配置IS-IS SR与LDP互通示例

NE20E-S V800R011C10 配置指南 - Segment Routing 02

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配置IS-IS SR与LDP互通示例

配置IS-IS SR与LDP互通，保证SR域与LDP域可以基于MPLS转发技术通信。

组网需求

如图2-8所示，PE1与P之间是新建的SR域，P与PE2之间是LDP域。现在需要PE1与PE2之间能够互访。

图2-8 SR与LDP互通组网图

本例中interface1和interface2分别代表GE0/1/0、GE0/2/0。

配置注意事项

在配置过程中，需注意以下事项：

SR域需要有设备能够把LDP域的前缀信息映射为SR域的SID。

配置思路

采用如下的思路配置IS-IS SR与LDP互通：

骨干网上配置IS-IS实现PE之间的互通。
骨干网上使能MPLS。PE1与P之间配置Segment Routing，建立SR LSP。P与PE2之间配置LDP，建立LDP LSP。
P上配置Mapping Server功能，将LDP域的前缀信息映射为SR域的SID。

数据准备

为完成此配置例，需准备如下的数据：

PE及P上的MPLS LSR-ID。
PE1及P上的SRGB范围。

操作步骤

配置接口的IP地址

# 配置PE1。

<HUAWEI> system-view

[~HUAWEI] sysname PE1

[*HUAWEI] commit

[~PE1] interface loopback 1

[*PE1-LoopBack1] ip address 1.1.1.9 32

[*PE1-LoopBack1] quit

[*PE1] interface gigabitethernet0/1/0

[*PE1-GigabitEthernet0/1/0] ip address 172.1.1.1 24

[*PE1-GigabitEthernet0/1/0] quit

[*PE1] commit

# 配置P。

<HUAWEI> system-view

[~HUAWEI] sysname P

[*HUAWEI] commit

[~P] interface loopback 1

[*P-LoopBack1] ip address 2.2.2.9 32

[*P-LoopBack1] quit

[*P] interface gigabitethernet0/1/0

[*P-GigabitEthernet0/1/0] ip address 172.1.1.2 24

[*P-GigabitEthernet0/1/0] quit

[*P] interface gigabitethernet0/2/0

[*P-GigabitEthernet0/2/0] ip address 172.2.1.1 24

[*P-GigabitEthernet0/2/0] quit

[*P] commit

# 配置PE2。

<HUAWEI> system-view

[~HUAWEI] sysname PE2

[*HUAWEI] commit

[~PE2] interface loopback 1

[*PE2-LoopBack1] ip address 3.3.3.9 32

[*PE2-LoopBack1] quit

[*PE2] interface gigabitethernet0/1/0

[*PE2-GigabitEthernet0/1/0] ip address 172.2.1.2 24

[*PE2-GigabitEthernet0/1/0] quit

[*PE2] commit

在骨干网上配置IGP协议，实现骨干网PE和P的互通

本例中以IS-IS为例进行说明。

# 配置PE1。

[~PE1] isis 1

[*PE1-isis-1] is-level level-1

[*PE1-isis-1] network-entity 10.0000.0000.0001.00

[*PE1-isis-1] quit

[*PE1] commit

[*PE1] interface loopback 1

[*PE1-LoopBack1] isis enable 1

[*PE1-LoopBack1] quit

[*PE1] interface gigabitethernet0/1/0

[*PE1-GigabitEthernet0/1/0] isis enable 1

[*PE1-GigabitEthernet0/1/0] quit

[*PE1] commit

# 配置P。

[~P] isis 1

[*P-isis-1] is-level level-1

[*P-isis-1] network-entity 10.0000.0000.0002.00

[*P-isis-1] quit

[*P] commit

[~P] interface loopback 1

[*P-LoopBack1] isis enable 1

[*P-LoopBack1] quit

[*P] interface gigabitethernet0/1/0

[*P-GigabitEthernet0/1/0] isis enable 1

[*P-GigabitEthernet0/1/0] quit

[*P] interface gigabitethernet0/2/0

[*P-GigabitEthernet0/2/0] isis enable 1

[*P-GigabitEthernet0/2/0] quit

[*P] commit

# 配置PE2。

[~PE2] isis 1

[*PE2-isis-1] is-level level-1

[*PE2-isis-1] network-entity 10.0000.0000.0003.00

[*PE2-isis-1] quit

[*PE2] commit

[~PE2] interface loopback 1

[*PE2-LoopBack1] isis enable 1

[*PE2-LoopBack1] quit

[*PE2] interface gigabitethernet0/1/0

[*PE2-GigabitEthernet0/1/0] isis enable 1

[*PE2-GigabitEthernet0/1/0] quit

[*PE2] commit

在骨干网上配置MPLS基本能力

# 配置PE1。

[~PE1] mpls lsr-id 1.1.1.9

[*PE1] mpls

[*PE1-mpls] commit

[~PE1-mpls] quit

# 配置P。

[~P] mpls lsr-id 2.2.2.9

[*P] mpls

[*P-mpls] commit

[~P-mpls] quit

[*P] interface gigabitethernet0/2/0

[*P-GigabitEthernet0/2/0] mpls

[*P-GigabitEthernet0/2/0] quit

[*P] commit

# 配置PE2。

[~PE2] mpls lsr-id 3.3.3.9

[*PE2] mpls

[*PE2-mpls] commit

[~PE2-mpls] quit

[*PE2] interface gigabitethernet0/1/0

[*PE2-GigabitEthernet0/1/0] mpls

[*PE2-GigabitEthernet0/1/0] quit

[*PE2] commit

在骨干网上PE1与P之间配置Segment Routing

# 配置PE1。

[~PE1] segment-routing

[*PE1-segment-routing] tunnel-prefer segment-routing

[*PE1-segment-routing] quit

[*PE1] commit

[~PE1] isis 1

[*PE1-isis-1] cost-style wide

[*PE1-isis-1] segment-routing mpls

[*PE1-isis-1] segment-routing global-block 160000 161000

[*PE1-isis-1] quit

[*PE1] interface loopback 1

[*PE1-LoopBack1] isis prefix-sid index 10

[*PE1-LoopBack1] quit

[*PE1] commit

# 配置P。

[~P] segment-routing

[*P-segment-routing] tunnel-prefer segment-routing

[*P-segment-routing] quit

[*P] commit

[~P] isis 1

[*P-isis-1] cost-style wide

[*P-isis-1] segment-routing mpls

[*P-isis-1] segment-routing global-block 160000 161000

[*P-isis-1] quit

[*P] interface loopback 1

[*P-LoopBack1] isis prefix-sid index 20

[*P-LoopBack1] quit

[*P] commit

在PE2与P之间建立LDP LSP

# 配置P。

[~P] mpls ldp

[*P-mpls-ldp] commit

[~P-mpls-ldp] quit

[*P] interface gigabitethernet0/2/0

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

[*P-GigabitEthernet0/2/0] quit

[*P] commit

# 配置PE2。

[~PE2] mpls ldp

[*PE2-mpls-ldp] commit

[~PE2-mpls-ldp] quit

[*PE2] interface gigabitethernet0/1/0

[*PE2-GigabitEthernet0/1/0] mpls ldp

[*PE2-GigabitEthernet0/1/0] quit

[*PE2] commit

在P设备上配置Mapping Server功能，配置SR与LDP互通

# 配置P。

[~P] segment-routing

[*P-segment-routing] mapping-server prefix-sid-mapping 3.3.3.9 32 22

[*P-segment-routing] quit

[*P] commit

[~P] isis 1

[*P-isis-1] segment-routing mapping-server send

[*P-isis-1] quit

[*P] commit

[~P] mpls

[*P-mpls] lsp-trigger segment-routing-interworking best-effort host

[*P-mpls] commit

[~P-mpls] quit

检查配置结果

在SR设备上执行display segment-routing prefix mpls forwarding命令，查看Segment Routing的标签转发表信息。

# 以P的显示为例：

[~P] display segment-routing prefix mpls forwarding

Segment Routing Prefix MPLS Forwarding Information
--------------------------------------------------------------
Role : I-Ingress, T-Transit, E-Egress, I&T-Ingress And Transit

Prefix Label OutLabel Interface NextHop Role MPLSMtu Mtu State 
--------------------------------------------------------------------------------------------------------------
3.3.3.9/32 160022 --- Mapping LDP --- E --- --- Active 

Total information(s): 1

可以看到存在3.3.3.9/32转发表项，且出接口是Mapping LDP，表明在P设备上SR LSP与MPLS LDP LSP粘连成功。

# PE间能够相互Ping通，例如：PE1能够Ping通PE2（3.3.3.9）。

[~PE1] ping lsp segment-routing ip 3.3.3.9 32 version draft2 remote 3.3.3.9

 LSP PING FEC: IPV4 PREFIX 3.3.3.9/32 : 100  data bytes, press CTRL_C to break
    Reply from 3.3.3.9: bytes=100 Sequence=1 time=72 ms
    Reply from 3.3.3.9: bytes=100 Sequence=2 time=34 ms
    Reply from 3.3.3.9: bytes=100 Sequence=3 time=50 ms
    Reply from 3.3.3.9: bytes=100 Sequence=4 time=50 ms
    Reply from 3.3.3.9: bytes=100 Sequence=5 time=34 ms
  --- FEC: IPV4 PREFIX 3.3.3.9 ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 34/48/72 ms

配置文件

PE1的配置文件

#
sysname PE1
#
mpls lsr-id 1.1.1.9
#
mpls
#
segment-routing
 tunnel-prefer segment-routing
#
isis 1
 cost-style wide
 network-entity 10.0000.0000.0001.00
 segment-routing mpls
 segment-routing global-block 160000 161000
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 192.1.1.1 255.255.255.0
 isis enable 1
#               
interface LoopBack1
 ip address 1.1.1.9 255.255.255.255
 isis enable 1  
 isis prefix-sid index 10
#
return

P的配置文件

#
sysname P
#
mpls lsr-id 2.2.2.9
#
mpls
 lsp-trigger segment-routing-interworking best-effort host
#
mpls ldp
#
segment-routing
 tunnel-prefer segment-routing
 mapping-server prefix-sid-mapping 3.3.3.9 32 22 
#
isis 1
 cost-style wide
 network-entity 10.0000.0000.0002.00
 segment-routing mpls
 segment-routing global-block 160000 161000
 segment-routing mapping-server send 
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.1.1.2 255.255.255.0
 isis enable 1
#
interface GigabitEthernet0/2/0
 undo shutdown
 ip address 172.2.1.1 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack1
 ip address 2.2.2.9 255.255.255.255
 isis enable 1
 isis prefix-sid index 20
#
return

PE2的配置文件

#
sysname PE2
#
mpls lsr-id 3.3.3.9
#
mpls
#
mpls ldp
#
isis 1
 cost-style wide
 network-entity 10.0000.0000.0003.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.2.1.2 255.255.255.0
 isis enable 1
 mpls
 mpls ldp
#
interface LoopBack1
 ip address 3.3.3.9 255.255.255.255
 isis enable 1
#
return

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更新时间：2020-02-07

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组网需求

配置注意事项

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数据准备

操作步骤

配置文件

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