MLAG Configuration

Question 1

1st step of MLAG Configuration in Arista?

Answer 1

1. Create Peer VLAN for MLAG Control Traffic.

vlan 4092
name MLAG-PEER
trunk group mlagpeer

Question 2

2nd step of MLAG Configuration in Arista?

Answer 2

2. Configure the MLAG Peer-Link.

interface Ethernetx-x
channel-group 100 mode active

interface Port-Channel100
description MLAG Peer-Link
switchport
switchport mode trunk
switchport trunk allowed vlan 4092
switchport trunk group mlagpeer
spanning-tree portfast network
spanning-tree bpdufilter enable

Question 3

3rd step of MLAG Configuration in Arista?

Answer 3

3. Configure the Peer VLAN Interface.

interface Vlan4092
ip address <Leaf1-IP>/31 # e.g., 10.90.90.1/31 (Leaf1), 10.90.90.2/31 (Leaf2)</Leaf1-IP>

Question 4

4th step of MLAG Configuration in Arista?

Answer 4

4. Enable and Configure MLAG.

mlag configuration
domain-id <MLAG-DOMAIN-NAME>
local-interface Vlan4092
peer-address <peer-IP> # Opposite side of /31
peer-link Port-Channel100</peer-IP></MLAG-DOMAIN-NAME>

Question 5

5th step of MLAG Configuration in Arista?

Answer 5

5. Configure Client-Facing MLAG Interfaces.

• Use the same mlag ID on both switches for Port-Channel10.

interface Ethernet5
channel-group 10 mode active

interface Port-Channel10
switchport
switchport mode access
switchport access vlan 200
mlag 10

Question 6

How to validate MLAG Status?

Answer 6

6. Validate MLAG Status.

show mlag
show mlag interfaces
show mlag detail