ksator / underlay-protocols-comparison

This repository provides examples of EOS configuration files for an EVPN-VXLAN fabric using various underlay options

About this repository

This repository provides examples of EOS configuration files for an EVPN-VXLAN fabric using various underlay options:

• EBGP
  • Leaves <-> spines interfaces are configured with an IPv4 address
• RFC5549
  • No IPv4 address configured on leaves <-> spines interfaces
  • IPv6 enabled on leaves <-> spines interfaces
    • IPv6 link-local address is automatically configured
    • The IPv6 link-local address of the remote end is discovered via IPv6’s Neighbor Discovery Router Advertisement protocol
  • EBGP peers address are not configured
    • On leaves, BGP uses the discovered IPv6 link-local address of the remote end (spines)
    • On spines, BGP is configured with listen range
  • IPv4 NLRI advertisement with an IPv6 Next Hop
  • Routing of an IPv4 packet over a IPv6 network
• OSPF
  • Single area
  • Lo0 and Lo1 are passive interfaces
  • Leaves <-> spines interfaces are configured with an IP address
• OSPF_unnumbered
  • Single area
  • Lo0 and Lo1 are passive interfaces
  • Leaves <-> spines interfaces are using Lo0 interface IP address
• ISIS_adv_passive_only
  • Level 1
  • Lo0 and Lo1 are passive interfaces
  • ISIS advertises only passive interfaces (Lo0 and Lo1)
  • Leaves <-> spines interfaces are configured with an IP address
• ISIS_unnumbered
  • Level 1
  • Lo0 and Lo1 are passive interfaces
  • Leaves <-> spines interfaces are using Lo0 interface IP address

This repository also provides various show commands output for each scenario.

Topology details

• 2 spines
  • DC1-SPINE1 and DC1-SPINE2
• 4 L3 leaves
  • MLAG to connect servers on L3 Leaves
    • DC1-LEAF1A and DC1-LEAF1B
    • DC1-LEAF2A and DC1-LEAF2B
  • Distributed routing on L3 Leaves
• EBGP overlay
  • Symmetric IRB
  • Lo0 for BGP peering (overlay)
  • Lo1 for VTEP source address
  • VLAN aware bundle
  • VRFs

Repository usage

Clone the repository:

git clone https://github.com/aristanetworks/ansible-avd.git
git clone https://github.com/ksator/underlay-protocols-comparison.git
cd underlay-protocols-comparison

To get the list of lab:

ls inventories

To print the devices version and model:

ansible-playbook playbooks/print_version_and_model.yml -i inventories/{{ lab }}/inventory.yml

To load a lab configuration on devices:

ls inventories/{{ lab }}/intended/configs
ansible-playbook playbooks/load_intended_config.yml -i inventories/{{ lab }}/inventory.yml

To collect show commands from devices:

ls inventories/{{ lab }}/group_vars/DC1_FABRIC.yml
ansible-playbook playbooks/snapshot.yml -i inventories/{{ lab }}/inventory.yml

ls inventories/{{ lab }}/snapshots

If you would like to update the intended configuration from the devices running configuration:

• Collect the running configuration (using the snapshot.yml playbook)

ansible-playbook playbooks/snapshot.yml -i inventories/{{ lab }}/inventory.yml
more inventories/{{ lab }}/snapshots/{{ inventory_hostname }}/show running-config.txt

• Then use the update_intended_config.yml playbook to copy the collected running configuration from the snapshots directory to the intended directory

ansible-playbook playbooks/update_intended_config.yml -i inventories/{{ lab }}/inventory.yml

ls inventories/{{ lab }}/intended/configs