网络工程 - 用于在 EIGRP 中操作度量的路由图 - 吾爱随笔录

我有以下设置

R1 --- R2 --- R3 --- R4 --- R5

从 R1 和 R5 通告相同的网络。两条路径 R1-R2 和 R4-R5 之间的延迟存在一些差异。因此，来自 R1 的路由被 R3 视为首选路径，R3 了解了这两条路由。这是 R3 的拓扑输出：

R3#show ip eigrp topology 172.16.244.0/24 | include from|Composite metric|Total delay|Originating router|tag is|Minimum bandwidth
  172.27.0.1 (GigabitEthernet0/1), from 172.27.0.1, Send flag is 0x0
      Composite metric is (3285401600/3284746240), route is Internal
        Minimum bandwidth is 1000000 Kbit
        Total delay is 50121250000 picoseconds
        Originating router is 172.16.244.2
        Internal tag is 20
  172.26.0.1 (GigabitEthernet0/0), from 172.26.0.1, Send flag is 0x0
      Composite metric is (3286056960/3285401600), route is Internal
        Minimum bandwidth is 1000000 Kbit
        Total delay is 50131250000 picoseconds
        Originating router is 172.16.244.3
        Internal tag is 20

如您所见，两条路由的路由标记均为 20。在 R4 上，我有以下路由映射配置：

R4#show running-config | section route-map
route-map VPNMAIN permit 10
 match tag 25
 set metric 1000000 10 255 1 1500
route-map VPNMAIN permit 20
R4#show running-config | s r e
router eigrp LAN
 !
 address-family ipv4 unicast autonomous-system 1
  !
  topology base
   distribute-list route-map VPNMAIN in 
   distribute-list route-map VPNMAIN out 
  exit-af-topology
  network 172.16.0.0 0.15.255.255
  eigrp default-route-tag 20
 exit-address-family

所以我想捕获所有路由标签为 25 的路由，并将指标操作为更好的值。我想要实现的是，如果 R3 带有路由标签 25，则 R3 更喜欢来自 R5 的路由。我不确定我必须在哪个方向（进出）映射分发列表以实现我想要的。回到主题。我更改了 R5 上的路由标签：

R5#configure terminal  
Enter configuration commands, one per line.  End with CNTL/Z.
R5(config)#router eigrp LAN
R5(config-router)#address-family ipv4 unicast autonomous-system 1
R5(config-router-af)#eigrp default-route-tag 25
*Sep 22 14:20:45.147: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.19.0.2 (GigabitEthernet0/0) is resync: default route tag configured
R5(config-router-af)#end

但 R3 似乎没有任何变化。新的路由标签可见，但指标仍然相同。

R3#show ip eigrp topology 172.16.244.0/24 | include from|Composite metric|Total delay|Originating router|tag is|Minimum bandwidth
  172.27.0.1 (GigabitEthernet0/1), from 172.27.0.1, Send flag is 0x0
      Composite metric is (3285401600/3284746240), route is Internal
        Minimum bandwidth is 1000000 Kbit
        Total delay is 50121250000 picoseconds
        Originating router is 172.16.244.2
        Internal tag is 20
  172.26.0.1 (GigabitEthernet0/0), from 172.26.0.1, Send flag is 0x0
      Composite metric is (3286056960/3285401600), route is Internal
        Minimum bandwidth is 1000000 Kbit
        Total delay is 50131250000 picoseconds
        Originating router is 172.16.244.3
        Internal tag is 25

我观察到的东西。路线图似乎不匹配任何东西。不确定如果用作分发列表时没有匹配项是否正常：

R4#show route-map 
route-map VPNMAIN, permit, sequence 10
  Match clauses:
     tag 25 
  Set clauses:
    metric 1000000 10 255 1 1500
  Policy routing matches: 0 packets, 0 bytes
route-map VPNMAIN, permit, sequence 20
  Match clauses:
  Set clauses:
  Policy routing matches: 0 packets, 0 bytes

我错过了什么？我怎样才能实现我的目标？我使用默认的 K 值（带宽和延迟）