實驗拓撲

實驗需求

R1、R2完成接口IPv6地址的配置；

R1、R2按圖示運行OSPF。R2的三個Loopback接口并不直接激活OSPFv3，而是以重發(fā)布的形式注入；

在R1、R2上分別執(zhí)行OSPF路由匯總，使得雙方的路由表中關于對方的Loopback只學習到一條匯總路由。

實驗步驟及配置

R1、R2完成接口IPv6地址的配置

R1的配置如下：

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[R1]?ipv6
[R1]?interface?gigabitEthernet0/0/0
[R1-GgabitEthernet0/0/0]?ipv6?enable
[R1-GgabitEthernet0/0/0]?ipv6?address?2001:1?64
[R1-GgabitEthernet0/0/0]?quit
[R1]?interface?loopback1
[R1-LoopBack1]?ipv6?enable
[R1-LoopBack1]?ipv6?address?20011::FFFF?64
[R1]?interface?loopback2
[R1-LoopBack2]?ipv6?enable
[R1-LoopBack2]?ipv6?address?20012::FFFF?64
[R1]?interface?loopback3
[R1-LoopBack3]?ipv6?enable
[R1-LoopBack3]?ipv6?address?20013::FFFF?64

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R2的配置如下：

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[R2]?ipv6
[R2]?interface?gigabitEthernet0/0/0
[R2-GgabitEthernet0/0/0]?ipv6?enable
[R2-GgabitEthernet0/0/0]?ipv6?address?2001:2?64
[R2-GgabitEthernet0/0/0]?quit
[R2]?interface?loopback1
[R2-LoopBack1]?ipv6?enable
[R2-LoopBack1]?ipv6?address?20011::FFFF?64
[R2]?interface?loopback2
[R2-LoopBack2]?ipv6?enable
[R2-LoopBack2]?ipv6?address?20012::FFFF?64
[R2]?interface?loopback3
[R2-LoopBack3]?ipv6?enable
[R2-LoopBack3]?ipv6?address?20013::FFFF?64

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R1、R2運行OSPFv3

R1的配置如下：

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[R1]?ospfv3?1
[R1-ospfv3-1]?router-id?1.1.1.1
[R1-ospfv3-1]?quit
[R1]?interface?gigabitEthernet0/0/0
[R1-GgabitEthernet0/0/0]?ospfv3?1?area?0
[R1]?interface?loopback?1
[R1-LoopBack1]?ospfv3?1?area?1
[R1]?interface?loopback?2
[R1-LoopBack2]?ospfv3?1?area?1
[R1]?interface?loopback?3
[R1-LoopBack3]?ospfv3?1?area?1

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R2的配置如下：

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[R2]?ospfv3?1
[R2-ospfv3-1]?router-id?2.2.2.2
[R2-ospfv3-1]?import-route?direct??#將直連路由重發(fā)布到OSPF
[R2-ospfv3-1]?quit
[R2]?interface?gigabitEthernet0/0/0
[R2-GgabitEthernet0/0/0]?ospfv3?1?area?0

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完成上述配置后，查看一下R1、R2的路由表：

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[R1]?display?ipv6?routing-table?protocol?ospfv3
Public?Routing?Table?:?OSPFv3
Summary?Count?:?7

OSPFv3?Routing?Table's?Status?:?
Summary?Count?:?3

Destination?:?20011::?PrefixLength?:?64
NextHop?:?FE80:FCFF4314?Preference?:?150
Cost?:?1?Protocol?:?OSPFv3ASE
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

Destination?:?20012::?PrefixLength?:?64
NextHop?:?FE80:FCFF4314?Preference?:?150
Cost?:?1?Protocol?:?OSPFv3ASE
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

Destination?:?20013::?PrefixLength?:?64
NextHop?:?FE80:FCFF4314?Preference?:?150
Cost?:?1?Protocol?:?OSPFv3ASE
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

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R1已經通過OSPFv3學習到R2的三個Loopback接口路由。

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[R2]?display?ipv6?routing-table?protocol?ospfv3
Public?Routing?Table?:?OSPFv3
Summary?Count?:?4
OSPFv3?Routing?Table's?Status?:?
Summary?Count?:?3
Destination?:?20011::FFFF?PrefixLength?:?128
NextHop?:?FE80:FCFF416B?Preference?:?10
Cost?:?1?Protocol?:?OSPFv3
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

Destination?:?20012::FFFF?PrefixLength?:?128
NextHop?:?FE80:FCFF416B?Preference?:?10
Cost?:?1?Protocol?:?OSPFv3
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

Destination?:?20013::FFFF?PrefixLength?:?128
NextHop?:?FE80:FCFF416B?Preference?:?10
Cost?:?1?Protocol?:?OSPFv3
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

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R2也已經學習到了R1的Loopback接口路由，這些路由在R2的路由表中以/128掩碼的形式存在，這是正常的，因為缺省情況下OSPF將Loopback接口視為stub host，因此以主機路由的形式通告之。

R1、R2部署OSPFv3路由匯總

首先在R1上部署路由匯總，將Area 1內的路由匯總成2001:/32。R1的配置如下：

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[R1]?ospfv3?1
[R1-ospfv3-1]?area?1
[R1-ospfv3-1-area-0.0.0.1]?abr-summary?2001:?32

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完成上述配置后，R2的路由表就變精簡了，R1不會再將自己Loopback接口的路由以明細的方式通告出去，而是通告一條匯總路由：2001:/32：

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[R2]?display?ipv6?routing-table?protocol?ospf
Public?Routing?Table?:?OSPFv3
Summary?Count?:?2
OSPFv3?Routing?Table's?Status?:?
Summary?Count?:?1
Destination?:?2001:?PrefixLength?:?32
NextHop?:?FE80:FCFF416B?Preference?:?10
Cost?:?1?Protocol?:?OSPFv3
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

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接著在ASBR R2上執(zhí)行路由匯總，這種路由匯總方式是對注入到OSPF的外部路由進行的路由匯總，匯總后的路由是2001:/32，R2的配置如下：

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[R2]?ospfv3?1
[R2-ospfv3-1]?asbr-summary?2001:?32

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完成上述配置后R1的路由表也精簡了：

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[R1]?display?ipv6?routing-table?protocol?ospfv3
Public?Routing?Table?:?OSPFv3
Summary?Count?:?5
OSPFv3?Routing?Table's?Status?:?
Summary?Count?:?1
Destination?:?2001:?PrefixLength?:?32
NextHop?:?FE80:FCFF4314?Preference?:?150
Cost?:?2?Protocol?:?OSPFv3ASE
RelayNextHop?:?::?TunnelID?:?0x0
Interface?:?GigabitEthernet0/0/0?Flags?:?D

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　審核編輯：湯梓紅