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[Enterprise SONiC] EVPN ARP/ND Suppression Follow

kojui_chang 張恪睿

August 23, 2024 11:26
Updated

Overview:

ARP Suppression will help to reply the arp request if the arp exist in arp table. It could help to save the needless arp traffic.

ARP Suppression run with vxlan solution.

Tested model & firmware version:

Switch model name:

AS5835-54X(T)

AS7362-56X

Edgecore SONiC version:

202006.4

202012.2

202111.3
202111.8

Restriction

Known issue:
- [SONIC-3452] In 202012 branch, "show neigh-suppress" command is removed.
- [SONIC-7383] Fix the issue that disabling neighbor suppression requires a reboot to take effect.( This behavior is resolved in version 2111.6)

ARP Suppression with SAG running on vxlan service

Topology:

Procedure:

Step 1. Init FRR and set the loopback interface(reference Management port and front port ipv4/ipv6 and FRR init)

Step 2. Create the Vlan and ip binding as topology

ND1:

admin@sonic:~$ sudo config vlan add 100
admin@sonic:~$ sudo config vlan member add -u 100 Ethernet0
admin@sonic:~$ sudo config interface ip add Vlan100 192.168.100.11/24
admin@sonic:~$ sudo config interface ip add Ethernet56 10.0.0.0/31

ND2:

admin@sonic:~$ sudo config vlan add 100
admin@sonic:~$ sudo config vlan member add 100 Ethernet0
admin@sonic:~$ sudo config interface ip add Vlan100 192.168.100.12/24
admin@sonic:~$ sudo config interface ip add Ethernet56 10.0.0.1/31

Step 3. Create Vxlan interface

ND1:

admin@sonic:~$ sudo config vxlan add vtep 1.1.1.1
admin@sonic:~$ sudo config vxlan evpn_nvo add nvo vtep
admin@sonic:~$ sudo config vxlan map add vtep 100 100

ND2:

admin@sonic:~$ sudo config vxlan add vtep 2.2.2.2
admin@sonic:~$ sudo config vxlan evpn_nvo add nvo vtep
admin@sonic:~$ sudo config vxlan map add vtep 100 100

Step 4. Enable ARP/ND suppress

ND1 and ND2:

admin@sonic:~$ sudo config neigh-suppress vlan 100 on

Step 5. Set the EVPN on FRR.

ND1:

sonic# configure
sonic(config)# router bgp 65100
sonic(config-router)# neighbor 10.0.0.1 remote-as internal
sonic(config-router)# bgp router-id 1.1.1.1
sonic(config-router)# address-family ipv4
sonic(config-router-af)# redistribute connected
sonic(config-router-af)# exit
sonic(config-router)# address-family l2vpn evpn
sonic(config-router-af)# advertise-all-vni
sonic(config-router-af)# neighbor 10.0.0.1 activate

ND2:

sonic# configure
sonic(config)# router bgp 65100
sonic(config-router)# neighbor 10.0.0.0 remote-as internal
sonic(config-router)# bgp router-id 2.2.2.2
sonic(config-router)# address-family ipv4
sonic(config-router-af)# redistribute connected
sonic(config-router-af)# exit
sonic(config-router)# address-family l2vpn evpn
sonic(config-router-af)# advertise-all-vni
sonic(config-router-af)# neighbor 10.0.0.0 activate

Step 6. Check the neighbor suppress

ND1:

admin@sonic:~$ show neigh-suppress vlan 100
  +---------+------------+---------------------+
  | VLAN    | STATUS     | ASSOCIATED_NETDEV   |
  +=========+============+=====================+
  | Vlan100 | Configured | vtep-100            |
  +---------+------------+---------------------+

ND2:

admin@sonic:~$ show neigh-suppress vlan 100
  +---------+------------+---------------------+
  | VLAN    | STATUS     | ASSOCIATED_NETDEV   |
  +=========+============+=====================+
  | Vlan100 | Configured | vtep-100            |
  +---------+------------+---------------------+

Step 7. Ping from Switch#1 to ND1

Step 8. Ping from Switch#2 to Switch1, we can't find arp request between Switch#1 from Switch#2. The ND2 will reply the arp request.

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Category

[Enterprise SONiC] EVPN ARP/ND Suppression Follow

Tested model & firmware version:

Restriction

ARP Suppression with SAG running on vxlan service

Topology:

Procedure:

Comments

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Edgecore Networks Corporation

END USER LICENSE AGREEMENT

1) Trademarks:

2) License grant:

3) Open Source Software:

4) Ownership and Copyright:

5) Unauthorized Use:

6) No Warranties:

7) Limited Liability:

8) Compliance with laws:

9) Termination:

10) Governing Law and Jurisdiction:

11) General:

Category

Tested model & firmware version:

Restriction

ARP Suppression with SAG running on vxlan service

Topology:

Procedure:

Related articles

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