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Damien Arnodo 2941a95d63 Fix broken links in hosts/README.md

Replace references to non-existent docs with actual files.
Refs #15

2025-11-30 15:40:00 +00:00

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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:

Edit the appropriate host*_interfaces file
Commit changes to git
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.

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