usg ospf 路由聚合 ospf路由聚合配置

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mob64ca140fd7c1 2024-05-20 17:23:07

文章标签 usg ospf 路由聚合华为网络 Network 路由表 文章分类 云原生云计算

目标

举例说明通过OSPFv3 ABR实现路由聚合的配置方法。

组网需求

路由聚合是指将多条具有相同IPv6前缀的路由聚合成一条路由。当大规模部署OSPFv3网络时，可能会出现由于OSPFv3路由表规模过大而降低路由查找速度的现象，为了解决这个问题，可以配置路由聚合，减小路由表的规模，降低管理的复杂度。此外，如果被聚合的IPv6地址范围内的某条链路频繁Up和Down，该变化并不会通告到被聚合的IPv6地址范围外的设备。因此，路由聚合还可以避免网络中的路由振荡，在一定程度上提高了网络的稳定性。

如图1所示，所有设备上都运行OSPFv3。在ABR上对Area 1内的具有相同前缀（2001:DB8::）的路由聚合为一条路由2001:DB8::/32之后，ABR将只发布这一条路由到Area 0区域中，从而减小路由表的规模，降低管理的复杂度，并提高了网络的稳定性。

usg ospf 路由聚合 ospf路由聚合配置_Network

配置思路

配置各接口的IP地址，使网络互通。
在所有设备上使能OSPFv3的基本功能。
在ABR上配置OSPFv3 ABR路由聚合。

操作步骤

配置各接口的IP地址（略）
配置OSPFv3基本功能

配置Device A。

DeviceA:
ospfv3 1
 router-id 3.3.3.3
 area 0.0.0.1
interface Ethernet1/0/0
 ospfv3 1 area 0.0.0.1

配置Device B。

DeviceB:
ospfv3 1
 router-id 1.1.1.1
 area 0.0.0.0
interface Ethernet1/0/0
 ospfv3 1 area 0.0.0.0

配置Device C。

DeviceC:
ospfv3 1
 router-id 4.4.4.4
 area 0.0.0.1
interface Ethernet1/0/0
 ospfv3 1 area 0.0.0.1

配置ABR。

ABR:
ospfv3 1
 router-id 2.2.2.2
 area 0.0.0.0
 area 0.0.0.1
interface Ethernet1/0/2
 ospfv3 1 area 0.0.0.0
interface Ethernet1/0/0
 ospfv3 1 area 0.0.0.1
interface Ethernet1/0/1
 ospfv3 1 area 0.0.0.1

配置完成后，执行display ospfv3 peer命令，可以看到Device A、Device B和Device C与ABR之间建立了邻居关系。以ABR的显示结果为例：

[~ABR-Ethernet1/0/1]dis ospfv3 peer
OSPFv3 Process (1)
OSPFv3 Area (0.0.0.0)
Neighbor ID      Pri State            Dead Time  Interface          Instance ID
1.1.1.1            1 Full/DR          00:00:38   Eth1/0/2              0       
OSPFv3 Area (0.0.0.1)
Neighbor ID      Pri State            Dead Time  Interface          Instance ID
4.4.4.4            1 Full/DR          00:00:39   Eth1/0/0              0       
3.3.3.3            1 Full/DR          00:00:37   Eth1/0/1              0       
[~ABR-Ethernet1/0/1]

在ABR上执行display ospfv3 lsdb命令查看OSPFv3的链路状态数据库信息。Area 1的数据库中Inter-area-prefix LSA的信息没有进行聚合。因此发布到Area 0的路由没有经过聚合。

[~ABR-Ethernet1/0/1]dis ospfv3 lsdb
           OSPFv3 Router with ID (2.2.2.2) (Process 1)
               Link-LSA (Interface Eth1/0/2)
Link State ID   Origin Router    Age   Seq#       CkSum      Prefix
0.0.0.6         1.1.1.1          273   0x80000003 0xe645          1
0.0.0.9         2.2.2.2          272   0x80000002 0xc460          1
               Link-LSA (Interface Eth1/0/0)
Link State ID   Origin Router    Age   Seq#       CkSum      Prefix
0.0.0.5         2.2.2.2          251   0x80000002 0x920           1
0.0.0.5         4.4.4.4          252   0x80000003 0xb66a          1
               Link-LSA (Interface Eth1/0/1)
Link State ID   Origin Router    Age   Seq#       CkSum      Prefix
0.0.0.7         2.2.2.2          233   0x80000002 0xe640          1
0.0.0.5         3.3.3.3          234   0x80000003 0x9c8a          1
               Router-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum    Link
0.0.0.0         1.1.1.1          273   0x80000002 0x59b0      1
0.0.0.0         2.2.2.2          254   0x80000003 0x669a      1
               Network-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.6         1.1.1.1          273   0x80000001 0x4cc6
               Inter-Area-Prefix-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.2         2.2.2.2          254   0x80000001 0x9071
0.0.0.3         2.2.2.2          238   0x80000001 0x768b
               Intra-Area-Prefix-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum   Prefix Reference      
0.0.0.1         1.1.1.1          273   0x80000001 0xae20       1 Network-LSA    
               Router-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum    Link
0.0.0.0         2.2.2.2          233   0x80000003 0xb01e      2
0.0.0.0         3.3.3.3          234   0x80000002 0xa15a      1
0.0.0.0         4.4.4.4          252   0x80000002 0xd51e      1
               Network-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.5         3.3.3.3          234   0x80000001 0x7e85
0.0.0.5         4.4.4.4          252   0x80000001 0x9269
                
               Inter-Area-Prefix-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.1         2.2.2.2          255   0x80000001 0x7a8a
               Intra-Area-Prefix-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum   Prefix Reference      
0.0.0.1         3.3.3.3          235   0x80000001 0xe4d9       1 Network-LSA    
0.0.0.1         4.4.4.4          253   0x80000001 0x11a4       1 Network-LSA    
[~ABR-Ethernet1/0/1] 
[~ABR-Ethernet1/0/1]
[~ABR-Ethernet1/0/1]
[~ABR-Ethernet1/0/1]dis ospfv3 lsdb inter-prefix
           OSPFv3 Router with ID (2.2.2.2) (Process 1)
               Inter-Area-Prefix-LSA (Area 0.0.0.0)
  LS Age: 304
  LS Type: Inter-Area-Prefix-LSA
  Link State ID: 0.0.0.2
  Originating Router: 2.2.2.2
  LS Seq Number: 0x80000001
  Retransmit Count: 0
  Checksum: 0x9071
  Length: 36
   Metric: 1
   Prefix: 2001:DB8:3::/64
    Prefix Options: 0 (-|-|-|-|-)
  LS Age: 288
  LS Type: Inter-Area-Prefix-LSA
  Link State ID: 0.0.0.3
  Originating Router: 2.2.2.2
  LS Seq Number: 0x80000001
  Retransmit Count: 0
  Checksum: 0x768b
  Length: 36
   Metric: 1
   Prefix: 2001:DB8:2::/64
    Prefix Options: 0 (-|-|-|-|-)
               Inter-Area-Prefix-LSA (Area 0.0.0.1)
  LS Age: 304
  LS Type: Inter-Area-Prefix-LSA
  Link State ID: 0.0.0.1
  Originating Router: 2.2.2.2
  LS Seq Number: 0x80000001
  Retransmit Count: 0
  Checksum: 0x7a8a
  Length: 36
   Metric: 1
   Prefix: 2001:DB8:1::/64
    Prefix Options: 0 (-|-|-|-|-)
[~ABR-Ethernet1/0/1]

在ABR上配置路由聚合，将Area 1区域内具有相同前缀的路由聚合为一条路由2001:DB8::/32

ABR:
ospfv3 1
 area 0.0.0.1
  abr-summary 2001:DB8:: 32

验证配置结果

配置完路由聚合后，在ABR上执行display ospfv3 lsdb命令，可以看到Area 1区域内具有相同前缀的路由聚合成了一条路由2001:DB8::/32，这条路由发布到了Area 0区域中。

[~ABR-ospfv3-1]dis ospfv3 lsdb
           OSPFv3 Router with ID (2.2.2.2) (Process 1)
               Link-LSA (Interface Eth1/0/2)
Link State ID   Origin Router    Age   Seq#       CkSum      Prefix
0.0.0.6         1.1.1.1          421   0x80000003 0xe645          1
0.0.0.9         2.2.2.2          420   0x80000002 0xc460          1
               Link-LSA (Interface Eth1/0/0)
Link State ID   Origin Router    Age   Seq#       CkSum      Prefix
0.0.0.5         2.2.2.2          399   0x80000002 0x920           1
0.0.0.5         4.4.4.4          400   0x80000003 0xb66a          1
               Link-LSA (Interface Eth1/0/1)
Link State ID   Origin Router    Age   Seq#       CkSum      Prefix
0.0.0.7         2.2.2.2          381   0x80000002 0xe640          1
0.0.0.5         3.3.3.3          382   0x80000003 0x9c8a          1
               Router-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum    Link
0.0.0.0         1.1.1.1          421   0x80000002 0x59b0      1
0.0.0.0         2.2.2.2          402   0x80000003 0x669a      1
               Network-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.6         1.1.1.1          421   0x80000001 0x4cc6
               Inter-Area-Prefix-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.4         2.2.2.2          39    0x80000001 0x63c3
               Intra-Area-Prefix-LSA (Area 0.0.0.0)
Link State ID   Origin Router    Age   Seq#       CkSum   Prefix Reference      
0.0.0.1         1.1.1.1          421   0x80000001 0xae20       1 Network-LSA    
               Router-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum    Link
0.0.0.0         2.2.2.2          381   0x80000003 0xb01e      2
0.0.0.0         3.3.3.3          382   0x80000002 0xa15a      1
0.0.0.0         4.4.4.4          400   0x80000002 0xd51e      1
               Network-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.5         3.3.3.3          382   0x80000001 0x7e85
0.0.0.5         4.4.4.4          400   0x80000001 0x9269
               Inter-Area-Prefix-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum 
0.0.0.1         2.2.2.2          403   0x80000001 0x7a8a
               Intra-Area-Prefix-LSA (Area 0.0.0.1)
Link State ID   Origin Router    Age   Seq#       CkSum   Prefix Reference      
0.0.0.1         3.3.3.3          383   0x80000001 0xe4d9       1 Network-LSA    
0.0.0.1         4.4.4.4          401   0x80000001 0x11a4       1 Network-LSA    
[~ABR-ospfv3-1]  
[~ABR-ospfv3-1]  dis ospfv3 lsdb inter-prefix
           OSPFv3 Router with ID (2.2.2.2) (Process 1)
               Inter-Area-Prefix-LSA (Area 0.0.0.0)
  LS Age: 95
  LS Type: Inter-Area-Prefix-LSA
  Link State ID: 0.0.0.4
  Originating Router: 2.2.2.2
  LS Seq Number: 0x80000001
  Retransmit Count: 0
  Checksum: 0x63c3
  Length: 32
   Metric: 1
   Prefix: 2001:DB8::/32
    Prefix Options: 0 (-|-|-|-|-)
               Inter-Area-Prefix-LSA (Area 0.0.0.1)
  LS Age: 458
  LS Type: Inter-Area-Prefix-LSA
  Link State ID: 0.0.0.1
  Originating Router: 2.2.2.2
  LS Seq Number: 0x80000001
  Retransmit Count: 0
  Checksum: 0x7a8a
  Length: 36
   Metric: 1
   Prefix: 2001:DB8:1::/64
    Prefix Options: 0 (-|-|-|-|-)
[~ABR-ospfv3-1]

在ABR上执行命令display ospfv3 abr-summary-list，可以查看ABR对Area 1区域内的路由进行路由聚合的信息。

[~ABR-ospfv3-1]dis ospfv3 abr-summary-list 
OSPFv3 Process (1)
Area ID : 0.0.0.1
 Prefix                                 Prefix-Len   Matched          Status        
 2001:DB8::                             32           2 [Active]       Advertised    
[~ABR-ospfv3-1]
[~ABR-ospfv3-1]

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