实验 MPLS LDP配置

一、学习目的

掌握启用和关闭MPLS的方法

掌握启用和关闭MPLS LDP配置方法

掌握使用MPLS LDP配置LSP的方法

二、拓扑图

三、场景

你是公司的网管员，公司的网络了IP网络，为解决IP网络转发性能低下问题，决定使用MPLS技术来提高
路由器的转发速度，而静态LSP由管理员手式配置，LDP是专为标签发布而制定的标签分发协议
，为了配置灵活LDP来建议MPLS LSP

步骤一、基本配置与IP编址

给所有路由器和交换机配置IP地址和掩码

AR1配置脚本

sys
sysname AR1 
int g0/0/1
ip add 10.0.1.1 24
int s1/0/0
ip add 10.0.12.1 24
int lo0
ip add 2.2.2.2 24
dis ip int br


AR2配置脚本

sys
sysname AR2 
int s1/0/0 
ip add 10.0.12.2 24
int s2/0/0
ip add 10.0.23.2 24
int lo0
ip add 3.3.3.3 24
dis ip int br

AR3配置脚本 

sys 
sysname AR3 
int s2/0/0
ip add 10.0.23.3 24
int g0/0/1
ip add 10.0.2.1 24
int lo0
ip add 4.4.4.4 24
dis ip int br 

SW1配置脚本

sys 
sysname SW1
int vlanif 1
ip add 10.0.1.2 24

sw2配置脚本 
sys 
sysname SW2
int vlanif 1
ip add 10.0.2.2 24

步骤二、配置单区域OSPF

配置10.0.12.0/24
10.0.23.0/24
10.0.1.0/24
10.0.2.0/24四个网段属于OSPF区域0

AR1 
sys
ospf 1 router-id 2.2.2.2
area 0
network 10.0.1.0 0.0.0.255
network 10.0.12.0 0.0.0.255
network 2.2.2.0 0.0.0.255


AR2 
sys 
ospf 1 router-id 3.3.3.3
area 0
network 10.0.12.0 0.0.0.255
network 10.0.23.0 0.0.0.255
network 3.3.3.0 0.0.0.255
AR3 
sys 
ospf 1 router-id 4.4.4.4
area 0
network 10.0.23.0 0.0.0.255
network 10.0.2.0 0.0.0.255
network 4.4.4.0 0.0.0.255
dis ospf brief

SW1

sys 
ospf 1 router-id 1.1.1.1
area 0
network 10.0.1.0 0.0.0.255

SW2

sys 
ospf 1 router-id 5.5.5.5
area 0
network 10.0.2.0 0.0.0.255

配置完成后，查看设备的路由表，并测试全网的连通性

[AR2]dis ip routing-table 
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 17 Routes : 17

Destination/Mask Proto Pre Cost Flags NextHop Interface

3.3.3.0/24 Direct 0 0 D 3.3.3.3 LoopBack0
3.3.3.3/32 Direct 0 0 D 127.0.0.1 LoopBack0
3.3.3.255/32 Direct 0 0 D 127.0.0.1 LoopBack0
10.0.1.0/24 OSPF 10 49 D 10.0.12.1 Serial1/0/0
10.0.2.0/24 OSPF 10 49 D 10.0.23.3 Serial2/0/0
10.0.12.0/24 Direct 0 0 D 10.0.12.2 Serial1/0/0
10.0.12.1/32 Direct 0 0 D 10.0.12.1 Serial1/0/0
10.0.12.2/32 Direct 0 0 D 127.0.0.1 Serial1/0/0
10.0.12.255/32 Direct 0 0 D 127.0.0.1 Serial1/0/0
10.0.23.0/24 Direct 0 0 D 10.0.23.2 Serial2/0/0
10.0.23.2/32 Direct 0 0 D 127.0.0.1 Serial2/0/0
10.0.23.3/32 Direct 0 0 D 10.0.23.3 Serial2/0/0
10.0.23.255/32 Direct 0 0 D 127.0.0.1 Serial2/0/0
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0


[SW1]ping 10.0.2.2
PING 10.0.2.2: 56 data bytes, press CTRL_C to break
Reply from 10.0.2.2: bytes=56 Sequence=1 ttl=252 time=200 ms
Reply from 10.0.2.2: bytes=56 Sequence=2 ttl=252 time=60 ms
Reply from 10.0.2.2: bytes=56 Sequence=3 ttl=252 time=50 ms
Reply from 10.0.2.2: bytes=56 Sequence=4 ttl=252 time=70 ms
Reply from 10.0.2.2: bytes=56 Sequence=5 ttl=252 time=60 ms

--- 10.0.2.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 50/88/200 ms

[AR2]ping 10.0.1.2
PING 10.0.1.2: 56 data bytes, press CTRL_C to break
Reply from 10.0.1.2: bytes=56 Sequence=1 ttl=254 time=70 ms
Reply from 10.0.1.2: bytes=56 Sequence=2 ttl=254 time=20 ms
Reply from 10.0.1.2: bytes=56 Sequence=3 ttl=254 time=40 ms
Reply from 10.0.1.2: bytes=56 Sequence=4 ttl=254 time=50 ms
Reply from 10.0.1.2: bytes=56 Sequence=5 ttl=254 time=20 ms

--- 10.0.1.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 20/40/70 ms

[AR2]ping 10.0.2.2
PING 10.0.2.2: 56 data bytes, press CTRL_C to break
Reply from 10.0.2.2: bytes=56 Sequence=1 ttl=254 time=50 ms
Reply from 10.0.2.2: bytes=56 Sequence=2 ttl=254 time=20 ms
Reply from 10.0.2.2: bytes=56 Sequence=3 ttl=254 time=20 ms
Reply from 10.0.2.2: bytes=56 Sequence=4 ttl=254 time=30 ms
Reply from 10.0.2.2: bytes=56 Sequence=5 ttl=254 time=20 ms

--- 10.0.2.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 20/28/50 ms

步骤三、MPLS LDP配置

在各MPLS路由器上配置全局MPLS和LDP

###AR1 
sys
mpls lsr-id 2.2.2.2
mpls
mpls ldp

###AR2
sys
mpls lsr-id 3.3.3.3
mpls
mpls ldp

###AR3
sys
mpls lsr-id 4.4.4.4
mpls
mpls ldp

在各MPLS路由器接口上配置MPLS和LDP

###AR1 
sys
int s1/0/0 
mpls
mpls ldp

###AR2 
sys
int s1/0/0
mpls
mpls ldp
int s2/0/0
mpls
mpls ldp

###AR3 
sys
int s2/0/0
mpls 
mpls ldp

配置完成后在节点上执行display mpls ldp session
命令，可以看到R1和R2 R3之间的本地LDP会话状态为“operational"

AR1]dis mpls ldp session

LDP Session(s) in Public Network
Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
A '*' before a session means the session is being deleted.
------------------------------------------------------------------------------
PeerID Status LAM SsnRole SsnAge KASent/Rcv
------------------------------------------------------------------------------
3.3.3.3:0 Operational DU Passive 0000:00:03 15/15
------------------------------------------------------------------------------
TOTAL: 1 session(s) Found.

[AR2-Serial2/0/0]dis mpls ldp session

LDP Session(s) in Public Network
Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
A '*' before a session means the session is being deleted.
------------------------------------------------------------------------------
PeerID Status LAM SsnRole SsnAge KASent/Rcv
------------------------------------------------------------------------------
2.2.2.2:0 Operational DU Active 0000:00:01 6/6
4.4.4.4:0 Operational DU Passive 0000:00:01 5/5
------------------------------------------------------------------------------
TOTAL: 2 session(s) Found.

[AR2-Serial2/0/0]dis mpls ldp session

LDP Session(s) in Public Network
Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
A '*' before a session means the session is being deleted.
------------------------------------------------------------------------------
PeerID Status LAM SsnRole SsnAge KASent/Rcv
------------------------------------------------------------------------------
2.2.2.2:0 Operational DU Active 0000:00:04 17/17
4.4.4.4:0 Operational DU Passive 0000:00:03 16/16
------------------------------------------------------------------------------
TOTAL: 2 session(s) Found.

[AR3]display mpls ldp session

LDP Session(s) in Public Network
Codes: LAM(Label Advertisement Mode), SsnAge Unit(DDDD:HH:MM)
A '*' before a session means the session is being deleted.
------------------------------------------------------------------------------
PeerID Status LAM SsnRole SsnAge KASent/Rcv
------------------------------------------------------------------------------
3.3.3.3:0 Operational DU Active 0000:00:04 17/17
------------------------------------------------------------------------------
TOTAL: 1 session(s) Found.

步骤四、LDP建立LSP

在配置完成后，各MPLS路由器已经根据默认的LDP触发策略建立LSP。即所有主机路由触发
建立 LDP LSP

在各MPLS路由器上执行display mpls ldp lsp命令，可以看到所有主机路由都触发建立了
LDP LSP

[AR1]dis mpls ldp lsp 

LDP LSP Information
-------------------------------------------------------------------------------
DestAddress/Mask In/OutLabel UpstreamPeer NextHop OutInterface
-------------------------------------------------------------------------------

2.2.2.2/32 3/NULL 3.3.3.3 127.0.0.1 InLoop0
*2.2.2.2/32 Liberal/1024 DS/3.3.3.3
3.3.3.3/32 NULL/3 - 10.0.12.2 S1/0/0
3.3.3.3/32 1024/3 3.3.3.3 10.0.12.2 S1/0/0
4.4.4.4/32 NULL/1025 - 10.0.12.2 S1/0/0
4.4.4.4/32 1025/1025 3.3.3.3 10.0.12.2 S1/0/0
-------------------------------------------------------------------------------
TOTAL: 5 Normal LSP(s) Found.
TOTAL: 1 Liberal LSP(s) Found.
TOTAL: 0 Frr LSP(s) Found.
A '*' before an LSP means the LSP is not established
A '*' before a Label means the USCB or DSCB is stale
A '*' before a UpstreamPeer means the session is stale
A '*' before a DS means the session is stale
A '*' before a NextHop means the LSP is FRR LSP


[AR2]dis mpls ldp lsp 

LDP LSP Information
-------------------------------------------------------------------------------
DestAddress/Mask In/OutLabel UpstreamPeer NextHop OutInterface
-------------------------------------------------------------------------------

2.2.2.2/32 NULL/3 - 10.0.12.1 S1/0/0
2.2.2.2/32 1024/3 2.2.2.2 10.0.12.1 S1/0/0
2.2.2.2/32 1024/3 4.4.4.4 10.0.12.1 S1/0/0
*2.2.2.2/32 Liberal/1024 DS/4.4.4.4
3.3.3.3/32 3/NULL 2.2.2.2 127.0.0.1 InLoop0
3.3.3.3/32 3/NULL 4.4.4.4 127.0.0.1 InLoop0
*3.3.3.3/32 Liberal/1024 DS/2.2.2.2
*3.3.3.3/32 Liberal/1025 DS/4.4.4.4
4.4.4.4/32 NULL/3 - 10.0.23.3 S2/0/0
4.4.4.4/32 1025/3 2.2.2.2 10.0.23.3 S2/0/0
4.4.4.4/32 1025/3 4.4.4.4 10.0.23.3 S2/0/0
*4.4.4.4/32 Liberal/1025 DS/2.2.2.2
-------------------------------------------------------------------------------
TOTAL: 8 Normal LSP(s) Found.
TOTAL: 4 Liberal LSP(s) Found.
TOTAL: 0 Frr LSP(s) Found.
A '*' before an LSP means the LSP is not established
A '*' before a Label means the USCB or DSCB is stale
A '*' before a UpstreamPeer means the session is stale
A '*' before a DS means the session is stale
A '*' before a NextHop means the LSP is FRR LSP

[AR3]dis mpls ldp lsp 

LDP LSP Information
-------------------------------------------------------------------------------
DestAddress/Mask In/OutLabel UpstreamPeer NextHop OutInterface
-------------------------------------------------------------------------------

2.2.2.2/32 NULL/1024 - 10.0.23.2 S2/0/0
2.2.2.2/32 1024/1024 3.3.3.3 10.0.23.2 S2/0/0
3.3.3.3/32 NULL/3 - 10.0.23.2 S2/0/0
3.3.3.3/32 1025/3 3.3.3.3 10.0.23.2 S2/0/0
4.4.4.4/32 3/NULL 3.3.3.3 127.0.0.1 InLoop0
*4.4.4.4/32 Liberal/1025 DS/3.3.3.3
-------------------------------------------------------------------------------
TOTAL: 5 Normal LSP(s) Found.
TOTAL: 1 Liberal LSP(s) Found.
TOTAL: 0 Frr LSP(s) Found.
A '*' before an LSP means the LSP is not established
A '*' before a Label means the USCB or DSCB is stale
A '*' before a UpstreamPeer means the session is stale
A '*' before a DS means the session is stale
A '*' before a NextHop means the LSP is FRR LSP

通常情况下，使用缺省的触发的策略，即由”HOST“方式触发建立 LDP LSP
在各MPLS路由上将LDP LSP的触发策略修改为all，使路由表中的所有静态路由和IGP表项
都可以触发建立LDP LSP。

##R1

sys
mpls
lsp-trigger all

##R2
sys
mpls
lsp-trigger all

##R3

sys
mpls
lsp-trigger all

s配置完成后，在各节点上执行display mpls ldp lsp 命令。可以看到ldp lsp的建立情况

[AR1]dis mpls ldp lsp 

LDP LSP Information
-------------------------------------------------------------------------------
DestAddress/Mask In/OutLabel UpstreamPeer NextHop OutInterface
-------------------------------------------------------------------------------

2.2.2.0/24 3/NULL 3.3.3.3 2.2.2.2 Loop0
2.2.2.2/32 3/NULL 3.3.3.3 127.0.0.1 InLoop0
*2.2.2.2/32 Liberal/1024 DS/3.3.3.3
*3.3.3.0/24 Liberal/3 DS/3.3.3.3
3.3.3.3/32 NULL/3 - 10.0.12.2 S1/0/0
3.3.3.3/32 1024/3 3.3.3.3 10.0.12.2 S1/0/0
4.4.4.4/32 NULL/1025 - 10.0.12.2 S1/0/0
4.4.4.4/32 1025/1025 3.3.3.3 10.0.12.2 S1/0/0
10.0.1.0/24 3/NULL 3.3.3.3 10.0.1.1 GE0/0/1
*10.0.1.0/24 Liberal/1026 DS/3.3.3.3
10.0.2.0/24 NULL/1027 - 10.0.12.2 S1/0/0
10.0.2.0/24 1027/1027 3.3.3.3 10.0.12.2 S1/0/0
10.0.12.0/24 3/NULL 3.3.3.3 10.0.12.1 S1/0/0
*10.0.12.0/24 Liberal/3 DS/3.3.3.3
10.0.23.0/24 NULL/3 - 10.0.12.2 S1/0/0
10.0.23.0/24 1026/3 3.3.3.3 10.0.12.2 S1/0/0
-------------------------------------------------------------------------------
TOTAL: 12 Normal LSP(s) Found.
TOTAL: 4 Liberal LSP(s) Found.
TOTAL: 0 Frr LSP(s) Found.
A '*' before an LSP means the LSP is not established
A '*' before a Label means the USCB or DSCB is stale
A '*' before a UpstreamPeer means the session is stale
A '*' before a DS means the session is stale
A '*' before a NextHop means the LSP is FRR LSP

[AR2]dis mpls ldp lsp 

LDP LSP Information
-------------------------------------------------------------------------------
DestAddress/Mask In/OutLabel UpstreamPeer NextHop OutInterface
-------------------------------------------------------------------------------

*2.2.2.0/24 Liberal/3 DS/2.2.2.2
2.2.2.2/32 NULL/3 - 10.0.12.1 S1/0/0
2.2.2.2/32 1024/3 2.2.2.2 10.0.12.1 S1/0/0
2.2.2.2/32 1024/3 4.4.4.4 10.0.12.1 S1/0/0
*2.2.2.2/32 Liberal/1024 DS/4.4.4.4
3.3.3.0/24 3/NULL 2.2.2.2 3.3.3.3 Loop0
3.3.3.0/24 3/NULL 4.4.4.4 3.3.3.3 Loop0
3.3.3.3/32 3/NULL 2.2.2.2 127.0.0.1 InLoop0
3.3.3.3/32 3/NULL 4.4.4.4 127.0.0.1 InLoop0
*3.3.3.3/32 Liberal/1024 DS/2.2.2.2
*3.3.3.3/32 Liberal/1025 DS/4.4.4.4
*4.4.4.0/24 Liberal/3 DS/4.4.4.4
4.4.4.4/32 NULL/3 - 10.0.23.3 S2/0/0
4.4.4.4/32 1025/3 2.2.2.2 10.0.23.3 S2/0/0
4.4.4.4/32 1025/3 4.4.4.4 10.0.23.3 S2/0/0
*4.4.4.4/32 Liberal/1025 DS/2.2.2.2
10.0.1.0/24 NULL/3 - 10.0.12.1 S1/0/0
10.0.1.0/24 1026/3 2.2.2.2 10.0.12.1 S1/0/0
10.0.1.0/24 1026/3 4.4.4.4 10.0.12.1 S1/0/0
*10.0.1.0/24 Liberal/1026 DS/4.4.4.4
10.0.2.0/24 NULL/3 - 10.0.23.3 S2/0/0
10.0.2.0/24 1027/3 2.2.2.2 10.0.23.3 S2/0/0
10.0.2.0/24 1027/3 4.4.4.4 10.0.23.3 S2/0/0
*10.0.2.0/24 Liberal/1027 DS/2.2.2.2
10.0.12.0/24 3/NULL 2.2.2.2 10.0.12.2 S1/0/0
10.0.12.0/24 3/NULL 4.4.4.4 10.0.12.2 S1/0/0
*10.0.12.0/24 Liberal/3 DS/2.2.2.2
*10.0.12.0/24 Liberal/1027 DS/4.4.4.4
10.0.23.0/24 3/NULL 2.2.2.2 10.0.23.2 S2/0/0
10.0.23.0/24 3/NULL 4.4.4.4 10.0.23.2 S2/0/0
*10.0.23.0/24 Liberal/1026 DS/2.2.2.2
*10.0.23.0/24 Liberal/3 DS/4.4.4.4
-------------------------------------------------------------------------------
TOTAL: 20 Normal LSP(s) Found.
TOTAL: 12 Liberal LSP(s) Found.
TOTAL: 0 Frr LSP(s) Found.
A '*' before an LSP means the LSP is not established
A '*' before a Label means the USCB or DSCB is stale
A '*' before a UpstreamPeer means the session is stale
A '*' before a DS means the session is stale
A '*' before a NextHop means the LSP is FRR LSP

步骤五、LDP inbound策略配置

R1性能较低如果不对R1收到的标签进行控制，则会建立大量的LSP。
消耗大量内存，R1无法承受
配置LDP inbound策略,R1只接收R2标签映射消息，使R1只建立到R2的LSP,从而减少资源的浪费

在R1上配置inbound策略只允许到R2的路由通过

##R1

sys
ip ip-prefix prefix1 permit 10.0.12.0 24
mpls ldp
inbound peer 3.3.3.3 fec ip-prefix prefix1
quit
dis mpls lsp

<AR1>sys
Enter system view, return user view with Ctrl+Z.
[AR1]
[AR1]ip ip-prefix prefix1 permit 10.0.12.0 24
[AR1]
[AR1]mpls ldp
[AR1-mpls-ldp]
[AR1-mpls-ldp]inbound peer 3.3.3.3 fec ip-prefix prefix1
[AR1-mpls-ldp]
[AR1-mpls-ldp]quit
[AR1]
[AR1]dis mpls lsp
-------------------------------------------------------------------------------
LSP Information: LDP LSP
-------------------------------------------------------------------------------
FEC In/Out Label In/Out IF Vrf Name
2.2.2.2/32 3/NULL -/-
10.0.1.0/24 3/NULL -/-
10.0.12.0/24 3/NULL -/-
2.2.2.0/24 3/NULL -/-

posted @ 2018-03-07 21:32 JUSTZHI 阅读(4815) 评论(0) 编辑收藏举报

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实验 MPLS LDP配置