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[Enterprise SONiC] Asymmetric EVPN IRB Follow

phoebe_zeng 曾麗凰

August 23, 2024 10:59
Updated

Asymmetric EVPN IRB

Tested model & firmware version:

Switch model name:

AS7326-56X

AS7726-32X

AS5835-54X(T)

Edgecore SONiC version:

202006.4

202012.2

202111.3

202111.8

Restriction:

EVPN only supports ipv4 in the current version, it doesn't support ipv6.

Asymmetric EVPN IRB

Topology:

Note :

BGP, EVPN and VxLAN related articles are available in here, Routing (BGP) , EVPN & VxLAN.
All VNI is belong to L2 VNI.
Since VXLAN routing traffic will be locally routed, encapsulated, and then sent out with the target subnet's VNI in asymmetric IRB, it is crucial to ensure consistency in VTEP VNI mapping and VLAN configuration settings across all endpoints. Otherwise, VXLAN routing may not be possible.

Procedure:

Step 1. Setup VLAN environment as topology. Please refer to VLAN & Inter-VLAN Routing article.

Step 2. Configure IP address on SONiC01 Ethernet48 and SONiC02 Ethernet52.

#SONiC01
admin@SONIC01:~$sudo config interface ip add Ethernet48 10.0.0.4/31

#SONiC02
admin@SONIC02:~$sudo config interface ip add Ethernet52 10.0.0.5/31

Step 3: Configure IP address to Loopback0 of both switches.

#SONiC01
admin@SONIC01:~$ sudo config interface ip add Loopback0 1.1.1.1/32

#SONiC02
admin@SONIC02:~$ sudo config interface ip add Loopback0 2.2.2.2/32

Step 4. Create VxLAN

#SONiC01

admin@SONIC01:~$sudo config vxlan add vtep 1.1.1.1                        → configuring VTEP_name (vtep) and its IP address 
admin@SONIC01:~$sudo config vxlan evpn_nvo add nvo vtep                   → create nvo_name (nvo) and bind it to VTEP_name (vtep)
admin@SONIC01:~$sudo config vxlan map add vtep 10 1000                    → mapping VNI 1000 to VLAN 10
admin@SONIC01:~$sudo config vxlan map add vtep 20 2000                    → mapping VNI 2000 to VLAN 20
admin@SONIC01:~$sudo config save -y

#SONiC02

admin@SONIC01:~$sudo config vxlan add vtep 2.2.2.2                        → configuring VTEP_name (vtep) and its IP address 
admin@SONIC01:~$sudo config vxlan evpn_nvo add nvo vtep                   → create nvo_name (nvo) and bind it to VTEP_name (vtep)
admin@SONIC01:~$sudo config vxlan map add vtep 10 1000                    → mapping VNI 1000 to VLAN 10
admin@SONIC01:~$sudo config vxlan map add vtep 20 2000                    → mapping VNI 2000 to VLAN 20
admin@SONIC01:~$sudo config save -y

Step 5. Establish BGP environment for EVPN.

#SONiC01

admin@7726:~$ vtysh                                                           → enter vtysh shell

Hello, this is FRRouting (version 7.2.1-sonic).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

sonic# configure terminal
sonic(config)#router bgp 65100                                                → assign BGP AS number
sonic(config-router)#neighbor 10.0.0.5 remote-as 65100                        → assign Ethernet48 IP address to connect via IBGP with peering on same AS
sonic(config-router)# address-family ipv4 unicast                             → Enter address-family ipv4
sonic(config-router-af)# network 1.1.1.1/32                                 → Announce 1.1.1.1 network
sonic(config-router-af)# exit
sonic(config-router)#address-family l2vpn evpn                           → enter EVPN setting
sonic(config-router-af)#neighbor 10.0.0.5 activate                → activate EVPN for neighbor 10.0.0.5
sonic(config-router-af)#advertise-all-vni                                    → advertise all VNI routing
sonic(config-router-af)#exit

#SONiC02

admin@7726:~$ vtysh                                                           → enter vtysh shell

Hello, this is FRRouting (version 7.2.1-sonic).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

sonic# configure terminal
sonic(config)#router bgp 65100                                                → assign BGP AS number
sonic(config-router)#neighbor 10.0.0.4 remote-as 65100                        → assign Ethernet52 IP address to connect via IBGP with peering on same AS
sonic(config-router)# address-family ipv4 unicast                            → Enter address-family ipv4
sonic(config-router-af)# network 2.2.2.2/32                                → Announce 2.2.2.2 network
sonic(config-router-af)# exit
sonic(config-router)#address-family l2vpn evpn                               → enter EVPN setting
sonic(config-router-af)#neighbor 10.0.0.4 activate                          → activate EVPN for neighbor 10.0.0.4
sonic(config-router-af)#advertise-all-vni                                    → advertise all VNI routing
sonic(config-router-af)#exit

Step 6. Check EVPN-VNI status in FRR.

#SONiC01

sonic# show evpn vni
VNI        Type VxLAN IF              # MACs   # ARPs   # Remote VTEPs  Tenant VRF
1000       L2   vtep-10               1        2        1               default
2000       L2   vtep-20               1        2        1               default

sonic# show evpn vni detail
VNI: 1000
 Type: L2
 Tenant VRF: default
 VxLAN interface: vtep-10
 VxLAN ifIndex: 67
 SVI interface: Vlan10
 SVI ifIndex: 9
 Local VTEP IP: 1.1.1.1
 Mcast group: 0.0.0.0
 Remote VTEPs for this VNI:
  2.2.2.2 flood: HER
 Number of MACs (local and remote) known for this VNI: 1
 Number of ARPs (IPv4 and IPv6, local and remote) known for this VNI: 2
 Advertise-gw-macip: No
 Advertise-svi-macip: No

VNI: 2000
 Type: L2
 Tenant VRF: default
 VxLAN interface: vtep-20
 VxLAN ifIndex: 68
 SVI interface: Vlan20
 SVI ifIndex: 10
 Local VTEP IP: 1.1.1.1
 Mcast group: 0.0.0.0
 Remote VTEPs for this VNI:
  2.2.2.2 flood: HER
 Number of MACs (local and remote) known for this VNI: 1
 Number of ARPs (IPv4 and IPv6, local and remote) known for this VNI: 2
 Advertise-gw-macip: No
 Advertise-svi-macip: No

#SONiC02

sonic# show evpn vni
VNI        Type VxLAN IF              # MACs   # ARPs   # Remote VTEPs  Tenant VRF
1000       L2   vtep-10               1        2        1               default
2000       L2   vtep-20               1        2        1               default

sonic# show evpn vni detail
VNI: 1000
 Type: L2
 Tenant VRF: default
 VxLAN interface: vtep-10
 VxLAN ifIndex: 67
 SVI interface: Vlan10
 SVI ifIndex: 65
 Local VTEP IP: 2.2.2.2
 Mcast group: 0.0.0.0
 Remote VTEPs for this VNI:
  1.1.1.1 flood: HER
 Number of MACs (local and remote) known for this VNI: 1
 Number of ARPs (IPv4 and IPv6, local and remote) known for this VNI: 2
 Advertise-gw-macip: No
 Advertise-svi-macip: No

VNI: 2000
 Type: L2
 Tenant VRF: default
 VxLAN interface: vtep-20
 VxLAN ifIndex: 68
 SVI interface: Vlan20
 SVI ifIndex: 66
 Local VTEP IP: 2.2.2.2
 Mcast group: 0.0.0.0
 Remote VTEPs for this VNI:
  1.1.1.1 flood: HER
 Number of MACs (local and remote) known for this VNI: 1
 Number of ARPs (IPv4 and IPv6, local and remote) known for this VNI: 2
 Advertise-gw-macip: No
 Advertise-svi-macip: No

Step 7. Check BGP EVPN status.

#SONiC01

sonic# show bgp l2vpn evpn
BGP table version is 3, local router ID is 192.168.2.253
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
EVPN type-1 prefix: [1]:[EthTag]:[ESI]:[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
Route Distinguisher: 192.168.2.253:2
*> [2]:[0]:[48]:[b8:6a:97:19:ba:12]
                    1.1.1.1                            32768 i
                    ET:8 RT:65100:1000
*> [2]:[0]:[48]:[b8:6a:97:19:ba:12]:[32]:[192.168.1.1]
                    1.1.1.1                            32768 i
                    ET:8 RT:65100:1000
*> [3]:[0]:[32]:[1.1.1.1]
                    1.1.1.1                            32768 i
                    ET:8 RT:65100:1000
Route Distinguisher: 192.168.2.253:3
*> [3]:[0]:[32]:[1.1.1.1]
                    1.1.1.1                            32768 i
                    ET:8 RT:65100:2000
Route Distinguisher: 192.168.2.254:2
*>i[3]:[0]:[32]:[2.2.2.2]
                    2.2.2.2                       100      0 i
                    RT:65100:1000 ET:8
Route Distinguisher: 192.168.2.254:3
*>i[2]:[0]:[48]:[80:a2:35:5a:22:50]
                    2.2.2.2                       100      0 i
                    RT:65100:2000 ET:8
*>i[2]:[0]:[48]:[80:a2:35:5a:22:50]:[32]:[192.168.2.1]
                    2.2.2.2                       100      0 i
                    RT:65100:2000 ET:8
*>i[3]:[0]:[32]:[2.2.2.2]
                    2.2.2.2                       100      0 i
                    RT:65100:2000 ET:8

Displayed 8 out of 8 total prefixes

sonic# show bgp l2vpn evpn
BGP table version is 9, local router ID is 192.168.2.254
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
EVPN type-1 prefix: [1]:[EthTag]:[ESI]:[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
Route Distinguisher: 192.168.2.253:2
*>i[2]:[0]:[48]:[b8:6a:97:19:ba:12]
                    1.1.1.1                       100      0 i
                    RT:65100:1000 ET:8
*>i[2]:[0]:[48]:[b8:6a:97:19:ba:12]:[32]:[192.168.1.1]
                    1.1.1.1                       100      0 i
                    RT:65100:1000 ET:8
*>i[3]:[0]:[32]:[1.1.1.1]
                    1.1.1.1                       100      0 i
                    RT:65100:1000 ET:8
Route Distinguisher: 192.168.2.253:3
*>i[3]:[0]:[32]:[1.1.1.1]
                    1.1.1.1                       100      0 i
                    RT:65100:2000 ET:8
Route Distinguisher: 192.168.2.254:2
*> [3]:[0]:[32]:[2.2.2.2]
                    2.2.2.2                            32768 i
                    ET:8 RT:65100:1000
Route Distinguisher: 192.168.2.254:3
*> [2]:[0]:[48]:[80:a2:35:5a:22:50]
                    2.2.2.2                            32768 i
                    ET:8 RT:65100:2000
*> [2]:[0]:[48]:[80:a2:35:5a:22:50]:[32]:[192.168.2.1]
                    2.2.2.2                            32768 i
                    ET:8 RT:65100:2000
*> [3]:[0]:[32]:[2.2.2.2]
                    2.2.2.2                            32768 i
                    ET:8 RT:65100:2000

Displayed 8 out of 8 total prefixes

Step 8. Check VNI MAC learning.

#SONiC01

sonic# show evpn mac vni all

VNI 1000 #MACs (local and remote) 1

Flags: N=sync-neighs, I=local-inactive, P=peer-active, X=peer-proxy
MAC               Type   Flags Intf/Remote ES/VTEP            VLAN  Seq #'s
b8:6a:97:19:ba:12 local        Ethernet52                     10    0/0

VNI 2000 #MACs (local and remote) 1

Flags: N=sync-neighs, I=local-inactive, P=peer-active, X=peer-proxy
MAC               Type   Flags Intf/Remote ES/VTEP            VLAN  Seq #'s
80:a2:35:5a:22:50 remote       2.2.2.2                              0/0

#SONiC02

sonic# show evpn mac vni all

VNI 1000 #MACs (local and remote) 1

Flags: N=sync-neighs, I=local-inactive, P=peer-active, X=peer-proxy
MAC               Type   Flags Intf/Remote ES/VTEP            VLAN  Seq #'s
b8:6a:97:19:ba:12 remote       1.1.1.1                              0/0

VNI 2000 #MACs (local and remote) 1

Flags: N=sync-neighs, I=local-inactive, P=peer-active, X=peer-proxy
MAC               Type   Flags Intf/Remote ES/VTEP            VLAN  Seq #'s
80:a2:35:5a:22:50 local        Ethernet56                     20    0/0

Step 9. Check ARP learning table. Hosts ARP shall be learnt by both switches.

#SONiC01

sonic# show evpn arp-cache vni all

VNI 1000 #ARP (IPv4 and IPv6, local and remote) 2

Flags: I=local-inactive, P=peer-active, X=peer-proxy
Neighbor        Type   Flags State    MAC               Remote ES/VTEP                 Seq #'s
192.168.1.253   local        inactive 68:21:5f:29:c0:d2                                0/0
192.168.1.1     local        active   b8:6a:97:19:ba:12                                0/0

VNI 2000 #ARP (IPv4 and IPv6, local and remote) 2

Flags: I=local-inactive, P=peer-active, X=peer-proxy
Neighbor        Type   Flags State    MAC               Remote ES/VTEP                 Seq #'s
192.168.2.254   local        inactive 68:21:5f:29:c0:d2                                0/0
192.168.2.1     remote       active   80:a2:35:5a:22:50 2.2.2.2                        0/0

#SONiC02

sonic# show evpn arp-cache vni all

VNI 1000 #ARP (IPv4 and IPv6, local and remote) 2

Flags: I=local-inactive, P=peer-active, X=peer-proxy
Neighbor        Type   Flags State    MAC               Remote ES/VTEP                 Seq #'s
192.168.1.254   local        inactive 00:a0:c9:00:00:00                                0/0
192.168.1.1     remote       active   b8:6a:97:19:ba:12 1.1.1.1                        0/0

VNI 2000 #ARP (IPv4 and IPv6, local and remote) 2

Flags: I=local-inactive, P=peer-active, X=peer-proxy
Neighbor        Type   Flags State    MAC               Remote ES/VTEP                 Seq #'s
192.168.2.253   local        inactive 00:a0:c9:00:00:00                                0/0
192.168.2.1     local        active   80:a2:35:5a:22:50                                0/0

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