ansible-ios-prefix-list-route-map

Prefix-lists and route-maps are the main tools for network engineers to control the route advertisements at the core and edge network infrastructure, used by dynamic routing protocols like bgp.

There are defined two roles - ios-prefix-list and ios-route-map, and an example of playbook to apply these prefix-lists and route-maps on Cisco IOS devices, just populating a txt file with prefix-lists content.
The network operators can easily update the prefix-lists and route-maps, without worrying about ansible and yaml syntax.

The role "ios-prefix-list" will read the "prefixlist-name.txt" file content, and create/update a prefix-list in the target device(s) defined in the playbook. The role "ios-route-map" will apply the prefix-list in the route-map name defined.

After apply the prefix-list and associate this to the route-map, a debug command returns the prefix-list content applied and the route-map configuration output.

Example:

TASK [ios-prefix-list : update prefix-list prefix-list-test] ******************************************
changed: [x.x.x.x]

TASK [ios-prefix-list : show prefix-list prefix-list-test] ********************************************
ok: [x.x.x.x]

TASK [ios-prefix-list : debug] ************************************************************************
ok: [    "prefixlistout.stdout_lines": [
        [
            "ip prefix-list prefix-list-test: 2 entries", 
            "   seq 10 permit 10.0.0.0/24", 
            "   seq 20 permit 10.10.0.0/16 le 24"
        ]
    ]
}

TASK [ios-route-map : update route-map route-map-test with prefix-list prefix-list-test] **************
changed: [x.x.x.x]

TASK [ios-route-map : show route-map route-map-test] **************************************************
ok: [x.x.x.x]

TASK [ios-route-map : debug] **************************************************************************
ok: [x.x.x.x] => {
    "routemapout.stdout_lines": [
        [
            "route-map route-map-test, permit, sequence 10", 
            "  Match clauses:", 
            "    ip address prefix-lists: prefix-list-test ", 
            "  Set clauses:", 
            "  Policy routing matches: 0 packets, 0 bytes"
        ]
    ]
}

Variables

You must define the variables "prefixlist_name" and "routemap_name" in the playbook.

prefixlist_name: "name-of-prefix-list-in-the-device-config"
routemap_name: "name-of-route-map-in-the-device-config"

Example:

prefixlist_name: prefix-list-test
routemap_name: route-map-test

This is to create/update a prefix-list named "prefix-list-test" with "prefix-list-test.txt" file content, and apply this prefix-list to the route-map "route-map-test".

Running Playbooks:

$ ansible-playbook -i hosts playbook.yaml --ask-pass

You can create/update more than one prefix-lists and route-maps in the same device(s), just replicating the task content and changing the variables. You need also to create the respective files "prefix-list-name.txt" with prefix-list content.

Example:

   - name: update other prefix-list "{{ prefixlist_name }}"
    vars:
      prefixlist_name: prefix-list-test-2
    import_role:
      name: ios-prefix-list

  - name: apply other prefix-list "{{ prefixlist_name }}" on other route-map "{{ routemap_name }}"
    vars:
      prefixlist_name: prefix-list-test-2
      routemap_name: route-map-test-2
    import_role:
      name: ios-route-map

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