Example for Configuring MPLS EVPN E-LAN Option B

This section provides an example for configuring inter-AS MPLS EVPN Option B. A single-hop MP-EBGP peer relationship is established between ASBRs to exchange EVPN routes.

Context

Networking Requirements

As shown in Figure 1, CE1 and CE2 belong to the same EVPN. CE1 is connected to PE1 in AS 100, and CE2 is connected to PE2 in AS 200. It is required that an MP-EBGP peer relationship be established between the ASBRs to transmit EVPN routes, implementing inter-AS MPLS EVPN E-LAN Option B.

Figure 1 Configuring MPLS EVPN E-LAN Option B

Interfaces 1 and 2 in this example represent GE 0/1/0 and GE 0/1/8, respectively.

Configuration Notes

When configuring MPLS EVPN E-LAN Option B, note the following:

Configure an MP-EBGP peer relationship between ASBR1 and ASBR2, and disable the ASBRs from filtering received EVPN routes based on RTs.

Configuration Roadmap

The configuration roadmap is as follows:

Configure an IGP on the MPLS backbone network to implement interworking of the ASBRs and PEs in each AS, and establish an MPLS LDP LSP between the ASBRs and PEs in each AS.
Configure the CE access function on the PE and establish an MP-IBGP peer relationship between the PE and ASBR in each AS.
Configure EVPN instances on PEs (no EVPN instance needs to be configured on ASBRs).
Enable MPLS on the ASBR interfaces connected to each other. Establish an MP-EBGP peer relationship between ASBRs and configure ASBRs not to filter VPNv6 routes based on RTs.

Data Preparation

To complete the configuration, you need the following data:

Interface names and IP address
MPLS LSR IDs of the PEs and ASBRs
Names, RDs, and RTs of the EVPN instances of the PEs

Procedure

On the MPLS backbone networks in AS 100 and AS 200, configure an IGP to interconnect the PEs on each network.
In this example, OSPF is used as an IGP. For configuration details, see Configuration Files in this section.

LSR IDs, where are 32-bit IP addresses of loopback interfaces, need to be advertised using OSPF.

After completing the preceding configurations, run the display ospf peer command on the ASBR and PE in each AS. The command output shows that the OSPF neighbor relationship is in the Full state, which indicates that the OSPF neighbor relationship has been established between the ASBR and PE in the same AS.

The ASBR and PE in the same AS can learn the loopback interface address of each other and successfully ping each other.
Configure basic MPLS capabilities and MPLS LDP on the MPLS backbone networks of AS 100 and AS 200 to establish LDP LSPs.
For configuration details, see Configuration Files in this section.
Configure basic EVPN functions on PE1 and PE2.

PE1's import and export RTs must match PE2's export and import RTs, respectively.

For configuration details, see Configuration Files in this section.

Configuring inter-AS MPLS EVPN Option B

# Configure ASBR1. Enable MPLS on GE 0/1/8 connected to ASBR2.

[~ASBR1] interface GigabitEthernet 0/1/8
[~ASBR1-GigabitEthernet0/1/8] ip address 192.168.1.1 24
[*ASBR1-GigabitEthernet0/1/8] mpls
[*ASBR1-GigabitEthernet0/1/8] quit
[*ASBR1] commit

On ASBR1, specify ASBR2 as an MP-EBGP peer, and disable ASBR1 from filtering received EVPN routes based on RTs.

[~ASBR1] bgp 100
[*ASBR1-bgp] peer 192.168.1.2 as-number 200
[*ASBR1-bgp] l2vpn-family evpn
[*ASBR1-bgp-af-EVPN] peer 192.168.1.2 enable
[*ASBR1-bgp-af-EVPN] undo policy vpn-target
[*ASBR1-bgp-af-EVPN] commit
[~ASBR1-bgp-af-EVPN] quit
[~ASBR1-bgp] quit

The configuration of ASBR2 is similar to that of ASBR1. For configuration details, see Configuration Files in this section.

Configuration Files

PE1 configuration file

#
sysname PE1
#
evpn vpn-instance evrf_1 bd-mode
  route-distinguisher 100:1
  vpn-target 1:1 export-extcommunity
  vpn-target 1:1 import-extcommunity
#
mpls lsr-id 1.1.1.9
#
mpls
#
bridge-domain 10
 evpn binding vpn-instance evrf_1
#
mpls ldp
 #
 ipv4-family
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.21.1.2 255.255.255.0
 mpls
 mpls ldp
#
interface GigabitEthernet0/1/8
 undo shutdown
#
interface GigabitEthernet0/1/8.1 mode l2
 encapsulation dot1q vid 10
 rewrite pop single
 bridge-domain 10
#
interface LoopBack1
 ip address 1.1.1.9 255.255.255.255
#
bgp 100
 peer 2.2.2.9 as-number 100
 peer 2.2.2.9 connect-interface LoopBack1
 #
 ipv4-family unicast
 undo synchronization
 peer 2.2.2.9 enable
 #
 l2vpn-family evpn
  policy vpn-target
  peer 2.2.2.9 enable
  peer 2.2.2.9 esad-route-compatible enable
#
ospf 1
 area 0.0.0.0
  network 1.1.1.9 0.0.0.0
  network 172.21.1.0 0.0.0.255
#
evpn source-address 1.1.1.9
#
return

ASBR1 configuration file

#
sysname ASBR1
#
mpls lsr-id 2.2.2.9
#
mpls
#
mpls ldp
 #
 ipv4-family
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.21.1.1 255.255.255.0
 mpls
 mpls ldp
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 192.168.1.1 255.255.255.0
 mpls
#
interface LoopBack1
 ip address 2.2.2.9 255.255.255.255
#
bgp 100
 peer 192.168.1.2 as-number 200
 peer 1.1.1.9 as-number 100
 peer 1.1.1.9 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 192.168.1.2 enable
  peer 1.1.1.9 enable
 #
 l2vpn-family evpn
  undo policy vpn-target
  peer 1.1.1.9 enable
  peer 1.1.1.9 esad-route-compatible enable
  peer 192.168.1.2 enable
  peer 192.168.1.2 esad-route-compatible enable
#
ospf 1
 area 0.0.0.0
  network 2.2.2.9 0.0.0.0
  network 172.21.1.0 0.0.0.255
#
return

ASBR2 configuration file

#
sysname ASBR2
#
mpls lsr-id 3.3.3.9
#
mpls
#
mpls ldp
 #
 ipv4-family
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.22.1.1 255.255.255.0
 mpls
 mpls ldp
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 192.168.1.2 255.255.255.0
 mpls
#
interface LoopBack1
 ip address 3.3.3.9 255.255.255.255
#
bgp 200
 peer 192.168.1.1 as-number 100
 peer 4.4.4.9 as-number 200
 peer 4.4.4.9 connect-interface LoopBack1
 #
 ipv4-family unicast
  undo synchronization
  peer 192.168.1.1 enable
  peer 4.4.4.9 enable
 #
 l2vpn-family evpn
  undo policy vpn-target
  peer 4.4.4.9 enable
  peer 4.4.4.9 esad-route-compatible enable
  peer 192.168.1.1 enable
  peer 192.168.1.1 esad-route-compatible enable
#
ospf 1
 area 0.0.0.0
  network 3.3.3.9 0.0.0.0
  network 172.22.1.0 0.0.0.255
#
return

PE2 configuration file

#
sysname PE2
#
evpn vpn-instance evrf_1 bd-mode
  route-distinguisher 200:1
  vpn-target 1:1 export-extcommunity
  vpn-target 1:1 import-extcommunity
#
mpls lsr-id 4.4.4.9
#
mpls
#
bridge-domain 10
 evpn binding vpn-instance evrf_1
#
mpls ldp
 #
 ipv4-family
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 172.22.1.2 255.255.255.0
 mpls
 mpls ldp
#
interface GigabitEthernet0/1/8
 undo shutdown
#
interface GigabitEthernet0/1/8.1 mode l2
 encapsulation dot1q vid 10
 rewrite pop single
 bridge-domain 10
#
interface LoopBack1
 ip address 4.4.4.9 255.255.255.255
#
bgp 200
 peer 3.3.3.9 as-number 200
 peer 3.3.3.9 connect-interface LoopBack1
 #
 ipv4-family unicast
 undo synchronization
 peer 3.3.3.9 enable
 #
 l2vpn-family evpn
  policy vpn-target
  peer 3.3.3.9 enable
  peer 3.3.3.9 esad-route-compatible enable
#
#
ospf 1
 area 0.0.0.0
  network 4.4.4.9 0.0.0.0
  network 172.22.1.0 0.0.0.255
#
evpn source-address 4.4.4.9
#
return