ospf与rip重分布引起的问题
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将ospf与rip相互引入。由于华为的ospf内部路由优先级为10，外部引入路由优先级为150 。RIP的优先级为100。所以RIP的路由优先级比ospf的外部引入的小，故RIP路由优先于ospf外部路由。
刚构建的拓扑，并不存在环路和次优路径，当ar2上的接口出现down的现象后，才会出现次优路径或者环路现象
当ar3
ar3
由于ar3
Ar4
样道理。
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 22 Routes : 22
Destination/Mask Proto Pre Cost Flags NextHop Interface
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 22 Routes : 22
Destination/Mask Proto Pre Cost Flags NextHop Interface [ar2-GigabitEthernet0/0/0]disp ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------ Routing Tables: Public
Destinations : 27 Routes : 31
Destination/Mask Proto Pre Cost Flags NextHop Interface
追踪路径：
环路现象，ar1和ar2之间的链路断链后。
[ar2-GigabitEthernet0/0/0]disp ip routing-table
Route Flags: R - relay, D - download to fib
sysname ar1
#
interface GigabitEthernet0/0/0
#
interface GigabitEthernet0/0/1 #
interface NULL0
#
interface LoopBack0
#
interface LoopBack1
#
#
#
#
#
ar1
Ar2
#
#
#
#
#
#
ar2
Ar3
sysname ar3
#
interface GigabitEthernet0/0/0
#
interface GigabitEthernet0/0/1 #
interface NULL0
#
interface LoopBack0
#
import-route rip 1 route-policy rip-in-ospf preference ase route-policy 172 150
#
rip 1
undo summary
version 2
import-route ospf 1 route-policy ospf-in-rip #
route-policy 172 permit node 10
if-match tag 100
#
#
#
Ar3
Ar4
#
#
#
#
#
import-route rip 1 route-policy rip-in-ospf preference ase route-policy 172 150
retransmission-limit
#
rip 1
undo summary
version 2
import-route ospf 1 route-policy ospf-in-rip #
route-policy 172 permit node 10
if-match tag 100
apply preference 80 #
route-policy ospf-in-rip deny node 10
if-match tag 350
#
route-policy ospf-in-rip permit node 20 apply tag 240
#
route-policy rip-in-ospf deny node 10
if-match tag 230
#
Ar4
Ar5
#
#
#
#
#
#
#
#
rip 1
#
Ar5