【正文】 outepolicy] apply tag 20[RouterBroutepolicy] quit[RouterB] routepolicy isis2ospf permit node 30 [RouterBroutepolicy] quit步驟 6 在路由引入時(shí)應(yīng)用RoutePolicy 配置RouterB，設(shè)置在路由引入時(shí)應(yīng)用RoutePolicy。[RouterB] ospf[RouterBospf1] importroute isis 1 routepolicy isis2ospf[RouterBospf1] quit 查看RouterA的OSPF路由表，（Tag）為20，而其他路由的屬性未發(fā)生變化。[RouterA] display ospf routing OSPF Process 1 with Router ID Routing Tables Routing for Network Destination Cost Type NextHop AdvRouter Area Routing for ASEs Destination Cost Type Tag NextHop AdvRouter Routing for NSSAs Destination Cost Type Tag NextHop AdvRouter Total Nets: 5 Intra Area: 1 Inter Area: 0 ASE: 4 NSSA: 0結(jié)束配置文件l RouterA的配置文件 sysname RouterAinterface Pos1/0/0 linkprotocol ppp ip address ospf 1 area network returnl RouterB的配置文件 sysname RouterBacl number 2002 rule 5 permit source isis 1 islevel level2 networkentity interface Pos1/0/0 linkprotocol ppp ip address interface Pos2/0/0 linkprotocol ppp ip address isis enable 1ospf 1 importroute isis 1 routepolicy isis2ospf area network routepolicy isis2ospf permit node 10 ifmatch ipprefix prefixa apply cost 100routepolicy isis2ospf permit node 20 ifmatch acl 2002 apply tag 20routepolicy isis2ospf permit node 30ip ipprefix prefixa index 10 permit 24returnl RouterC的配置文件 sysname RouterCisis 1 islevel level2 networkentity interface GigabitEthernet1/0/0 ip address isis enable 1interface GigabitEthernet2/0/0 ip address isis enable 1interface GigabitEthernet3/0/0 ip address isis enable 1interface Pos4/0/0 linkprotocol ppp ip address isis enable 1return 配置公網(wǎng)IP FRR功能組網(wǎng)需求如圖104所示，要求在RouterT上配置備份出接口和備份下一跳，使鏈路B為鏈路A的備份。當(dāng)鏈路A出現(xiàn)故障時(shí)，業(yè)務(wù)可以快速切換到鏈路B上。圖104 配置公網(wǎng)IP FRR功能配置思路采用如下的思路配置公網(wǎng)IP FRR功能。l 在各路由器上使能OSPF基本功能。l 在RouterT和RouterC的接口GE3/0/0上配置較大的Cost值，使OSPF優(yōu)選鏈路A。l 在RouterT上配置RoutePolicy，配置備份下一跳和備份出接口，使能公網(wǎng)IP FRR功能，查看備份出接口和備份下一跳的信息。l IP FRR去使能后，查看備份出接口和備份下一跳的信息。數(shù)據(jù)準(zhǔn)備為完成此配置例，需準(zhǔn)備如下的數(shù)據(jù)。l OSPF接口的Cost值100。l 配置RoutePolicy名稱(chēng)和節(jié)點(diǎn)號(hào)。配置步驟步驟 1 配置各接口的IP地址（略）步驟 2 在RouterT、RouterA、RouterB和RouterC上配置OSPF（略）步驟 3 配置OSPF接口的Cost值 在RouterT的GigabitEthernet3/0/0接口上配置Cost值，使OSPF優(yōu)選鏈路A。[RouterT] interface gigabitethernet 3/0/0[RouterTGigabitEthernet3/0/0] ospf cost 100[RouterTGigabitEthernet3/0/0] quit 在RouterC的GigabitEthernet3/0/0接口上配置較大的Cost值，使OSPF優(yōu)選鏈路A。[RouterC] interface gigabitethernet 3/0/0[RouterCGigabitEthernet3/0/0] ospf cost 100[RouterCGigabitEthernet3/0/0] quit步驟 4 配置RoutePolicy 在RouterT上配置RoutePolicy，配置備份下一跳和備份出接口。同時(shí)配置ifmatch項(xiàng)，限制應(yīng)用范圍。[RouterT] ip ipprefix frr1 permit 24[RouterT] routepolicy ip_frr_rp permit node 10[RouterTroutepolicy] ifmatch ipprefix frr1[RouterTroutepolicy] apply backupnexthop [RouterTroutepolicy] apply backupinterface gigabitethernet 3/0/0[RouterTroutepolicy] quit步驟 5 使能公網(wǎng)IP FRR功能[RouterT] ip frr routepolicy ip_frr_rp 在RouterT上查看備份出接口和備份下一跳信息。RouterT display ip routingtable verboseDestination: Protocol: OSPF Process ID: 1 Preference: 10 Cost: 3 NextHop: Interface: GigabitEthernet2/0/0 RelyNextHop: Neighbour: Label: NULL Tunnel ID: 0x0 SecTunnel ID: 0x0 BkNextHop: BkInterface: GigabitEthernet3/0/0 BkLabel: 0 Tunnel ID: 0x0 SecTunnel ID: 0x0 State: Active Adv Age: 01h16m46s Tag: 0步驟 6 當(dāng)不需要IP FRR功能時(shí)，配置undo ip frr命令進(jìn)行去使能操作[RouterT] undo ip frr IP FRR去使能后，查看備份出接口和備份下一跳的信息。RouterT display ip routingtable verboseDestination: Protocol: OSPF Process ID: 1 Preference: 10 Cost: 3 NextHop: Interface: GigabitEthernet2/0/0 RelyNextHop: Neighbour: Label: NULL Tunnel ID: 0x0 SecTunnel ID: 0x0 BkNextHop: BkInterface: BkLabel: 0 Tunnel ID: 0x0 SecTunnel ID: 0x0 State: Active Adv Age: 01h16m46s Tag: 0結(jié)束配置文件l RouterT的配置文件 sysname RouterTip frr routepolicy ip_frr_rpinterface GigabitEthernet2/0/0 ip address interface GigabitEthernet3/0/0 ip address ospf cost 100 interface GigabitEthernet1/0/0 ip address interface NULL0ospf 1 area network network area network ip ipprefix frr1 permit 24routepolicy ip_frr_rp permit node 10 ifmatch ipprefix frrl apply backupnexthop apply backupinterface GigabitEthernet3/0/0returnl RouterA的配置文件 sysname RouterAinterface GigabitEthernet1/0/0 ip address interface GigabitEthernet2/0/0 ip address ospf 1 area network network returnl RouterB的配置文件 sysname RouterBinterface GigabitEthernet1/0/0 ip address interface GigabitEthernet2/0/0 ip address ospf 1 area network network returnl RouterC的配置文件 sysname RouterCinterface GigabitEthernet1/0/0 ip address interface GigabitEthernet2/0/0 ip address interface GigabitEthernet3/0/0 ip address ospf cost 100ospf 1 area network network area network return