviceD>dis ospf peer
(M) Indicates MADJ neighborOSPF Process 1 with Router ID 4.4.4.4NeighborsArea 0.0.0.0 interface 192.168.1.4 (Eth1/0/0)'s neighborsRouter ID: 1.1.1.1 Address: 192.168.1.1 State: Full Mode:Nbr is Slave Priority: 100DR: 192.168.1.1 BDR: 192.168.1.3 MTU: 0Dead timer due in 30 secRetrans timer interval: 5Neighbor is up for 00h01m27sNeighbor Up Time : 2019-12-11 14:04:57Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 192.168.1.4 (Eth1/0/0)'s neighborsRouter ID: 2.2.2.2 Address: 192.168.1.2 State: 2-Way Mode:Nbr is Slave Priority: 0DR: 192.168.1.1 BDR: 192.168.1.3 MTU: 0Dead timer due in 32 secRetrans timer interval: 0Neighbor is up for 00h00m00sNeighbor Up Time : 0000-00-00 00:00:00Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 192.168.1.4 (Eth1/0/0)'s neighborsRouter ID: 3.3.3.3 Address: 192.168.1.3 State: Full Mode:Nbr is Slave Priority: 2DR: 192.168.1.1 BDR: 192.168.1.3 MTU: 0Dead timer due in 33 secRetrans timer interval: 5Neighbor is up for 00h01m27sNeighbor Up Time : 2019-12-11 14:04:57Authentication Sequence: [ 0 ]OSPF Process 65534 with Router ID 128.1.138.137NeighborsArea 0.0.0.0 interface 128.1.138.137 (DCN-Serial1/0/0:0)'s neighborsRouter ID: 128.1.138.141 Address: 128.1.138.141 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 32 secRetrans timer interval: 5Neighbor is up for 02h15m38sNeighbor Up Time : 2019-12-11 11:50:48Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 128.1.138.137 (DCN-Serial1/0/0:1)'s neighborsRouter ID: 128.1.138.139 Address: 128.1.138.139 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 35 secRetrans timer interval: 5Neighbor is up for 02h15m39sNeighbor Up Time : 2019-12-11 11:50:48Authentication Sequence: [ 0 ]Area 0.0.0.0 interface 128.1.138.137 (DCN-Serial1/0/0:2)'s neighborsRouter ID: 128.1.138.138 Address: 128.1.138.138 State: Full Mode:Nbr is Master Priority: 1DR: None BDR: None MTU: 0Dead timer due in 36 secRetrans timer interval: 5Neighbor is up for 02h15m56sNeighbor Up Time : 2019-12-11 11:50:29Authentication Sequence: [ 0 ]
<DeviceD>
查看OSPF接口的状态。
<DeviceA>dis ospf interface
(M) Indicates MADJ interfaceOSPF Process 1 with Router ID 1.1.1.1InterfacesArea: 0.0.0.0 (MPLS TE not enabled)Interface IP Address Type State Cost Pri Eth1/0/0 192.168.1.1 Broadcast DR 1 100 OSPF Process 65534 with Router ID 128.1.138.138InterfacesArea: 0.0.0.0 (MPLS TE not enabled)Interface IP Address Type State Cost Pri Loop2147483647 128.1.138.138 P2P P-2-P 0 1 Eth1/0/0.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/1.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/2.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/3.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/4.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/5.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/6.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/7.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/8.4094 128.1.138.138 P2P P-2-P 100 1 Eth1/0/9.4094 128.1.138.138 P2P P-2-P 100 1 DCN-Serial1/0/0:0 128.1.138.138 P2P P-2-P 100 1 DCN-Serial1/0/0:1 128.1.138.138 P2P P-2-P 100 1 DCN-Serial1/0/0:2 128.1.138.138 P2P P-2-P 100 1
<DeviceA>
<DeviceB>display ospf interface
(M) Indicates MADJ interfaceOSPF Process 1 with Router ID 2.2.2.2InterfacesArea: 0.0.0.0 (MPLS TE not enabled)Interface IP Address Type State Cost Pri Eth1/0/0 192.168.1.2 Broadcast DROther 1 0 OSPF Process 65534 with Router ID 128.1.138.141InterfacesArea: 0.0.0.0 (MPLS TE not enabled)Interface IP Address Type State Cost Pri Loop2147483647 128.1.138.141 P2P P-2-P 0 1 Eth1/0/0.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/1.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/2.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/3.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/4.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/5.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/6.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/7.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/8.4094 128.1.138.141 P2P P-2-P 100 1 Eth1/0/9.4094 128.1.138.141 P2P P-2-P 100 1 DCN-Serial1/0/0:0 128.1.138.141 P2P P-2-P 100 1 DCN-Serial1/0/0:1 128.1.138.141 P2P P-2-P 100 1 DCN-Serial1/0/0:2 128.1.138.141 P2P P-2-P 100 1
<DeviceB>
<DeviceB>
<DeviceB>
如果邻居的状态是Full,这说明它和邻居之间形成了邻接关系;如果停留在2-Way的状态,则说明两者都不是DR或BDR,两者之间不需要交换LSA。
如果OSPF接口的状态是DROther,则说明它既不是DR,也不是BDR。
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