Simplify netlab Topologies with Link Groups « ipSpace.net site

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Previous month I described how you can simplify your VLAN- or VRF lab topologies with VRF- and VLAN back links, quickly setting vlan.accessibility or vrf attribute on a established of links. Hyperlink groups let you to do the exact same for any established of website link characteristics.

Sample Topology

Visualize you have a modest community with three PE-routers linked to a central P-router:

As prolonged as you are Okay with the default parameters (default OSPF price, default IPv4 handle pool), you could describe that lab with a pretty easy topology file:

defaults.unit: eos
module: [ ospf ]
nodes: [ pe1, pe2, pe3, p ]
inbound links: [ pe1-p, pe2-p, pe3-p ]

Now let’s suppose that you’d like to use unnumbered core hyperlinks, established OSPF price tag on individuals hyperlinks, and established hyperlink part to main. You can no longer use the basic checklist of one-way links but have to define url attributes on each individual solitary connection. Not only is the topology file more durable to examine, it also has copy characteristics^.

defaults.unit: eos
module: [ ospf ]
nodes: [ pe1, pe2, pe3, p ]
back links:
- pe1:
  p:
  unnumbered: true
  ospf.expense: 100
  role: core
- pe2:
  p:
  unnumbered: real
  ospf.charge: 100
  function: main
- pe3:
  p:
  unnumbered: correct
  ospf.price tag: 100
  position: core

Website link Groups to the Rescue

netlab launch 1.5.1 introduced link teams – a basic way to set the exact same set of attributes on numerous inbound links.

Hyperlink groups are outlined within the hyperlinks checklist all you have to do is to established the team attribute to explain to netlab it is working with a group of backlinks, and outline member backlinks in the users attribute.

Utilizing a core team, we can get our lab topology again into an simple-to-browse pretty much-non-redundant structure:

defaults.system: eos
module: [ ospf ]
nodes: [ pe1, pe2, pe3, p ]
hyperlinks:
- group: main
  unnumbered: accurate
  ospf.expense: 100
  job: main
  members: [ pe1-p, pe2-p, pe3-p ]

Guiding the Scenes

Just before beginning the topology information transformation approach, netlab expands link groups into unique backlinks:

A new website link knowledge framework is established for each member link, expanding many simplified website link definition formats into dictionaries.
Team characteristics^{are extra to the website link attribute. Url characteristics (if specified) get precedence about group characteristics.}

Working with this procedure, netlab created the pursuing set of inbound links from the over topology file:

Main hyperlinks developed from the core url group

$ netlab produce -o yaml:one-way links
- interfaces:
  - ifindex: 1
    ifname: Ethernet1
    ipv4: correct
    node: pe1
  - ifindex: 1
    ifname: Ethernet1
    ipv4: legitimate
    node: p
  linkindex: 1
  node_rely: 2
  ospf:
    expense: 100
  part: core
  style: p2p
  unnumbered: genuine
- interfaces:
  - ifindex: 1
    ifname: Ethernet1
    ipv4: true
    node: pe2
  - ifindex: 2
    ifname: Ethernet2
    ipv4: correct
    node: p
  linkindex: 2
  node_count: 2
  ospf:
    charge: 100
  role: core
  type: p2p
  unnumbered: correct
- interfaces:
  - ifindex: 1
    ifname: Ethernet1
    ipv4: legitimate
    node: pe3
  - ifindex: 3
    ifname: Ethernet3
    ipv4: real
    node: p
  linkindex: 3
  node_rely: 2
  ospf:
    cost: 100
  part: main
  kind: p2p
  unnumbered: accurate