组网及说明
组网图如下
配置步骤
R1相关配置
#
isis 1
network-entity 10.0000.0000.0001.00
#
address-family ipv4 unicast
import-route ospf 1 route-policy oti
#
ospf 1 router-id 1.1.1.1
import-route isis 1 type 1 route-policy ito
preference ase 10 route-policy pre
area 0.0.0.0
network 10.1.14.1 0.0.0.0
#
route-policy ito deny node 10
if-match tag 200
#
route-policy ito permit node 20
if-match ip address prefix-list zj
apply tag 400
#
route-policy oti deny node 10
if-match tag 300
#
route-policy oti permit node 20
if-match ip address prefix-list zj
apply tag 100
#
route-policy pre permit node 10
apply preference 150
#
ip prefix-list zj index 10 permit 10.1.1.0 24 greater-equal 32
#
R3相关配置
#
isis 1
network-entity 10.0000.0000.0003.00
#
address-family ipv4 unicast
import-route ospf 1 route-policy oti
#
ospf 1 router-id 3.3.3.3
import-route isis 1 type 1 route-policy ito
preference ase 10 route-policy pre
area 0.0.0.0
network 10.1.34.3 0.0.0.0
#
route-policy ito deny node 10
if-match tag 100
#
route-policy ito permit node 20
if-match ip address prefix-list zj
apply tag 300
#
route-policy oti deny node 10
if-match tag 400
#
route-policy oti permit node 20
if-match ip address prefix-list zj
apply tag 200
#
route-policy pre permit node 10
apply preference 150
#
ip prefix-list zj index 10 permit 10.1.1.0 24 greater-equal 32
#
配置关键点
路由的双点双向引入需要解决路由回馈(通过标签)和次优路径(优先级)2大问题
所以关键点在于路由引入的时候带上标签,以及合理规划路由的优先级
R1上:OSPF到ISIS打标签100;ISIS到OSPF打标签400;
从而oti策略里面拒绝标签300,打标签100;ito策略里面拒绝标签200,打标签400
R3上:ISIS到OSPF打标签300;OSPF到ISIS打标签200;
从而ito策略里面拒绝标签100,打标签300;oti策略里面拒绝标签400,打标签200
在R1上,OSPF中把300标签的路由优先级调整为150,其余的外部路由优先级调整为10
在R3上,OSPF中把400标签的路由优先级调整为150,其余的外部路由优先级调整为10