标签:外部 除了 不同 路由表 网络 proc direct 产生 一个
通告者:ASBR
传输范围:整个OSPF domain(域)
内容和功能:描述外部路由
[R6-ospf-1]import-route direct
<R1>dis ospf lsdb ase 6.6.6.6
OSPF Process 1 with Router ID 0.0.0.1
Link State Database
Type : External //LSA类型
Ls id : 6.6.6.6 //路由,目标网段地址
Adv rtr : 0.0.0.6 //产生五类LSA的ASBR的RID
Ls age : 109
Len : 36
Options : E
seq# : 80000001
chksum : 0xc5ec
Net mask : 255.255.255.255
TOS 0 Metric: 1 //度量值默认为1,OSPF外部路由类型2,cost在域内不累加,类型1的cost在区域内累加
E type : 2 //类型为外部类型2,类型1的cost在区域内累加
Forwarding Address : 0.0.0.0 //转发地址,即下一跳,如果是0.0.0.0的话就参照正常的路由(指向ASBR)
Tag : 1 //标识路由,通常用于路由策略,默认值为1(即使引入到其他OSPF进程依旧为1)
Priority : Medium
如果外部类型类型相同,cost相同,会优选较大的区域ID
外部路由可以负载
[R1-ospf-1]import-route direct cost 10 tag 11 type 1
[R1-ospf-1]dis ip rou 1.1.1.1 ver
Route Flags: R - relay, D - download to fib
Routing Table : Public
Summary Count : 1
Destination: 1.1.1.1/32
Protocol: O_ASE Process ID: 1
Preference: 150 Cost: 59
NextHop: 10.1.35.5 Neighbour: 0.0.0.0
State: Active Adv Age: 00h00m15s
Tag: 11 Priority: medium
Label: NULL QoSInfo: 0x0
IndirectID: 0x0
RelayNextHop: 0.0.0.0 Interface: GigabitEthernet0/0/0
TunnelID: 0x0 Flags: D
通告者:ASBR所在区域的ABR
传输范围:除了ASBR所在区域,整个OSPF domain(域)
内容和功能:描述ASBR的RID
ospf 1 router-id 5.5.5.5
peer 10.1.1.1
area 0.0.0.0
area 0.0.0.15
area 0.0.0.35
area 0.0.0.56
network 10.1.56.5 0.0.0.0
R5、SW3、R6配置RIP协议,在SW3上RIP和OSPF互相引入
// 普通区域的转发地址
[R1]dis ospf lsdb ase 6.6.6.6
OSPF Process 1 with Router ID 0.0.0.1
Link State Database
Type : External
Ls id : 6.6.6.6
Adv rtr : 10.1.15.3
Ls age : 216
Len : 36
Options : E
seq# : 80000001
chksum : 0x90eb
Net mask : 255.255.255.255
TOS 0 Metric: 1
E type : 2
Forwarding Address : 10.1.15.5 //非0,路由表的下一跳为转发地址,实现了转发的优化
Tag : 1
Priority : Medium
// 某些监管下,一定要求流量从一个接入、再转出
interface Vlanif15
ip address 10.1.15.3 255.255.255.0
ospf network-type p2p
ospf enable 1 area 0.0.0.15
[R1-GigabitEthernet0/0/1]dis ospf lsdb ase 6.6.6.6
OSPF Process 1 with Router ID 0.0.0.1
Link State Database
Type : External
Ls id : 6.6.6.6
Adv rtr : 10.1.15.3
Ls age : 68
Len : 36
Options : E
seq# : 80000002
chksum : 0xa90
Net mask : 255.255.255.255
TOS 0 Metric: 1
E type : 2
Forwarding Address : 0.0.0.0 //转发地址为0.0.0.0
Tag : 1
Priority : Medium
[R1-GigabitEthernet0/0/1]dis ip rou 6.6.6.6
Route Flags: R - relay, D - download to fib
Routing Table : Public
Summary Count : 1
Destination/Mask Proto Pre Cost Flags NextHop Interface
ospf
area 56
stub
不能接收外部的LSA,E=0,取而代之用一条默认路由去访问外部网络
[SW3]dis cu conf ospf
#
ospf 1 router-id 13.13.13.13
area 0.0.0.15
stub
[SW3]dis ip routing-table protocol ospf
Route Flags: R - relay, D - download to fib
Public routing table : OSPF
Destinations : 10 Routes : 14
OSPF routing table status : <Active>
Destinations : 10 Routes : 14
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 OSPF 10 2 D 10.1.15.1 Vlanif30
OSPF 10 2 D 10.1.15.5 Vlanif30 //area 15因为存在2个ABR,每个ABR都会产生默认路由的3类LSA(开销值默认为1),总的开销值为2
[R1]dis ospf lsdb summary 0.0.0.0
OSPF Process 1 with Router ID 0.0.0.1
Area: 0.0.0.0
Link State Database
Area: 0.0.0.15
Link State Database
Type : Sum-Net
Ls id : 0.0.0.0
Adv rtr : 0.0.0.1
Ls age : 357
Len : 28
Options : None
seq# : 80000001
chksum : 0x8dcf
Net mask : 0.0.0.0
Tos 0 metric: 1
Priority : Low
Type : Sum-Net
Ls id : 0.0.0.0
Adv rtr : 5.5.5.5
Ls age : 351
Len : 28
Options : None
seq# : 80000001
chksum : 0xfc4d
Net mask : 0.0.0.0
Tos 0 metric: 1
Priority : Low
//在ABR设备上实施no-summary
[R1]ospf
[R1-ospf-1]area 15
[R1-ospf-1-area-0.0.0.15]stub no-summary
[R5]ospf
[R5-ospf-1]area 15
[R5-ospf-1-area-0.0.0.15]stub no-summary
[SW3]dis ospf routing
OSPF Process 1 with Router ID 13.13.13.13
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
10.1.15.0/24 1 Transit 10.1.15.3 13.13.13.13 0.0.0.15
0.0.0.0/0 2 Inter-area 10.1.15.1 0.0.0.1 0.0.0.15
0.0.0.0/0 2 Inter-area 10.1.15.5 5.5.5.5 0.0.0.15
[SW3]dis ip routing-table protocol ospf
Route Flags: R - relay, D - download to fib
Public routing table : OSPF
Destinations : 1 Routes : 2
OSPF routing table status : <Active>
Destinations : 1 Routes : 2
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 OSPF 10 2 D 10.1.15.1 Vlanif30
OSPF 10 2 D 10.1.15.5 Vlanif30
验证转发的地址两种场景0.0.0.0和非0
标签:外部 除了 不同 路由表 网络 proc direct 产生 一个
原文地址:https://www.cnblogs.com/j-chao/p/13285646.html