Huawei equipment is configured with CE dual attribution

1. stay MPLS Backbone network configuration IGP agreement , Realize backbone network PE and P Interworking of
   [PE1-LoopBack1]ip add 1.1.1.1 32
   [PE1-GigabitEthernet0/0/0]ip add 20.1.1.1 24
   [PE1]isis 1
   [PE1-isis-1]network-entity 10.0000.0000.0001.00
   [PE1-LoopBack1]isis enable 1
   [PE1-GigabitEthernet0/0/0]isis enable 1
   [P1-LoopBack1]ip add 2.2.2.2 32
   [P1-GigabitEthernet0/0/0]ip add 20.1.1.2 24
   [P1-GigabitEthernet0/0/1]ip add 30.1.1.2 24
   [P1]isis 1
   [P1-isis-1]network-entity 10.0000.0000.0002.00
   [P1-LoopBack1]isis enable 1
   [P1-GigabitEthernet0/0/0]isis enable 1
   [P1-GigabitEthernet0/0/1]isis enable 1
   [PE3-LoopBack1]ip add 3.3.3.3 32
   [PE3-GigabitEthernet0/0/0]ip add 30.1.1.3 24
   [PE3]isis 1
   [PE3-isis-1]network-entity 10.0000.0000.0003.00
   [PE3-LoopBack1]isis enable 1
   [PE3-GigabitEthernet0/0/0]isis enable 1
   [PE2-LoopBack1]ip add 4.4.4.4 32
   [PE2-GigabitEthernet0/0/0]ip add 40.1.1.4 24
   [PE2]isis 1
   [PE2-isis-1]network-entity 10.0000.0000.0004.00
   [PE2-LoopBack1]isis enable 1
   [PE2-GigabitEthernet0/0/0]isis enable 1
   [P2-LoopBack1]ip add 5.5.5.5 32
   [P2-GigabitEthernet0/0/0]ip add 40.1.1.5 24
   [P2-GigabitEthernet0/0/1]ip add 50.1.1.5 24
   [P2]isis 1
   [P2-isis-1]network-entity 10.0000.0000.0005.00
   [P2-LoopBack1]isis enable 1
   [P2-GigabitEthernet0/0/0]isis enable 1
   [P2-GigabitEthernet0/0/1]isis enable 1
   [PE4-LoopBack1]ip add 6.6.6.6 32
   [PE4-GigabitEthernet0/0/0]ip add 50.1.1.6 24
   [PE4]isis 1
   [PE4-isis-1]network-entity 10.0000.0000.0006.00
   [PE4-LoopBack1]isis enable 1
   [PE4-GigabitEthernet0/0/0]isis enable 1

2. stay MPLS Backbone network configuration MPLS Basic abilities and MPLS LDP, establish LDP LSP
   [PE1]mpls lsr-id 1.1.1.1
   [PE1]mpls
   [PE1]mpls ldp
   [PE1-GigabitEthernet0/0/0]mpls
   [PE1-GigabitEthernet0/0/0]mpls ldp
   [P1]mpls lsr-id 2.2.2.2
   [P1]mpls
   [P1]mpls ldp
   [P1-GigabitEthernet0/0/0]mpls
   [P1-GigabitEthernet0/0/0]mpls ldp
   [P1-GigabitEthernet0/0/1]mpls
   [P1-GigabitEthernet0/0/1]mpls ldp
   [PE3]mpls lsr-id 3.3.3.3
   [PE3]mpls
   [PE3]mpls ldp
   [PE3-GigabitEthernet0/0/0]mpls
   [PE3-GigabitEthernet0/0/0]mpls ldp
   [PE2]mpls lsr-id 4.4.4.4
   [PE2]mpls
   [PE2]mpls ldp
   [PE2-GigabitEthernet0/0/0]mpls
   [PE2-GigabitEthernet0/0/0]mpls ldp
   [P2]mpls lsr-id 5.5.5.5
   [P2]mpls
   [P2]mpls ldp
   [P2-GigabitEthernet0/0/0]mpls
   [P2-GigabitEthernet0/0/0]mpls ldp
   [P2-GigabitEthernet0/0/1]mpls
   [P2-GigabitEthernet0/0/1]mpls ldp
   [PE4]mpls lsr-id 6.6.6.6
   [PE4]mpls
   [PE4]mpls ldp
   [PE4-GigabitEthernet0/0/0]mpls
   [PE4-GigabitEthernet0/0/0]mpls ldp
   
   

3. stay PE The device is configured with VPN example , take CE Access PE
   [PE1]ip vpn-instance vpn1
   [PE1-vpn-instance-vpn1]ipv4-family
   [PE1-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:1
   [PE1-vpn-instance-vpn1-af-ipv4]vpn-target 1:1
   [PE1-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
   [PE1-GigabitEthernet0/0/1]ip add 10.1.1.1 24
   [PE3]ip vpn-instance vpn1
   [PE3-vpn-instance-vpn1]ipv4-family
   [PE3-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:3
   [PE3-vpn-instance-vpn1-af-ipv4]vpn-target 1:1
   [PE3-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
   [PE3-GigabitEthernet0/0/1]ip add 10.3.1.3 24
   [PE2]ip vpn-instance vpn1
   [PE2-vpn-instance-vpn1]ipv4-family
   [PE2-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:2
   [PE2-vpn-instance-vpn1-af-ipv4]vpn-target 1:1
   [PE2-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
   [PE2-GigabitEthernet0/0/1]ip add 10.2.1.4 24
   [PE4]ip vpn-instance vpn1
   [PE4-vpn-instance-vpn1]ipv4-family
   [PE4-vpn-instance-vpn1-af-ipv4]route-distinguisher 100:4
   [PE4-vpn-instance-vpn1-af-ipv4]vpn-target 1:1
   [PE4-GigabitEthernet0/0/1]ip binding vpn-instance vpn1
   [PE4-GigabitEthernet0/0/1]ip add 10.4.1.6 24

4. stay PE Establish between MP-IBGP Peer relationship
   [PE1]bgp 100
   [PE1-bgp]peer 3.3.3.3 as-number 100
   [PE1-bgp]peer 3.3.3.3 connect-interface LoopBack 1
   [PE1-bgp]ipv4-family vpnv4
   [PE1-bgp-af-vpnv4]peer 3.3.3.3 enable
   [PE3]bgp 100
   [PE3-bgp]peer 1.1.1.1 as-number 100
   [PE3-bgp]peer 1.1.1.1 connect-interface LoopBack 1
   [PE3-bgp]ipv4-family vpnv4
   [PE3-bgp-af-vpnv4]peer 1.1.1.1 enable
   [PE2]bgp 100
   [PE2-bgp]peer 6.6.6.6 as-number 100
   [PE2-bgp]peer 6.6.6.6 connect-interface LoopBack 1
   [PE2-bgp]ipv4-family vpnv4
   [PE2-bgp-af-vpnv4]peer 6.6.6.6 enable
   [PE4]bgp 100
   [PE4-bgp]peer 4.4.4.4 as-number 100
   [PE4-bgp]peer 4.4.4.4 connect-interface LoopBack 1
   [PE4-bgp]ipv4-family vpnv4
   [PE4-bgp-af-vpnv4]peer 4.4.4.4 enable
   
   

5. stay PE And CE Configuration between EBGP Routing protocol , introduce VPN route
   [CE1-GigabitEthernet0/0/0]ip add 10.1.1.7 24
   [CE1-GigabitEthernet0/0/1]ip add 10.2.1.7 24
   [CE1-GigabitEthernet0/0/2]ip ad 1.5.1.7 24
   [CE1]bgp 65410
   [CE1-bgp]peer 10.1.1.1 as-number 100
   [CE1-bgp]peer 10.2.1.4 as-number 100
   [CE1-bgp]import-route direct
   [CE2-GigabitEthernet0/0/0]ip add 10.3.1.8 24
   [CE2-GigabitEthernet0/0/1]ip add 10.4.1.8 24
   [CE2-GigabitEthernet0/0/2]ip add 1.6.1.8 24
   [CE2]bgp 65420
   [CE2-bgp]peer 10.3.1.3 as-number 100
   [CE2-bgp]peer 10.4.1.6 as-number 100
   [CE2-bgp]import-route direct
   [PE1]bgp 100
   [PE1-bgp]ipv4-family vpn-instance vpn1
   [PE1-bgp-vpn1]peer 10.1.1.7 as-number 65410
   [PE1-bgp-vpn1]import-route direct
   [PE2]bgp 100
   [PE2-bgp]ipv4-family vpn-instance vpn1
   [PE2-bgp-vpn1]peer 10.2.1.7 as-number 65410
   [PE2-bgp-vpn1]import-route direct
   PE3]bgp 100
   [PE3-bgp]ipv4-family vpn-instance vpn1
   [PE3-bgp-vpn1]peer 10.3.1.8 as-number 65420
   [PE3-bgp-vpn1]import-route direct
   [PE4]bgp 100
   [PE4-bgp]ipv4-family vpn-instance vpn1
   [PE4-bgp-vpn1]peer 10.4.1.8 as-number 65420
   [PE4-bgp-vpn1]import-route direct
   

6. stay CE1 Configuration on allows CE1 To CE2 The traffic allows load sharing
   [CE1]bgp 65410
   [CE1-bgp]ipv4-family unicast
   [CE1-bgp-af-ipv4]maximum load-balancing 2

7. Configure routing policies , increase PE3 Publish to CE2 Of BGP The routing MED value , send CE2 To CE1 Of flow through PE4,PE3 As backup
   [PE3]route-policy p1 permit node 10
   [PE3-route-policy]apply cost 120
   [PE3]bgp 100
   [PE3-bgp]ipv4-family vpn-instance vpn1
   [PE3-bgp-vpn1]peer 10.3.1.8 route-policy p1 export
   

Find that for 1.5.1.0/30 The routing ,PE3 released MED The value is 120, Than PE4 released MED Large value （ By default MED The value of is 0）, So choose PE4 released
8. Check the configuration

See go to the opposite end CE2 The route of the connected user , And load sharing

Go to the opposite end CE1 The route of the connected user , And the next jump is 10.4.1.6（PE4 Access on CE2 The interface of IP Address ）