Example for Configuring DSCP-based Path Detection on a VXLAN Network

This section uses an IPv4 NFVI distributed gateway as an example to describe how to implement DSCP-based path detection on a VXLAN network.

Context

Networking Requirements

The NFVI telco cloud solution is based on Data Center Interconnect (DCI)+Data Center Network (DCN) networking, as shown in Figure 1.

DCGWs are the DCN's border gateways and can exchange Internet routes with the external network.
L2GW/L3GW1 and L2GW/L3GW2 access the virtualized network functions (VNFs).
VNF1 and VNF2 can be deployed as virtualized NEs to implement the vUGW and vMSE functions and connect to L2GW/L3GW1 and L2GW/L3GW2 through the interface processing unit (IPU).

Assume that the detected path is DCGW2->L2GW/L3GW2->VNF2. DSCP-based IPv4 path detection is enabled on all devices along the path, and a detection packet is constructed and forwarded on the ingress DCGW2.

Generally, the NetEngine 8000 F is generally used as the DCGW for path detection.

Figure 1 Configuring DSCP-based path detection in IPv4 NFVI distributed gateway networking

Interfaces 1 through 4 in this example represent GE 0/1/1, GE 0/1/2, GE 0/1/3, GE 0/1/4, GE 0/1/5, respectively.

**Table 1** IP addresses of interfaces
Device Name	Interface	IP Address
DCGW1	GigabitEthernet 0/1/1	10.6.1.1/24
	GigabitEthernet 0/1/2	10.6.2.1/24
	LoopBack0	9.9.9.9/32
	LoopBack1	3.3.3.3/32
	LoopBack2	33.33.33.33/32
DCGW2	GigabitEthernet 0/1/1	10.6.1.2/24
	GigabitEthernet 0/1/2	10.6.3.1/24
	LoopBack0	9.9.9.9/32
	LoopBack1	4.4.4.4/32
	LoopBack2	44.44.44.44/32
L2GW/L3GW1	GigabitEthernet 0/1/1	10.6.4.1/24
	GigabitEthernet 0/1/2	10.6.2.2/24
	GigabitEthernet 0/1/3	-
	GigabitEthernet 0/1/4	-
	GigabitEthernet 0/1/5	-
	LoopBack1	1.1.1.1/32
L2GW/L3GW2	GigabitEthernet 0/1/1	10.6.4.2/24
	GigabitEthernet 0/1/2	10.6.3.2/24
	GigabitEthernet 0/1/3	-
	GigabitEthernet 0/1/4	-
	LoopBack1	2.2.2.2/32

Configuration Roadmap

The configuration roadmap is as follows:

Assign an IP address to each device interface, including the loopback interfaces.
Configure a routing protocol on each DCGW and each L2GW/L3GW to ensure Layer 3 communication. OSPF is used in this example.
Configure IPv4 NFVI distributed gateway networking on the DCGWs and L2GW/L3GW.
Configure DSCP-based IPv4 path detection on DCGW2 and L2GW/L3GW2.
Configure DCGW2 to construct and forward an IPv4 detection packet.

Before the configuration, ensure that a NETCONF connection has been established between the controller and device.

Procedure

Assign an IP address to each device interface, including the loopback interfaces.
For configuration details, see Configuration Files.
Configure a routing protocol on each DCGW and each L2GW/L3GW to ensure Layer 3 communication. OSPF is used in this example.
For configuration details, see Configuration Files.
Configure IPv4 NFVI distributed gateway networking on the DCGW and L2GW/L3GW.
For the configuration roadmap, see VXLAN Configuration. For configuration details, see Configuration Files.
Configure DSCP-based IPv4 path detection on DCGW2 and L2GW/L3GW2.
# Configure DCGW2.
```
[~DCGW2] ip path detection enable dscp 3
```
# Configure L2GW/L3GW2.
```
[~L2GW/L3GW2] ip path detection enable dscp 3
```

Configure DCGW2 to construct and forward an IPv4 detection packet.

[*DCGW2] ip path detection send-packet src-mac 00e0-fc12-3456 dst-mac 00e0-fc12-7890 src-ip 10.1.1.1 dst-ip 10.2.2.2 protocol udp src-port 1000 dst-port 2000 dscp 3 vpn-instance vpn1 interface GigabitEthernet0/1/1 testid 2

Configuration Files

DCGW1 configuration file

#
sysname DCGW1
#
evpn
 bypass-vxlan enable
#
evpn vpn-instance evrf1 bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
evpn vpn-instance evrf2 bd-mode
 route-distinguisher 2:2
 vpn-target 2:2 export-extcommunity
 vpn-target 2:2 import-extcommunity
#
evpn vpn-instance evrf3 bd-mode
 route-distinguisher 3:3
 vpn-target 3:3 export-extcommunity
 vpn-target 3:3 import-extcommunity
#
evpn vpn-instance evrf4 bd-mode
 route-distinguisher 4:4
 vpn-target 4:4 export-extcommunity
 vpn-target 4:4 import-extcommunity
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 11:11
  apply-label per-instance
  export route-policy dp evpn
  vpn-target 11:1 export-extcommunity evpn
  vpn-target 11:1 import-extcommunity evpn
 vxlan vni 200  
#
bridge-domain 10
 vxlan vni 100 split-horizon-mode
 evpn binding vpn-instance evrf1
#
bridge-domain 20
 vxlan vni 110 split-horizon-mode
 evpn binding vpn-instance evrf2
#
bridge-domain 30
 vxlan vni 120 split-horizon-mode
 evpn binding vpn-instance evrf3
#
bridge-domain 40
 vxlan vni 130 split-horizon-mode
 evpn binding vpn-instance evrf4
#
interface Vbdif10
 ip binding vpn-instance vpn1
 ip address 10.1.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0002
 vxlan anycast-gateway enable
#
interface Vbdif20
 ip binding vpn-instance vpn1
 ip address 10.2.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0003
 vxlan anycast-gateway enable
#
interface Vbdif30
 ip binding vpn-instance vpn1
 ip address 10.3.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0001
 vxlan anycast-gateway enable
#
interface Vbdif40
 ip binding vpn-instance vpn1
 ip address 10.4.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0004
 vxlan anycast-gateway enable
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 10.6.1.1 255.255.255.0
#
interface GigabitEthernet0/1/2
 undo shutdown
 ip address 10.6.2.1 255.255.255.0
#
interface LoopBack0
 ip address 9.9.9.9 255.255.255.255
#
interface LoopBack1
 ip address 3.3.3.3 255.255.255.255
#
interface LoopBack2
 ip binding vpn-instance vpn1
 ip address 33.33.33.33 255.255.255.255
#
interface Nve1
 source 9.9.9.9
 bypass source 3.3.3.3
 mac-address 00e0-fc00-0009
 vni 100 head-end peer-list protocol bgp
 vni 110 head-end peer-list protocol bgp
 vni 120 head-end peer-list protocol bgp
 vni 130 head-end peer-list protocol bgp
#
bgp 100
 peer 1.1.1.1 as-number 100
 peer 1.1.1.1 connect-interface LoopBack1
 peer 2.2.2.2 as-number 100
 peer 2.2.2.2 connect-interface LoopBack1
 peer 4.4.4.4 as-number 100
 peer 4.4.4.4 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.1 enable
  peer 2.2.2.2 enable
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance vpn1
  network 0.0.0.0 0
  import-route direct
  maximum load-balancing 16  
  advertise l2vpn evpn
  peer 5.5.5.5 as-number 100
  peer 5.5.5.5 connect-interface LoopBack2
  peer 5.5.5.5 route-policy p1 export
  peer 6.6.6.6 as-number 100
  peer 6.6.6.6 connect-interface LoopBack2
  peer 6.6.6.6 route-policy p1 export
 #
 l2vpn-family evpn
  undo policy vpn-target
  peer 1.1.1.1 enable
  peer 1.1.1.1 capability-advertise add-path both
  peer 1.1.1.1 advertise add-path path-number 16
  peer 1.1.1.1 advertise encap-type vxlan
  peer 2.2.2.2 enable
  peer 2.2.2.2 capability-advertise add-path both
  peer 2.2.2.2 advertise add-path path-number 16
  peer 2.2.2.2 advertise encap-type vxlan
  peer 4.4.4.4 enable
  peer 4.4.4.4 advertise encap-type vxlan
  peer 4.4.4.4 route-policy stopuIP export
#
ospf 1
 area 0.0.0.0
  network 3.3.3.3 0.0.0.0
  network 9.9.9.9 0.0.0.0
  network 10.6.1.0 0.0.0.255
  network 10.6.2.0 0.0.0.255
#
route-policy dp permit node 10
 if-match tag 2000
#
route-policy dp permit node 15
 if-match ip-prefix lp
#
route-policy dp deny node 20
#
route-policy p1 deny node 10
#
route-policy stopuIP deny node 10
 if-match ip-prefix uIP
#
route-policy stopuIP permit node 20
#
ip ip-prefix lp index 10 permit 33.33.33.33 32
ip ip-prefix uIP index 10 permit 10.10.10.10 32
#
ip route-static vpn-instance vpn1 0.0.0.0 0.0.0.0 NULL0 tag 2000
#
return

DCGW2 configuration file

#
sysname DCGW2
#
evpn
 bypass-vxlan enable
#
evpn vpn-instance evrf1 bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
evpn vpn-instance evrf2 bd-mode
 route-distinguisher 2:2
 vpn-target 2:2 export-extcommunity
 vpn-target 2:2 import-extcommunity
#
evpn vpn-instance evrf3 bd-mode
 route-distinguisher 3:3
 vpn-target 3:3 export-extcommunity
 vpn-target 3:3 import-extcommunity
#
evpn vpn-instance evrf4 bd-mode
 route-distinguisher 4:4
 vpn-target 4:4 export-extcommunity
 vpn-target 4:4 import-extcommunity
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 11:11
  apply-label per-instance
  export route-policy dp evpn
  vpn-target 11:1 export-extcommunity evpn
  vpn-target 11:1 import-extcommunity evpn
 vxlan vni 200  
#
bridge-domain 10
 vxlan vni 100 split-horizon-mode
 evpn binding vpn-instance evrf1
#
bridge-domain 20
 vxlan vni 110 split-horizon-mode
 evpn binding vpn-instance evrf2
#
bridge-domain 30
 vxlan vni 120 split-horizon-mode
 evpn binding vpn-instance evrf3
#
bridge-domain 40
 vxlan vni 130 split-horizon-mode
 evpn binding vpn-instance evrf4
#
interface Vbdif10
 ip binding vpn-instance vpn1
 ip address 10.1.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0002
 vxlan anycast-gateway enable
#
interface Vbdif20
 ip binding vpn-instance vpn1
 ip address 10.2.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0003
 vxlan anycast-gateway enable
#
interface Vbdif30
 ip binding vpn-instance vpn1
 ip address 10.3.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0001
 vxlan anycast-gateway enable
#
interface Vbdif40
 ip binding vpn-instance vpn1
 ip address 10.4.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0004
 vxlan anycast-gateway enable
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 10.6.1.2 255.255.255.0
#
interface GigabitEthernet0/1/2
 undo shutdown
 ip address 10.6.3.1 255.255.255.0
#
interface LoopBack0
 ip address 9.9.9.9 255.255.255.255
#
interface LoopBack1
 ip address 4.4.4.4 255.255.255.255
#
interface LoopBack2
 ip binding vpn-instance vpn1
 ip address 44.44.44.44 255.255.255.255
#
interface Nve1
 source 9.9.9.9
 bypass source 4.4.4.4
 mac-address 00e0-fc00-0009
 vni 100 head-end peer-list protocol bgp
 vni 110 head-end peer-list protocol bgp
 vni 120 head-end peer-list protocol bgp
 vni 130 head-end peer-list protocol bgp
#
bgp 100
 peer 1.1.1.1 as-number 100
 peer 1.1.1.1 connect-interface LoopBack1
 peer 2.2.2.2 as-number 100
 peer 2.2.2.2 connect-interface LoopBack1
 peer 3.3.3.3 as-number 100
 peer 3.3.3.3 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.1 enable
  peer 2.2.2.2 enable
  peer 3.3.3.3 enable
 #
 ipv4-family vpn-instance vpn1
  network 0.0.0.0 0
  import-route direct
  maximum load-balancing 16  
  advertise l2vpn evpn
  peer 5.5.5.5 as-number 100
  peer 5.5.5.5 connect-interface LoopBack2
  peer 5.5.5.5 route-policy p1 export
  peer 6.6.6.6 as-number 100
  peer 6.6.6.6 connect-interface LoopBack2
  peer 6.6.6.6 route-policy p1 export
 #
 l2vpn-family evpn
  undo policy vpn-target
  peer 1.1.1.1 enable
  peer 1.1.1.1 capability-advertise add-path both
  peer 1.1.1.1 advertise add-path path-number 16
  peer 1.1.1.1 advertise encap-type vxlan
  peer 2.2.2.2 enable
  peer 2.2.2.2 capability-advertise add-path both
  peer 2.2.2.2 advertise add-path path-number 16
  peer 2.2.2.2 advertise encap-type vxlan
  peer 3.3.3.3 enable
  peer 3.3.3.3 advertise encap-type vxlan
  peer 3.3.3.3 route-policy stopuIP export
#
ospf 1
 area 0.0.0.0
  network 4.4.4.4 0.0.0.0
  network 9.9.9.9 0.0.0.0
  network 10.6.1.0 0.0.0.255
  network 10.6.3.0 0.0.0.255
#
route-policy dp permit node 10
 if-match tag 2000
#
route-policy dp permit node 15
 if-match ip-prefix lp
#
route-policy dp deny node 20
#
route-policy p1 deny node 10
#
route-policy stopuIP deny node 10
 if-match ip-prefix uIP
#
route-policy stopuIP permit node 20
#
ip ip-prefix lp index 10 permit 44.44.44.44 32
ip ip-prefix uIP index 10 permit 10.10.10.10 32
#
ip route-static vpn-instance vpn1 0.0.0.0 0.0.0.0 NULL0 tag 2000
#
ip path detection enable dscp 3
#
return

L2GW/L3GW1 configuration file

#
sysname L2GW/L3GW1
#
evpn vpn-instance evrf1 bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
evpn vpn-instance evrf2 bd-mode
 route-distinguisher 2:2
 vpn-target 2:2 export-extcommunity
 vpn-target 2:2 import-extcommunity
#
evpn vpn-instance evrf3 bd-mode
 route-distinguisher 3:3
 vpn-target 3:3 export-extcommunity
 vpn-target 3:3 import-extcommunity
#
evpn vpn-instance evrf4 bd-mode
 route-distinguisher 4:4
 vpn-target 4:4 export-extcommunity
 vpn-target 4:4 import-extcommunity
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 11:11
  apply-label per-instance
  export route-policy sp evpn
  vpn-target 11:1 export-extcommunity evpn
  vpn-target 11:1 import-extcommunity evpn
 vxlan vni 200
#
bridge-domain 10
 vxlan vni 100 split-horizon-mode
 evpn binding vpn-instance evrf1
#
bridge-domain 20
 vxlan vni 110 split-horizon-mode
 evpn binding vpn-instance evrf2
#
bridge-domain 30
 vxlan vni 120 split-horizon-mode
 evpn binding vpn-instance evrf3
#
bridge-domain 40
 vxlan vni 130 split-horizon-mode
 evpn binding vpn-instance evrf4
#
interface Vbdif10
 ip binding vpn-instance vpn1
 ip address 10.1.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0002
 vxlan anycast-gateway enable
 arp collect host enable
#
interface Vbdif20
 ip binding vpn-instance vpn1
 ip address 10.2.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0003
 vxlan anycast-gateway enable
 arp collect host enable
#
interface Vbdif30
 ip binding vpn-instance vpn1
 ip address 10.3.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0001
 vxlan anycast-gateway enable
 arp collect host enable
#
interface Vbdif40
 ip binding vpn-instance vpn1
 ip address 10.4.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0004
 vxlan anycast-gateway enable
 arp collect host enable
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 10.6.4.1 255.255.255.0
#
interface GigabitEthernet0/1/2
 undo shutdown
 ip address 10.6.2.2 255.255.255.0
#
interface GigabitEthernet0/1/3.1 mode l2
 encapsulation dot1q vid 10
 rewrite pop single
 bridge-domain 10
#
interface GigabitEthernet0/1/4.1 mode l2
 encapsulation dot1q vid 20
 rewrite pop single
 bridge-domain 20
#
interface GigabitEthernet0/1/5.1 mode l2
 encapsulation dot1q vid 10
 rewrite pop single
 bridge-domain 10
#
interface LoopBack1
 ip address 1.1.1.1 255.255.255.255
#
interface Nve1
 source 1.1.1.1
 vni 100 head-end peer-list protocol bgp
 vni 110 head-end peer-list protocol bgp
 vni 120 head-end peer-list protocol bgp
 vni 130 head-end peer-list protocol bgp
#
bgp 100
 peer 2.2.2.2 as-number 100
 peer 2.2.2.2 connect-interface LoopBack1
 peer 3.3.3.3 as-number 100
 peer 3.3.3.3 connect-interface LoopBack1
 peer 4.4.4.4 as-number 100
 peer 4.4.4.4 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 2.2.2.2 enable
  peer 3.3.3.3 enable
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance vpn1
  import-route static
  maximum load-balancing 16  
  advertise l2vpn evpn import-route-multipath
 #
 l2vpn-family evpn
  undo policy vpn-target
  bestroute add-path path-number 16
  peer 2.2.2.2 enable
  peer 2.2.2.2 advertise arp
  peer 2.2.2.2 advertise encap-type vxlan
  peer 3.3.3.3 enable
  peer 3.3.3.3 advertise arp
  peer 3.3.3.3 capability-advertise add-path both
  peer 3.3.3.3 advertise add-path path-number 16
  peer 3.3.3.3 advertise encap-type vxlan
  peer 4.4.4.4 enable
  peer 4.4.4.4 advertise arp
  peer 4.4.4.4 capability-advertise add-path both
  peer 4.4.4.4 advertise add-path path-number 16
  peer 4.4.4.4 advertise encap-type vxlan
#
ospf 1
 area 0.0.0.0
  network 1.1.1.1 0.0.0.0
  network 10.6.2.0 0.0.0.255
  network 10.6.4.0 0.0.0.255
#
route-policy sp permit node 10
 if-match tag 1000
 apply gateway-ip origin-nexthop
#
route-policy sp deny node 20
#
ip route-static vpn-instance vpn1 5.5.5.5 255.255.255.255 10.1.1.2 tag 1000
ip route-static vpn-instance vpn1 5.5.5.5 255.255.255.255 10.2.1.2 tag 1000
ip route-static vpn-instance vpn1 6.6.6.6 255.255.255.255 10.1.1.3 tag 1000
#
return

L2GW/L3GW2 configuration file

#
sysname L2GW/L3GW2
#
evpn vpn-instance evrf1 bd-mode
 route-distinguisher 1:1
 vpn-target 1:1 export-extcommunity
 vpn-target 1:1 import-extcommunity
#
evpn vpn-instance evrf2 bd-mode
 route-distinguisher 2:2
 vpn-target 2:2 export-extcommunity
 vpn-target 2:2 import-extcommunity
#
evpn vpn-instance evrf3 bd-mode
 route-distinguisher 3:3
 vpn-target 3:3 export-extcommunity
 vpn-target 3:3 import-extcommunity
#
evpn vpn-instance evrf4 bd-mode
 route-distinguisher 4:4
 vpn-target 4:4 export-extcommunity
 vpn-target 4:4 import-extcommunity
#
ip vpn-instance vpn1
 ipv4-family
  route-distinguisher 11:11
  apply-label per-instance
  export route-policy sp evpn
  vpn-target 11:1 export-extcommunity evpn
  vpn-target 11:1 import-extcommunity evpn
 vxlan vni 200
#
bridge-domain 10
 vxlan vni 100 split-horizon-mode
 evpn binding vpn-instance evrf1
#
bridge-domain 20
 vxlan vni 110 split-horizon-mode
 evpn binding vpn-instance evrf2
#
bridge-domain 30
 vxlan vni 120 split-horizon-mode
 evpn binding vpn-instance evrf3
#
bridge-domain 40
 vxlan vni 130 split-horizon-mode
 evpn binding vpn-instance evrf4
#
interface Vbdif10
 ip binding vpn-instance vpn1
 ip address 10.1.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0002
 vxlan anycast-gateway enable
 arp collect host enable
#
interface Vbdif20
 ip binding vpn-instance vpn1
 ip address 10.2.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0003
 vxlan anycast-gateway enable
 arp collect host enable
#
interface Vbdif30
 ip binding vpn-instance vpn1
 ip address 10.3.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0001
 vxlan anycast-gateway enable
 arp collect host enable
#
interface Vbdif40
 ip binding vpn-instance vpn1
 ip address 10.4.1.1 255.255.255.0
 arp generate-rd-table enable
 mac-address 00e0-fc00-0004
 vxlan anycast-gateway enable
 arp collect host enable
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 10.6.4.2 255.255.255.0
#
interface GigabitEthernet0/1/2
 undo shutdown
 ip address 10.6.3.2 255.255.255.0
#
interface GigabitEthernet0/1/3.1 mode l2
 encapsulation dot1q vid 30
 rewrite pop single
 bridge-domain 30
#
interface GigabitEthernet0/1/4.1 mode l2
 encapsulation dot1q vid 40
 rewrite pop single
 bridge-domain 40
#
interface LoopBack1
 ip address 2.2.2.2 255.255.255.255
#               
interface Nve1
 source 2.2.2.2
 vni 100 head-end peer-list protocol bgp
 vni 110 head-end peer-list protocol bgp
 vni 120 head-end peer-list protocol bgp
 vni 130 head-end peer-list protocol bgp
#
bgp 100
 peer 1.1.1.1 as-number 100
 peer 1.1.1.1 connect-interface LoopBack1
 peer 3.3.3.3 as-number 100
 peer 3.3.3.3 connect-interface LoopBack1
 peer 4.4.4.4 as-number 100
 peer 4.4.4.4 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 1.1.1.1 enable
  peer 3.3.3.3 enable
  peer 4.4.4.4 enable
 #
 ipv4-family vpn-instance vpn1
  import-route static
  maximum load-balancing 16  
  advertise l2vpn evpn import-route-multipath
 #
 l2vpn-family evpn
  undo policy vpn-target
  bestroute add-path path-number 16
  peer 1.1.1.1 enable
  peer 1.1.1.1 advertise arp
  peer 1.1.1.1 advertise encap-type vxlan
  peer 3.3.3.3 enable
  peer 3.3.3.3 advertise arp
  peer 3.3.3.3 capability-advertise add-path both
  peer 3.3.3.3 advertise add-path path-number 16
  peer 3.3.3.3 advertise encap-type vxlan
  peer 4.4.4.4 enable
  peer 4.4.4.4 advertise arp
  peer 4.4.4.4 capability-advertise add-path both
  peer 4.4.4.4 advertise add-path path-number 16
  peer 4.4.4.4 advertise encap-type vxlan
#
ospf 1
 area 0.0.0.0
  network 2.2.2.2 0.0.0.0
  network 10.6.3.0 0.0.0.255
  network 10.6.4.0 0.0.0.255
#
route-policy sp permit node 10
 if-match tag 1000
 apply gateway-ip origin-nexthop
#
route-policy sp deny node 20
#
ip route-static vpn-instance vpn1 6.6.6.6 255.255.255.255 10.3.1.2 tag 1000
ip route-static vpn-instance vpn1 6.6.6.6 255.255.255.255 10.4.1.2 tag 1000
#
ip path detection enable dscp 3
#
return

VNF1 configuration file

For details, see the configuration file of the specific device model.
VNF2 configuration file

For details, see the configuration file of the specific device model.