配置BGP4+ 6PE功能示例-优快云博客

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配置6PE功能可将被分割的IPv6网络利用MPLS隧道技术连接起来。

组网需求

不连续的IPv6网络之间需要通信，且IPv6网络之间是IPv4/MPLS网络的情况下，BGP4+ 6PE是一种比较理想的方案。

如图1所示，CE1、CE2所在的IPv6网络之间没有直连链路，但有去往AS号为200的IPv4/MPLS网络的链路。CE1和CE2希望能够借助于IPv4/MPLS网络进行通信，这可以通过在PE1和PE2之间建立6PE对等体来解决。6PE对等体通过MP-BGP来发送从各自CE学来的IPv6路由，通过LDP LSP来转发IPv6数据。

图1 配置BGP4+ 6PE功能示例

本例中interface1，interface2，interface3，interface4分别代表GE 0/1/0，GE 0/2/0，Loopback0，Loopback1。

配置思路

采用如下的思路配置BGP4+ 6PE功能：

PE1与PE2之间配置OSPF路由协议，可以互相学到对端的Loopback接口地址。

骨干网上使能MPLS、MPLS LDP，使得PE之间建立LDP LSP。

在PE1和PE2之间配置6PE对等体。

PE与CE之间配置BGP4+，用来交互IPv6路由。

数据准备

为完成此配置例，需准备如下的数据：

各设备的Router ID。

各设备所在区域的AS号。

操作步骤

配置各接口的IPv4、IPv6地址，配置过程略
配置PE1和PE2之间的OSPF路由协议，使PE之间可以互相学习到去往对方Loopback的路由，配置过程请参考后面的配置文件
骨干网上使能MPLS、MPLS LDP，PE之间建立LDP LSP

# 配置PE1。

[~PE1] mpls lsr-id 2.2.2.2

[*PE1] mpls

[*PE1-mpls] quit

[*PE1] mpls ldp

[*PE1-mpls-ldp] quit

[*PE1] interface gigabitethernet0/2/0

[*PE1-GigabitEthernet0/2/0] mpls

[*PE1-GigabitEthernet0/2/0] mpls ldp

[*PE1-GigabitEthernet0/2/0] quit

[*PE1] commit

# 配置PE2。

[~PE2] mpls lsr-id 3.3.3.3

[*PE2] mpls

[*PE2-mpls] quit

[*PE2] mpls ldp

[*PE2-mpls-ldp] quit

[*PE2] interface gigabitethernet0/2/0

[*PE2-GigabitEthernet0/2/0] mpls

[*PE2-GigabitEthernet0/2/0] mpls ldp

[*PE2-GigabitEthernet0/2/0] quit

[*PE2] commit

配置完成后，PE上运行命令display mpls ldp session，可以看到PE之间的LDP会话已建立。

[*PE1] display mpls ldp session

LDP Session(s) in Public Network

Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDD:HH:MM) An asterisk (*) before a session means the session is being deleted.

--------------------------------------------------------------------------

PeerID Status LAM SsnRole SsnAge KASent/Rcv

--------------------------------------------------------------------------

3.3.3.3:0 Operational DU Passive 000:00:35 143/199

--------------------------------------------------------------------------

TOTAL: 1 Session(s) Found.

PE之间配置6PE对等体

# 配置PE1。

[~PE1] bgp 200

[*PE1-bgp] peer 3.3.3.3 as-number 200

[*PE1-bgp] peer 3.3.3.3 connect-interface LoopBack0

[*PE1-bgp] ipv6-family unicast

[*PE1-bgp-af-ipv6] import-route direct

[*PE1-bgp-af-ipv6] peer 3.3.3.3 enable

[*PE1-bgp-af-ipv6] peer 3.3.3.3 label-route-capability

[*PE1-bgp-af-ipv6] quit

[*PE1-bgp] quit

[*PE1] commit

# 配置PE2。

[~PE2] bgp 200

[*PE2-bgp] peer 2.2.2.2 as-number 200

[*PE2-bgp] peer 2.2.2.2 connect-interface LoopBack0

[*PE2-bgp] ipv6-family unicast

[*PE2-bgp-af-ipv6] import-route direct

[*PE2-bgp-af-ipv6] peer 2.2.2.2 enable

[*PE2-bgp-af-ipv6] peer 2.2.2.2 label-route-capability

[*PE2-bgp-af-ipv6] commit

[*PE2-bgp-af-ipv6] quit

[*PE2-bgp] quit

[*PE2] commit

# 配置完成后，PE上运行命令display bgp ipv6 peer可以看到PE之间的BGP对等体关系已建立。

[~PE1] display bgp ipv6 peer

BGP local router ID : 10.0.0.1

Local AS number : 200

Total number of peers : 2 Peers in established state : 2

Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv

3.3.3.3 4 200 1248 1342 0 18:06:28 Established 1

PE与CE之间配置BGP4+路由协议，用来交换各自的IPv6路由

# 配置CE1。

[~CE1] bgp 100

[*CE1-bgp] router-id 5.5.5.5

[*CE1-bgp] peer 2001:db8:1::2 as-number 200

[*CE1-bgp] ipv6-family unicast

[*CE1-bgp-af-ipv6] peer 2001:db8:1::2 enable

[*CE1-bgp-af-ipv6] network 2001:db8:5::5 128

[*CE1-bgp-af-ipv6] commit

[~CE1-bgp-af-ipv6] quit

[~CE1-bgp] quit

# 配置PE1。

[~PE1] bgp 200

[*PE1-bgp] peer 2001:db8:1::1 as-number 100

[*PE1-bgp] ipv6-family unicast

[*PE1-bgp-af-ipv6] peer 2001:db8:1::1 enable

[*PE1-bgp-af-ipv6] commit

[~PE1-bgp-af-ipv6] quit

[~PE1-bgp] quit

# 配置PE2。

[~PE2] bgp 200

[*PE2-bgp] peer 2001:db8:2::1 as-number 300

[*PE2-bgp] ipv6-family unicast

[*PE2-bgp-af-ipv6] peer 2001:db8:2::1 enable

[*PE2-bgp-af-ipv6] commit

[~PE2-bgp-af-ipv6] quit

[~PE2-bgp] quit

# 配置CE2。

[~CE2] bgp 300

[*CE2-bgp] router-id 6.6.6.6

[*CE2-bgp] peer 2001:db8:2::2 as-number 200

[*CE2-bgp] ipv6-family unicast

[*CE2-bgp-af-ipv6] peer 2001:db8:2::2 enable

[*CE2-bgp-af-ipv6] network 2001:db8:6::6 128

[*CE2-bgp-af-ipv6] commit

[~CE2-bgp-af-ipv6] quit

[~CE2-bgp] quit

配置完成后，PE或CE上运行命令display bgp ipv6 peer可以看到PE与CE之间的BGP对等体关系已建立。

# 以PE1的显示信息为例。

[~PE1] display bgp ipv6 peer

BGP local router ID : 10.0.0.1

Local AS number : 100

Total number of peers : 2 Peers in established state : 2

Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv

3.3.3.3 4 200 59 60 0 00:35:46 Established 1

2001:db8:1::1 4 100 40 45 0 00:06:16 Established 1

检查配置结果

上述配置完成后，CE之间可以相互学习到去往对端Loopback接口的路由，并能Ping通。

# 以CE1为例。

[~CE1] display ipv6 routing-table

Routing Table : _public_

Destinations : 8 Routes : 8

Destination : ::1 PrefixLength : 128

NextHop : ::1 Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : InLoopBack0 Flags : D

Destination : ::FFFF:127.0.0.0 PrefixLength : 104

NextHop : ::FFFF:127.0.0.0 Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : InLoopBack0 Flags : D

Destination : ::FFFF:127.0.0.0 PrefixLength : 128

NextHop : ::1 Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : InLoopBack0 Flags : D

Destination : 2001:db8:1:: PrefixLength : 64

NextHop : 2001:db8:1::1 Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : GigabitEthernet0/1/0 Flags : D

Destination : 2001:db8:1::1 PrefixLength : 128

NextHop : ::1 Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : GigabitEthernet0/1/0 Flags : D

Destination : 2001:db8:5::5 PrefixLength : 128

NextHop : ::1 Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : LoopBack2 Flags : D

Destination : 2001:db8:6::6 PrefixLength : 128

NextHop : 2001:db8:1::2 Preference : 255

Cost : 0 Protocol : BGP

RelayNextHop : 2001:db8:1::2 TunnelID : 0x0

Interface : GigabitEthernet0/1/0 Flags : RD

Destination : FE80:: PrefixLength : 10

NextHop : :: Preference : 0

Cost : 0 Protocol : Direct

RelayNextHop : :: TunnelID : 0x0

Interface : NULL0 Flags : D

<CE1> ping ipv6 -a 2001:db8:5::5 2001:db8:6::6

PING 2001:db8:6::6 : 56 data bytes, press CTRL_C to break

Reply from 2001:db8:6::6

bytes=56 Sequence=1 hop limit=62 time=8 ms

Reply from 2001:db8:6::6

bytes=56 Sequence=2 hop limit=62 time=2 ms

Reply from 2001:db8:6::6

bytes=56 Sequence=3 hop limit=62 time=4 ms

Reply from 2001:db8:6::6

bytes=56 Sequence=4 hop limit=62 time=3 ms

Reply from 2001:db8:6::6

bytes=56 Sequence=5 hop limit=62 time=4 ms

---2001:db8:6::6 ping statistics---

5 packet(s) transmitted

5 packet(s) received

0.00% packet loss

round-trip min/avg/max=2/4/8 ms

综上所述，通过配置6PE特性，CE1与CE2所在IPv6网络之间可以借助IPv4/MPLS骨干网进行通信。

配置文件

CE1的配置文件

sysname CE1

interface GigabitEthernet0/1/0

undo shutdown

ipv6 enable

ipv6 address 2001:db8:1::1/64

interface LoopBack1

ipv6 enable

ipv6 address 2001:db8:5::5/128

bgp 100

router-id 5.5.5.5

peer 2001:db8:1::2 as-number 200

ipv4-family unicast

undo synchronization

ipv6-family unicast

undo synchronization

network 2001:db8:5::5 128

peer 2001:db8:1::2 enable

return

PE1的配置文件

sysname PE1

mpls lsr-id 2.2.2.2

mpls

mpls ldp

interface GigabitEthernet0/1/0

undo shutdown

ipv6 enable

ipv6 address 2001:db8:1::2/64

interface GigabitEthernet0/2/0

undo shutdown

ip address 10.0.0.1 255.255.255.252

mpls

mpls ldp

interface LoopBack0

ip address 2.2.2.2 255.255.255.255

bgp 200

peer 3.3.3.3 as-number 200

peer 3.3.3.3 connect-interface LoopBack0

peer 2001:db8:1::1 as-number 100

ipv4-family unicast

undo synchronization

peer 3.3.3.3 enable

ipv6-family unicast

undo synchronization

import-route direct

peer 3.3.3.3 enable

peer 3.3.3.3 label-route-capability

peer 2001:db8:1::1 enable

ospf 1

area 0.0.0.0

network 2.2.2.2 0.0.0.0

network 10.0.0.0 0.0.0.3

return

PE2的配置文件

sysname PE2

mpls lsr-id 3.3.3.3

mpls

mpls ldp

interface GigabitEthernet0/1/0

undo shutdown

ipv6 enable

ipv6 address 2001:db8:2::2/64

interface GigabitEthernet0/2/0

undo shutdown

ip address 10.0.0.2 255.255.255.252

mpls

mpls ldp

interface LoopBack0

ip address 3.3.3.3 255.255.255.255

bgp 200

peer 2.2.2.2 as-number 200

peer 2.2.2.2 connect-interface LoopBack0

peer 2001:db8:2::1 as-number 300

ipv4-family unicast

undo synchronization

peer 2.2.2.2 enable

ipv6-family unicast

undo synchronization

import-route direct

peer 2.2.2.2 enable

peer 2.2.2.2 label-route-capability

peer 2001:db8:2::1 enable

ospf 1

area 0.0.0.0

network 3.3.3.3 0.0.0.0

network 10.0.0.0 0.0.0.3

return

CE2配置文件

sysname CE2

interface GigabitEthernet0/1/0

undo shutdown

ipv6 enable

ipv6 address 2001:db8:2::1/64

interface LoopBack1

ipv6 enable

ipv6 address 2001:db8:6::6/128

bgp 300

router-id 6.6.6.6

peer 2001:db8:2::2 as-number 200

ipv4-family unicast

undo synchronization

ipv6-family unicast

undo synchronization

network 2001:db8:6::6 128

peer 2001:db8:2::2 enable

return