! PermitANY — Arista EOS MLAG Configuration
! Multi-chassis Link Aggregation Group (MLAG) for Arista EOS switches: peer-link, keepalive (management), MLAG domain, and MLAG port-channels.
! Generated: 2026-09-20
! These are EXAMPLE values. Replace with your actual config before deploying.
!
hostname AR-LEAF-01
!
! ── MLAG Peer-link VLAN ──────────────────────────────────────────────
vlan 4094
   trunk group MLAG-PEER
   name MLAG-Peer-Link
!
! ── Peer-Link Port-Channel ───────────────────────────────────────────
interface Port-Channel1000
   description MLAG Peer-Link
   switchport mode trunk
   switchport trunk group MLAG-PEER
   spanning-tree link-type point-to-point
!

interface Ethernet49
   description MLAG-Peer-Link-Member
   channel-group 1000 mode active
   no shutdown
!

! ── MLAG Keepalive SVI ───────────────────────────────────────────────
interface Vlan4094
   description MLAG-Peer-Link-SVI
   ip address 10.0.0.1 255.255.255.252
   no autostate
   no shutdown
!
! ── MLAG Domain ──────────────────────────────────────────────────────
mlag configuration
   domain-id MLAG-DOMAIN-01
   local-interface Vlan4094
   peer-address 10.0.0.2
   peer-link Port-Channel1000
   heartbeat-interval 2500
   reload-delay mlag 300
   reload-delay non-mlag 330
!
! ── MLAG Port-Channels ───────────────────────────────────────────────

interface Port-Channel10
   description MLAG to Server-01
   switchport mode trunk
{{#if (eq sw_mode "trunk")}}
   switchport trunk allowed vlan 10,20
{{/if}}
{{#if (eq sw_mode "access")}}
   switchport access vlan 10
   spanning-tree portfast
{{/if}}
   mlag 10
   no shutdown
!
interface Ethernet10
   description Member-of-Po10-MLAG10
   channel-group 10 mode active
   no shutdown
!