OSPF-LSA系列—LSA TYPE 3
2015-04-15 22:53
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通用属性:
类型TYPE、Link ID、ADV Router三者标示了LSA的唯一性
Age存在时间,最大为3600s,正常情况下不会超过1800s,30min周期更新,3600s没有更新会删掉LSA
Seq number范围是80000001-7FFFFFFF
Checksum说明LSA在传输过程有没有出现错误
Age、Seq number和Checksum三者标示了LSA的新旧程度
当多份LSA来到设备时会比较Age、Seq number和Checksum三者来选取一份放入LSDB表中
——————————————————————————————————————————
通告者:本区域ABR的router-id
传播范围:在区域间传播
内容:路由(网络号、掩码和开销)
——————————————————————————————————————————
ABR定义:设备至少有一个接口和area 0相连,还有其它接口和其它区域相连,并且和area 0相连的OSPF邻居到达FULL状态。
注意:ABR不能接收从非骨干区域传递过来的TYPE 3类路由(LSA存在,但是不能加入到路由表中)
在TYPE 3转TYPE 3的时候,如果本地(ABR)存在一条比转换的TYPE 3路由更优的话,该TYPE 3转TYPE 3不会执行
R3#show ip route
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O IA 1.1.1.1/32 [110/75] via 23.1.1.2, 00:13:02, Serial1/0
R3(config)#ip route 1.1.1.1 255.255.255.255 23.1.1.2 设置一条更优的路径
R3#show ip route
1.0.0.0/32 is subnetted, 1 subnets
S 1.1.1.1 [1/0] via 23.1.1.2
R4#debug ip routing
R4#
*Mar 1 00:18:38.363: RT: del 1.1.1.1/32 via 34.1.1.3, ospf metric [110/85]
*Mar 1 00:18:38.367: RT: delete subnet route to 1.1.1.1/32
*Mar 1 00:18:38.367: RT: NET-RED 1.1.1.1/32
*Mar 1 00:18:38.367: RT: delete network route to 1.0.0.0
*Mar 1 00:18:38.371: RT: NET-RED 1.0.0.0/8
R4#
——————————————————————————————————————————
![](https://img-blog.csdn.net/20150415225456435?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMzQyNjE2MQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
R4#show ip ospf database
OSPF Router with ID (0.0.0.4) (Process ID 100)
Summary Net Link States (Area 10)
Link ID ADV Router Age Seq# Checksum
2.2.2.2 0.0.0.3 331 0x80000001 0x00A749
3.3.3.3 0.0.0.3 341 0x80000001 0x00F636
12.1.1.0 0.0.0.3 325 0x80000002 0x00A838
23.1.1.0 0.0.0.3 341 0x80000001 0x00B62A
——————————————————————————————————————————
R4#show ip ospf database summary
OSPF Router with ID (0.0.0.4) (Process ID 100)
Summary Net Link States (Area 10)
Routing Bit Set on this LSA
LS age: 288
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 2.2.2.2 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000001
Checksum: 0xA749
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
Routing Bit Set on this LSA
LS age: 298
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 3.3.3.3 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000001
Checksum: 0xF636
Length: 28
Network Mask: /32
TOS: 0 Metric: 1
Routing Bit Set on this LSA
LS age: 285
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 12.1.1.0 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000002
Checksum: 0xA838
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
Routing Bit Set on this LSA
LS age: 308
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 23.1.1.0 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000001
Checksum: 0xB62A
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
——————————————————————————————————————————
将AGE置为3600s时,说明要删除这条路由
类型TYPE、Link ID、ADV Router三者标示了LSA的唯一性
Age存在时间,最大为3600s,正常情况下不会超过1800s,30min周期更新,3600s没有更新会删掉LSA
Seq number范围是80000001-7FFFFFFF
Checksum说明LSA在传输过程有没有出现错误
Age、Seq number和Checksum三者标示了LSA的新旧程度
当多份LSA来到设备时会比较Age、Seq number和Checksum三者来选取一份放入LSDB表中
——————————————————————————————————————————
通告者:本区域ABR的router-id
传播范围:在区域间传播
内容:路由(网络号、掩码和开销)
——————————————————————————————————————————
ABR定义:设备至少有一个接口和area 0相连,还有其它接口和其它区域相连,并且和area 0相连的OSPF邻居到达FULL状态。
注意:ABR不能接收从非骨干区域传递过来的TYPE 3类路由(LSA存在,但是不能加入到路由表中)
在TYPE 3转TYPE 3的时候,如果本地(ABR)存在一条比转换的TYPE 3路由更优的话,该TYPE 3转TYPE 3不会执行
R3#show ip route
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O IA 1.1.1.1/32 [110/75] via 23.1.1.2, 00:13:02, Serial1/0
R3(config)#ip route 1.1.1.1 255.255.255.255 23.1.1.2 设置一条更优的路径
R3#show ip route
1.0.0.0/32 is subnetted, 1 subnets
S 1.1.1.1 [1/0] via 23.1.1.2
R4#debug ip routing
R4#
*Mar 1 00:18:38.363: RT: del 1.1.1.1/32 via 34.1.1.3, ospf metric [110/85]
*Mar 1 00:18:38.367: RT: delete subnet route to 1.1.1.1/32
*Mar 1 00:18:38.367: RT: NET-RED 1.1.1.1/32
*Mar 1 00:18:38.367: RT: delete network route to 1.0.0.0
*Mar 1 00:18:38.371: RT: NET-RED 1.0.0.0/8
R4#
——————————————————————————————————————————
R4#show ip ospf database
OSPF Router with ID (0.0.0.4) (Process ID 100)
Summary Net Link States (Area 10)
Link ID ADV Router Age Seq# Checksum
2.2.2.2 0.0.0.3 331 0x80000001 0x00A749
3.3.3.3 0.0.0.3 341 0x80000001 0x00F636
12.1.1.0 0.0.0.3 325 0x80000002 0x00A838
23.1.1.0 0.0.0.3 341 0x80000001 0x00B62A
——————————————————————————————————————————
R4#show ip ospf database summary
OSPF Router with ID (0.0.0.4) (Process ID 100)
Summary Net Link States (Area 10)
Routing Bit Set on this LSA
LS age: 288
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 2.2.2.2 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000001
Checksum: 0xA749
Length: 28
Network Mask: /32
TOS: 0 Metric: 65
Routing Bit Set on this LSA
LS age: 298
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 3.3.3.3 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000001
Checksum: 0xF636
Length: 28
Network Mask: /32
TOS: 0 Metric: 1
Routing Bit Set on this LSA
LS age: 285
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 12.1.1.0 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000002
Checksum: 0xA838
Length: 28
Network Mask: /24
TOS: 0 Metric: 74
Routing Bit Set on this LSA
LS age: 308
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 23.1.1.0 (summary Network Number)
Advertising Router: 0.0.0.3
LS Seq Number: 80000001
Checksum: 0xB62A
Length: 28
Network Mask: /24
TOS: 0 Metric: 64
——————————————————————————————————————————
将AGE置为3600s时,说明要删除这条路由
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