Technical documentation
发布日期:2023-06-19 浏览次数:1455 来源:WOLFLAB
HCIE Datacom培训考试学习-SR(Segment Routing)-MPLS L3 VPN
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实验:实现192.168.1.0/24能够访问192.168.2.0/24
第一步:完成AS123的SR-MPLS BE的搭建
第二步:配置CX1和CX3的BGP VPNV4的邻居关系
[CX1-bgp]dis this
#
bgp 123
undo default ipv4-unicast
peer 3.3.3.3 as-number 123
peer 3.3.3.3 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
undo peer 3.3.3.3 enable
#
ipv4-family vpnv4
policy vpn-target
peer 3.3.3.3 enable
[CE3-bgp]dis this
#
bgp 123
undo default ipv4-unicast
peer 1.1.1.1 as-number 123
peer 1.1.1.1 connect-interface LoopBack0
#
ipv4-family unicast
undo synchronization
undo peer 1.1.1.1 enable
#
ipv4-family vpnv4
policy vpn-target
peer 1.1.1.1 enable
第三步:配置PE和CE的接入协议
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第一步:AR1发送,数据包到了CX1的VRF A1中
icmp request:
sip:192.168.1.1 dip:192.168.2.1
第二步:CX1查看目的网段路由的详细信息
[CX1]dis ip routing-table vpn-instance A1 192.168.2.0 verbose
Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole
route
--------------------------------------
Routing Table : A1
Summary Count : 1
Destination: 192.168.2.0/24
Protocol: IBGP Process ID: 0
Preference: 255 Cost: 0
NextHop: 3.3.3.3 Neighbour: 3.3.3.3
State: Active Adv Relied Age: 00h01m15s
Tag: 0 Priority: low
Label: 48120 QoSInfo: 0x0
IndirectID: 0x100007E Instance:
RelayNextHop: 1.1.12.2 Interface: Ethernet1/0/0
TunnelID: 0x000000002900000083 Flags: RD
[CX1]dis tunnel-info all
Tunnel ID Type Destination
Status
-------------------------------------
0x000000002900000082 srbe-lsp 2.2.2.2
UP
0x000000002900000083 srbe-lsp 3.3.3.3
[CX1]dis 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
------------------------------------
1.1.1.1/32 16001 NULL Loop0 127.0.0.1 E
--- 1500 Active
2.2.2.2/32 16002 3 Eth1/0/0 1.1.12.2 I&T
--- 1500 Active
3.3.3.3/32 16003 17003 Eth1/0/0 1.1.12.2 I&T
--- 1500 Active
CX1为该数据包打上私网标签,和SR-MPLS BE 分配的公网标签:
注意:CX1查看该路由的详细信息的TunnelID跟隧道的TunnelID是一样的,表示我使用哪个隧道
icmp request:
sip:192.168.1.1 dip:192.168.2.1 | MP-BGP:48120 | SR-MPLS BE:17003
第三步:CX2根据标签转发信息表转发报文
[CX2]dis 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
-----------------------------------
1.1.1.1/32 17001 3 Eth1/0/0 1.1.12.1 I&T
--- 1500 Active
2.2.2.2/32 17002 NULL Loop0 127.0.0.1 E
--- 1500 Active
3.3.3.3/32 17003 3 Eth1/0/1 1.1.23.3 I&T
--- 1500 Active
第四步:CX3根据携带的私网标签查找对应的VRF进行报文的转发
[CX3]dis mpls lsp
---------------------------------
LSP Information: BGP LSP
---------------------------------
FEC In/Out Label In/Out IF Vrf Name
192.168.2.0/24 48120/NULL -/- A2
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