Dell Networking SONiC How to configure Static Anycast gateway (anycast address)

Summary: This article explains how to configure Static Anycast Gateway (anycast address) in Dell Networking Enterprise SONiC.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Instructions

 

Prerequisites

We are using standard interface naming to demonstrate the concepts. See the article Dell Networking S-Series: Basic Interface Configuration – SONiC 4.0 for more information regarding interface naming

 

Index

Static Anycast Gateway
SAG in MCLAG
Configuration Syntax
Sample Configuration
 

Static Anycast Gateway

Static Anycast Gateway (SAG) enables multiple switches to route packets simultaneously using a shared gateway address in an active/active router configuration. Each switch is configured with an anycast virtual IP address and an anycast virtual MAC address. The anycast virtual MAC is shared across all configured anycast IP addresses.
In a spine-leaf EVPN setup, all gateway-routed leaf switches have consistent anycast configurations. Specifically, each switch is set up with the same anycast virtual IP address and anycast virtual MAC address.
 

SAG in MCLAG

Use Static Anycast Gateway instead on VRRP when Multi-chassis link Aggregation (MCLAG) is used in Dell SONiC. Configure the same anycast IP address and anycast MAC address on both MCLAG Peers on the same vlan interface.
In Dell Enterprise SONiC, MCLAG does not currently support VRRP. As of the latest version (Dell SONiC 4.2), this statement remains accurate. For future compatibility, see the user guide for your version.

As an example, in the below topology we are using same anycast IP address 10.0.0.254/24 for vlan 100 in both MCLAG peers. 


Sample MCLAG anycast ip address

NOTE:
  • Anycast IP address cannot be used for management purpose. 
  • Anycast virtual MAC address cannot be a multicast MAC address.

 

Configuration Syntax

 
Configuration Explanation 
admin@DELLSONiC:~$ sonic-cli   
 Enter Dell SONiC CLI                    
DELLSONiC# configure terminal
 Enter configure mode.  
DELLSONiC(config)# ip anycast-address enable
 Enable anycast gateway address 
DELLSONiC(config)# ip anycast-mac-address xx:xx:xx:xx:xx:xx
 Configure anycast MAC address 
DELLSONiC(config)# interface Vlan <vlan ID>   
 Configure vlan 
DELLSONiC(config-if-Vlan-<ID>)# ip anycast-address <A.B.C.D/mask>
 Configure anycast gateway address

To Disable anycast gateway:
 
Configuration Explanation 
DELLSONiC(config)# ip anycast-address disable                                    
 Disable Anycast gateway address
 
To Verify use bellow command:
 
Configuration Explanation 
DELLSONiC# show ip static-anycast-gateway 
 View details on static-anycast-gateway          

 
 

Sample Configuration

Configuring IP anycast-address in Vlan 100:  
admin@DELLSONiC:~$ sonic-cli
DELLSONiC# configure terminal
DELLSONiC(config)# ip anycast-mac-address 00:11:22:33:44:55
DELLSONiC(config)# ip anycast-address enable

Lets configure anycast IP in interface vlan 100

DELLSONiC(config)# interface Vlan 100
DELLSONiC(config-if-Vlan100)# ip anycast-address 10.0.0.254/24
DELLSONiC(config-if-Vlan100)# end
DELLSONiC#

To verify the IP address for Vlan 100:
  
DELLSONiC# show ip interfaces
Flags: U-Unnumbered interface, A-Anycast IP
-----------------------------------------------------------------------------------------------------------------
Interface            IP address/mask                              VRF                 Admin/Oper     Flags
-----------------------------------------------------------------------------------------------------------------
Vlan100              10.0.0.254/24                                                    up/up          A

To verify static anycast gateways:
  
DELLSONiC# show ip static-anycast-gateway
Configured Anycast Gateway MAC address: 00:11:22:33:44:55
IPv4 Anycast Gateway MAC address: enable
Total number of gateway: 1
Total number of gateway admin UP: 1
Total number of gateway oper UP: 1
Interfaces           Gateway Address      Vrf             Admin/Oper
-------------------  ---------------      --------------- ----------
Vlan10               10.0.0.254/24                             up/up

Affected Products

Enterprise SONiC Distribution, PowerSwitch E3200-ON Series, Dell EMC Networking N3200-ON, PowerSwitch S5212F-ON, PowerSwitch S5224F-ON, PowerSwitch S5232F-ON, PowerSwitch S5248F-ON, PowerSwitch S5296F-ON, PowerSwitch Z9100-ON, PowerSwitch Z9264F-ON , PowerSwitch Z9332F-ON, PowerSwitch Z9432F-ON ...
Article Properties
Article Number: 000223335
Article Type: How To
Last Modified: 20 Mar 2024
Version:  3
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