Example for Configuring BGP Unnumbered EVPN Fabric

Owned by Tracy Yang
Nov 28, 2023
6 min read

Networking Requirements

Figure 1. BGP Unnumbered EVPN Fabric Configuration Example

As shown in Figure 1, this example configures BGP unnumbered on EVPN VTEP devices Switch A and Switch B. An eBGP connection is established between Switch A and Switch B.

In this example, routed interfaces are configured f to be used as BGP unnumbered interfaces for EVPN underlay fabric.

The only difference between a BGP unnumbered configuration and the BGP numbered configuration is that the BGP neighbor is specified as an interface instead of an IP address. The interfaces connecting the two peers do not need to have IP addresses configured on each side.

NOTE:

The ebgp-requires-policy function needs to be disabled in EBGP, no need in IBGP.

Procedure

Switch A

 Step 1       Configure physical interfaces, VLAN interfaces and VRF.

admin@SwitchA# set vlans vlan-id 5 l3-interface vlan-5
admin@SwitchA# set vlans vlan-id 6 l3-interface vlan-6
admin@SwitchA# set vlans vlan-id 7 l3-interface vlan-7
admin@SwitchA# set interface gigabit-ethernet te-1/1/30 routed-interface enable true
admin@SwitchA# set interface gigabit-ethernet te-1/1/30 routed-interface name rif-30
admin@SwitchA# set interface gigabit-ethernet te-1/1/23 family ethernet-switching native-vlan-id 6
admin@SwitchA# set interface gigabit-ethernet te-1/1/23 family ethernet-switching port-mode trunk
admin@SwitchA# set interface gigabit-ethernet te-1/1/23 family ethernet-switching vlan members 5
admin@SwitchA# set interface gigabit-ethernet te-1/1/23 family ethernet-switching vlan members 7
admin@SwitchA# set vlans reserved-vlan 3000-3100
admin@SwitchA# set l3-interface routed-interface rif-30
admin@SwitchA# set ip vrf vrf1
admin@SwitchA# set l3-interface vlan-interface vlan-5 vrf vrf1
admin@SwitchA# set l3-interface vlan-interface vlan-6 vrf vrf1
admin@SwitchA# set l3-interface vlan-interface vlan-6 address 192.168.60.1 prefix-length 24
admin@SwitchA# set l3-interface vlan-interface vlan-7 vrf vrf1
admin@SwitchA# set l3-interface vlan-interface vlan-7 address 192.168.70.1 prefix-length 24

Step 2       Configure EBGP and BGP related configuration.

admin@SwitchA# set protocols bgp local-as 65001
admin@SwitchA# set protocols bgp router-id 49.49.49.49
admin@SwitchA# set protocols bgp interface rif-30 remote-as 65002
admin@SwitchA# set protocols bgp interface rif-30 ipv6-unicast activate true
admin@SwitchA# set protocols bgp interface rif-30 capability extended-nexthop
admin@SwitchA# set protocols bgp ebgp-requires-policy false
admin@SwitchA# set protocols bgp ipv4-unicast network 49.49.49.49/32
admin@SwitchA# set protocols bgp evpn advertise-all-vni
admin@SwitchA# set protocols bgp evpn advertise ipv4-unicast
admin@SwitchA# set protocols bgp evpn advertise ipv6-unicast
admin@SwitchA# set protocols bgp evpn advertise-svi-ip
admin@SwitchA# set protocols bgp vrf vrf1 local-as 65001
admin@SwitchA# set protocols bgp vrf vrf1 router-id 49.49.49.49
admin@SwitchA# set protocols bgp vrf vrf1 ipv4-unicast network 192.168.60.0/24
admin@SwitchA# set protocols bgp vrf vrf1 evpn advertise ipv4-unicast
admin@SwitchA# set protocols bgp vrf vrf1 evpn advertise ipv6-unicast

Step 3       Enable IP routing.

admin@SwitchA# set ip routing enable true

Step 4       Configure VXLAN source interface, VXLAN VNI and map VNI IDs to VLAN IDs. Also create an L3 VNI in vrf1.

admin@SwitchA# set vxlans source-interface lo address 49.49.49.49
admin@SwitchA# set vxlans vni 999 vlan 5
admin@SwitchA# set vxlans vni 9991000 vlan 6
admin@SwitchA# set vxlans vni 9991007 vlan 7
admin@SwitchA# set vxlans vrf vrf1 l3-vni 999

Step 5       Commit the configuration.

admin@SwitchA# commit

Switch B

Step 1       Configure physical interfaces, VLAN interfaces and VRF.

admin@SwitchB# set vlans vlan-id 5 l3-interface vlan-5
admin@SwitchB# set vlans vlan-id 6 l3-interface vlan-6
admin@SwitchB# set vlans vlan-id 8 l3-interface vlan-8
admin@SwitchB# set interface gigabit-ethernet ge-1/1/30 routed-interface enable true
admin@SwitchB# set interface gigabit-ethernet ge-1/1/30 routed-interface name rif-30
admin@SwitchB# set interface gigabit-ethernet ge-1/1/23 family ethernet-switching native-vlan-id 6
admin@SwitchB# set interface gigabit-ethernet ge-1/1/23 family ethernet-switching port-mode trunk
admin@SwitchB# set interface gigabit-ethernet ge-1/1/23 family ethernet-switching vlan members 5
admin@SwitchB# set interface gigabit-ethernet ge-1/1/23 family ethernet-switching vlan members 8
admin@SwitchB# set vlans reserved-vlan 3000-3100
admin@SwitchB# set l3-interface routed-interface rif-30
admin@SwitchB# set ip vrf vrf1
admin@SwitchB# set l3-interface vlan-interface vlan-5 vrf vrf1
admin@SwitchB# set l3-interface vlan-interface vlan-6 vrf vrf1
admin@SwitchB# set l3-interface vlan-interface vlan-6 address 192.168.60.2 prefix-length 24
admin@SwitchB# set l3-interface vlan-interface vlan-8 vrf vrf1
admin@SwitchB# set l3-interface vlan-interface vlan-8 address 192.168.80.1 prefix-length 24

Step 2       Configure EBGP and BGP related configuration.

admin@SwitchB# set protocols bgp local-as 65002
admin@SwitchB# set protocols bgp router-id 57.57.57.57
admin@SwitchB# set protocols bgp interface rif-30 remote-as 65001
admin@SwitchB# set protocols bgp interface rif-30 ipv6-unicast activate true
admin@SwitchB# set protocols bgp interface rif-30 capability extended-nexthop
admin@SwitchB# set protocols bgp ebgp-requires-policy false
admin@SwitchB# set protocols bgp ipv4-unicast network 57.57.57.57/32
admin@SwitchB# set protocols bgp evpn advertise-all-vni
admin@SwitchB# set protocols bgp evpn advertise ipv4-unicast
admin@SwitchB# set protocols bgp evpn advertise ipv6-unicast
admin@SwitchB# set protocols bgp evpn advertise-svi-ip
admin@SwitchB# set protocols bgp vrf vrf1 local-as 65002
admin@SwitchB# set protocols bgp vrf vrf1 router-id 57.57.57.57
admin@SwitchB# set protocols bgp vrf vrf1 ipv4-unicast network 192.168.80.0/24
admin@SwitchB# set protocols bgp vrf vrf1 evpn advertise ipv4-unicast
admin@SwitchB# set protocols bgp vrf vrf1 evpn advertise ipv6-unicast

Step 3       Enable IP routing.

admin@SwitchB# set ip routing enable true

Step 4       Configure VXLAN source interface, VXLAN VNI and map VNI IDs to VLAN IDs. Also create an L3 VNI in vrf1.

admin@SwitchB# set vxlans source-interface lo address 57.57.57.57
admin@SwitchB# set vxlans vni 999 vlan 5
admin@SwitchB# set vxlans vni 9991000 vlan 6
admin@SwitchB# set vxlans vni 9991008 vlan 8
admin@SwitchB# set vxlans vrf vrf1 l3-vni 999

Step 5       Commit the configuration. 

admin@SwitchB# commit

Verify the Configuration

  • Run the run l3-interface routed-interface <interface-name> command to check the information of the unnumbered BGP interface.
admin@SwitchB# run show l3-interface routed-interface rif-30
rif-30         Hwaddr 18:5A:58:03:35:81, Vlan:3000, MTU: 1500, State:UP
            Inet addr: fe80::1a5a:5810:503:3581/64
            Traffic statistics:
              5 sec input rate IPv4 0 packets/sec, IPv6 0 packets/sec
              5 sec forwarding rate IPv4 0 packets/sec, IPv6 0 packets/sec
              IPv4 Input Packets............................0
              IPv4 Forwarding Packets.......................0
              IPv6 Input Packets............................0
              IPv6 Forwarding Packets.......................0
  • Run the run show bgp neighbor command to check the BGP neighbor state.
admin@SwitchB# run show bgp neighbor
BGP neighbor on rif-30: fe80::1a5a:5820:41f:63a1, remote AS 65001, local AS 65002, external link
Hostname: localhost
  BGP version 4, remote router ID 49.49.49.49, local router ID 57.57.57.57
  BGP state = Established, up for 06:04:23
 ……
  • Run the run show bgp evpn route command to check the EVPN route information.
admin@SwitchB# run show bgp evpn route
BGP table version is 6, local router ID is 57.57.57.57
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
EVPN type-1 prefix: [1]:[ESI]:[EthTag]:[IPlen]:[VTEP-IP]
EVPN type-2 prefix: [2]:[EthTag]:[MAClen]:[MAC]:[IPlen]:[IP]
EVPN type-3 prefix: [3]:[EthTag]:[IPlen]:[OrigIP]
EVPN type-4 prefix: [4]:[ESI]:[IPlen]:[OrigIP]
EVPN type-5 prefix: [5]:[EthTag]:[IPlen]:[IP] 

   Network          Next Hop            Metric LocPrf Weight Path
                    Extended Community
Route Distinguisher: 49.49.49.49:2
*> [5]:[0]:[24]:[192.168.60.0]
                    49.49.49.49              0             0 65001 i
                    RT:65001:999 ET:8 Rmac:18:5a:58:1f:63:a1
Route Distinguisher: 49.49.49.49:3
*> [2]:[0]:[48]:[18:5a:58:1f:63:a1]:[32]:[192.168.60.1]
                    49.49.49.49                            0 65001 i
                    RT:65001:999 RT:65001:9991000 ET:8 Rmac:18:5a:58:1f:63:a1
*> [2]:[0]:[48]:[18:5a:58:1f:63:a1]:[128]:[fe80::1a5a:5820:21f:63a1]
                    49.49.49.49                            0 65001 i
                    RT:65001:9991000 ET:8
*> [3]:[0]:[32]:[49.49.49.49]
                    49.49.49.49                            0 65001 i
                    RT:65001:9991000 ET:8
Route Distinguisher: 49.49.49.49:4
*> [2]:[0]:[48]:[18:5a:58:1f:63:a1]:[32]:[192.168.70.1]
                    49.49.49.49                            0 65001 i
                    RT:65001:999 RT:65001:9991007 ET:8 Rmac:18:5a:58:1f:63:a1
*> [2]:[0]:[48]:[18:5a:58:1f:63:a1]:[128]:[fe80::1a5a:5820:31f:63a1]
                    49.49.49.49                            0 65001 i
                    RT:65001:9991007 ET:8
*> [3]:[0]:[32]:[49.49.49.49]
                    49.49.49.49                            0 65001 i
                    RT:65001:9991007 ET:8
Route Distinguisher: 57.57.57.57:2
*> [5]:[0]:[24]:[192.168.80.0]
                    57.57.57.57              0         32768 i
                    ET:8 RT:65002:999 Rmac:18:5a:58:03:35:81
Route Distinguisher: 57.57.57.57:3
*> [2]:[0]:[48]:[18:5a:58:03:35:81]:[32]:[192.168.60.2]
                    57.57.57.57                        32768 i
                    ET:8 RT:65002:9991000 RT:65002:999 Rmac:18:5a:58:03:35:81
*> [2]:[0]:[48]:[18:5a:58:03:35:81]:[128]:[fe80::1a5a:5810:203:3581]
                    57.57.57.57                        32768 i
                    ET:8 RT:65002:9991000
*> [3]:[0]:[32]:[57.57.57.57]
                    57.57.57.57                        32768 i
                    ET:8 RT:65002:9991000
Route Distinguisher: 57.57.57.57:4
*> [2]:[0]:[48]:[18:5a:58:03:35:81]:[32]:[192.168.80.1]
                    57.57.57.57                        32768 i
                    ET:8 RT:65002:9991008 RT:65002:999 Rmac:18:5a:58:03:35:81
*> [2]:[0]:[48]:[18:5a:58:03:35:81]:[128]:[fe80::1a5a:5810:403:3581]
                    57.57.57.57                        32768 i
                    ET:8 RT:65002:9991008
*> [3]:[0]:[32]:[57.57.57.57]
                    57.57.57.57                        32768 i
                    ET:8 RT:65002:9991008 

Displayed 14 prefixes (14 paths)
  • Run the run show vxlan tunnel command to check the VXLAN tunnel information.
admin@SwitchB# run show vxlan tunnel
Total number of tunnels: 2 

VNI 999, Encap:service-vlan-delete, Decap:service-vlan-add-replace
  src addr:57.57.57.57, dst addr:49.49.49.49, state:UP
  traffic type:unicast
  Vtep type:EVPN
  nexthops:fe80::1a5a:5820:41f:63a1
  output ports:ge-1/1/30 

VNI 9991000, Encap:service-vlan-delete, Decap:service-vlan-add-replace
  src addr:57.57.57.57, dst addr:49.49.49.49, state:UP
  traffic type:all
  Vtep type:EVPN
  nexthops:fe80::1a5a:5820:41f:63a1
  output ports:ge-1/1/30
  • Run the run show vxlan evpn route command to check the VXLAN route information.
admin@SwitchB# run show vxlan evpn route
VRF       ROUTE             NextHop          VNI         Interface
--------  ----------------  ---------------  ----------  -----------------
vrf1      192.168.60.1/32   49.49.49.49      999         vlan-5        
vrf1      192.168.60.0/24   49.49.49.49      999         vlan-5         
vrf1      192.168.70.1/32   49.49.49.49      999         vlan-5
  • Run the run show route vrf vrf1 command to check the route information for vrf1.
admin@SwitchB# run show route vrf vrf1
show ip route vrf vrf1
=======================
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, A - Babel, F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure 

VRF vrf1:
K>* 0.0.0.0/0 [255/8192] unreachable (blackhole), 06:07:34
B   192.168.60.0/24 [20/0] via 49.49.49.49, vlan-5 onlink, weight 1, 02:03:03
C>* 192.168.60.0/24 is directly connected, vlan-6, 05:38:57
B>* 192.168.60.1/32 [20/0] via 49.49.49.49, vlan-5 onlink, weight 1, 02:03:03
B>* 192.168.70.1/32 [20/0] via 49.49.49.49, vlan-5 onlink, weight 1, 02:03:03
C>* 192.168.80.0/24 is directly connected, vlan-8, 05:38:57
 

show ipv6 route vrf vrf1
=========================
Codes: K - kernel route, C - connected, S - static, R - RIPng,
       O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
       A - Babel, F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued, r - rejected, b - backup
       t - trapped, o - offload failure 

VRF vrf1:
K>* ::/0 [255/8192] unreachable (blackhole), 06:07:36
C * fe80::/64 is directly connected, vlan-8, 05:38:58
C * fe80::/64 is directly connected, vlan-6, 05:38:58
C>* fe80::/64 is directly connected, vlan-5, 06:07:34



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