arista-evpn-vxlan-clab/hosts

Host Interface Configuration Files

This directory contains network interface configuration files for Alpine Linux hosts in the ContainerLab topology.

Files

• host1_interfaces - Configuration for host1 (VLAN 40, IP 10.40.40.101)
• host2_interfaces - Configuration for host2 (VLAN 34, IP 10.34.34.102)
• host3_interfaces - Configuration for host3 (VLAN 40, IP 10.40.40.103)
• host4_interfaces - Configuration for host4 (VLAN 78, IP 10.78.78.104)

Usage

Each file is mounted to /etc/network/interfaces in its respective host container via ContainerLab's binds feature:

host1:
    kind: linux
    image: alpine:latest
    binds:
        - hosts/host1_interfaces:/etc/network/interfaces

Format

Files use Debian/Alpine ifupdown format with bonding and VLAN extensions:

auto lo
iface lo inet loopback

auto bond0
iface bond0 inet manual
    bond-mode 4                  # LACP (802.3ad)
    bond-miimon 100
    bond-lacp-rate 1
    bond-slaves eth1 eth2

auto bond0.<vlan>
iface bond0.<vlan> inet static
    address <ip-address>
    netmask 255.255.255.0
    vlan-raw-device bond0

Key Concepts

LACP Bonding

• All hosts use mode 4 (802.3ad LACP) bonding
• Dual-homed to MLAG leaf pairs for redundancy
• Requires matching LACP configuration on switches

VLAN Tagging

• Hosts handle VLAN tagging via sub-interfaces
• Format: bond0.<vlan_id> (e.g., bond0.40, bond0.34, bond0.78)
• Switch ports are configured as trunks allowing specific VLANs

IP Addressing

• Static IP configuration on VLAN sub-interfaces
• Subnet assignment based on VLAN ID pattern (e.g., VLAN 40 = 10.40.40.0/24)

Modification

To change host configuration:

1. Edit the appropriate host*_interfaces file
2. Commit changes to git
3. Redeploy the lab: sudo containerlab deploy -t evpn-lab.clab.yml --reconfigure

No need to manually configure hosts after deployment - these files ensure clean, repeatable deployments.

See Also

• HOST_INTERFACE_CONFIGURATION.md - Detailed documentation
• DEPLOYMENT_GUIDE.md - Lab deployment instructions