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BETA Feature

The MPLS design feature is in BETA until the release of AVD 4.0.0. Changes to data models and default behavior for the MPLS design should be expected.

Fabric Variables for MPLS Design

  • The MPLS design supports any fabric variables already supported by l3ls-evpn, barring the exceptions outlined in this document.
  • Additionally the MPLS design supports several new fabric variables that are outlined in this document.
  • The fabric underlay and overlay topology variables, define the elements related to build the L3 Leaf and Spine fabric.
  • The following underlay routing protocols are supported:
    • ISIS-SR (default)
    • ISIS + LDP
    • ISIS-SR + LDP
    • OSPF + LDP
  • The following overlay routing protocols are supported:
    • IBGP (default)
  • Only summary network addresses need to be defined. IP addresses are then assigned to each node, based on its unique device id.
    • To view IP address allocation and consumption, a summary is provided in the auto-generated fabric documentation in Markdown and CSV format.
  • The variables described in this document should be applied to all devices in the fabric.

New Variables and Options

# Fabric Name | Required
# Required to match an Ansible Group name covering all devices in the Fabric
fabric_name: < Fabric_Name >

# Underlay routing protocol | Required.
underlay_routing_protocol: < isis-sr | isis-ldp | isis-sr-ldp | ospf-ldp | default -> isis-sr >
overlay_routing_protocol: < ibgp | default -> ibgp >

# Underlay ISIS parameters
isis_default_is_type: < level-1 | level-2 | level-1-2 | default -> level-1-2 >
isis_default_circuit_type: < level-1 | level-2 | level-1-2 | default -> level-1-2 >
isis_default_metric: < int >
isis_advertise_passive_only: < true | false | default -> false >

# Underlay ISIS TI-LFA parameters
isis_ti_lfa:
  enabled: < true | false | default -> false >
  protection: < link | node | default -> link >
  # Microloop protection delay in ms
  local_convergence_delay: < int | default -> 10000 >

# Underlay IPv6 turns on ipv6 for the underlay, which requires loopback_ipv6_pool to be defined.
underlay_ipv6: < true | false | default -> false >

# Whether to configure an iBGP full mesh between PEs, either because there is no RR used or other reasons.
bgp_mesh_pes: < true | false | default -> false >

# BGP peer groups encrypted password
# mpls_overlay_peers | Required
# rr_overlay_peers | Optional (Used to peer route reflectors in the same node-group (rr cluster) to each other)
# Leverage an Arista EOS switch to generate the encrypted password using the correct peer group name.
# Note that the name of the peer groups use '-' instead of '_' in EOS configuration.
bgp_peer_groups:
  mpls_overlay_peers:
    name: < name of peer group | default -> MPLS-OVERLAY-PEERS >
    password: "< encrypted password >"
    # Custom structured config added under router_bgp.peer_groups.<name> for eos_cli_config_gen
    structured_config: < dictionary >
  rr_overlay_peers:
    name: < name of peer group | default -> RR-OVERLAY-PEERS >
    password: "< encrypted password >"
    # Custom structured config added under router_bgp.peer_groups.<name> for eos_cli_config_gen
    structured_config: < dictionary >

Unsupported Fabric Variables

The following fabric variables or variable values are not supported with the MPLS design.

underlay_routing_protocol: < ebgp | isis | ospf >
overlay_routing_protocol: ebgp
underlay_rfc5549: < true | false | default -> false >
vtep_vvtep_ip: < IPv4_address/Mask >
evpn_ebgp_multihop: < ebgp_multihop | default -> 3 >
inband_management_subnet: < IPv4_network/Mask >
inband_management_vlan: < vlan_id >
Last update: January 24, 2023