还是没解决

这个问题的第一句话不太对吧，是想说“在路由器b上存在通过L1和L2两条链路（即连接路由器a的链路）到达网段1和网段2的等价ospf路由”？

如果是这个意思的话，可以通过建立多个ospf进程来实现（如果是模拟器可以随便玩，真实环境请谨慎部署）。

示例：

A：

 sysname A
#
ospf 1 router-id 1.1.1.1
import-route direct route-policy test0
area 0.0.0.0
network 10.0.12.1 0.0.0.0
#
ospf 2 router-id 11.11.11.11
import-route direct route-policy test1
area 0.0.0.0
network 10.0.112.1 0.0.0.0
#
interface LoopBack0
ip address 192.168.0.1 255.255.255.0
#
interface LoopBack1
ip address 192.168.1.1 255.255.255.0
#
interface GigabitEthernet0/0
port link-mode route
combo enable copper
ip address 10.0.12.1 255.255.255.0
#
interface GigabitEthernet0/1
port link-mode route
combo enable copper
ip address 10.0.112.1 255.255.255.0
#
route-policy test0 permit node 10
if-match ip address acl 3000
#
route-policy test1 permit node 10
if-match ip address acl 3001
#
acl advanced 3000
rule 0 permit ip source 192.168.0.0 0.0.0.255
rule 5 permit ip source 192.168.1.0 0.0.0.255
rule 1000 deny ip
#
acl advanced 3001
rule 0 permit ip source 192.168.1.0 0.0.0.255
rule 1000 deny ip
#

B：

 sysname B
#
ospf 1 router-id 2.2.2.2
area 0.0.0.0
network 0.0.0.0 255.255.255.255
#
interface GigabitEthernet0/0
port link-mode route
combo enable copper
ip address 10.0.12.2 255.255.255.0
#
interface GigabitEthernet0/1
port link-mode route
combo enable copper
ip address 10.0.112.2 255.255.255.0
#