借助Ansible捕获Dell交换机VLAN标签信息的问题求助

问题背景 #

我是Ansible新手，需要捕获Dell交换机命令输出并整理为指定格式的字典：
执行命令：

show interfaces switchport | find Name: | except 802.1QTagged: | except Vlan

命令输出示例：

Name: GigabitEthernet 1/1
U       1641
T       1007,1076




Name: GigabitEthernet 1/2
U       1641
T       1007,1076




Name: GigabitEthernet 1/3
U       1641
T       1007,1076

目标：将输出整理为字典，以接口名为键，对应值包含untagged（对应U行内容）和tagged（对应T行内容）。

原Playbook及问题 #

原Playbook代码：

---
- hosts: [dellos9]
  connection: network_cli
  gather_facts: no

  tasks:
  - name: Include secrets and vars
    include_vars: dell_vars.yml

  - name: "Get Dell EMC OS9 VLAN info"
    dellos9_command:
      commands:
        - 'show interfaces switchport | find Name: | except 802.1QTagged: | except Vlan'
    register: switchport_output

  - name: Parsing Command_9 output
    set_fact:
      output_items: "{{  switchport_output.stdout_lines[0] | map('regex_findall','[\\S]+') | list | select() }}"
    when:  switchport_output.stdout_lines is defined

  - name: Process output_items and set variables
    set_fact:
      my_int: "{{ item.1 + ' ' + item.2 if item.0 == 'Name:' }}"
      my_untagged: "{{ item.1 if item.0 == 'U' }}"
      my_tagged: "{{ item.1 if item.0 == 'T' }}"
    loop: "{{ output_items }}"

  - name: Display interface details
    debug:
      msg: "Interface: {{ my_int }} Untagged: {{ my_untagged }} Tagged: {{ my_tagged }}"

运行后输出：

ok: [switch] => (item=['Name:', 'GigabitEthernet', '1/1'])
ok: [switch] => (item=['U', '1641'])
ok: [switch] => (item=['T', '1007,1076'])
ok: [switch] => (item=['Name:', 'GigabitEthernet', '1/2'])
ok: [switch] => (item=['U', '1641'])
ok: [switch] => (item=['T', '1007,1076'])
ok: [switch] => (item=['Name:', 'GigabitEthernet', '1/3'])
ok: [switch] => (item=['U', '1641'])
ok: [switch] => (item=['T', '1007,1076'])
TASK [Display interface details] **********************************************************************************************************************************
ok: [switch] => {
    "msg": "Interface:  Untagged:  Tagged: 1007,1076"
}

问题：循环中set_fact会持续覆盖变量，导致最后仅保留最后一次循环的结果，无法收集所有接口的对应信息。

解决方案 #

通过按接口分组处理，避免变量覆盖，逐步构建目标字典：

修改后的Playbook：

---
- hosts: [dellos9]
  connection: network_cli
  gather_facts: no

  tasks:
  - name: Include secrets and vars
    include_vars: dell_vars.yml

  - name: "Get Dell EMC OS9 VLAN info"
    dellos9_command:
      commands:
        - 'show interfaces switchport | find Name: | except 802.1QTagged: | except Vlan'
    register: switchport_output

  - name: Parse output into interface groups
    set_fact:
      interface_groups: "{{ switchport_output.stdout[0] | split('\n\n\n\n') | map('trim') | select() | list }}"

  - name: Build interface VLAN dictionary
    set_fact:
      interface_vlans: "{{ interface_vlans | default({}) | combine({ intf_name: {'untagged': untagged_vlan, 'tagged': tagged_vlans} }) }}"
    loop: "{{ interface_groups }}"
    vars:
      lines: "{{ item.split('\n') | map('trim') | select() | list }}"
      intf_name: "{{ lines[0].split('Name: ')[1] }}"
      untagged_vlan: "{{ lines[1].split()[1] }}"
      tagged_vlans: "{{ lines[2].split()[1] }}"

  - name: Display interface VLAN details
    debug:
      var: interface_vlans

关键逻辑说明 #

1. 接口块分组：用split('\n\n\n\n')将原始输出按空行分割为单个接口的独立信息块，过滤掉空内容。
2. 单接口信息提取：对每个接口块拆分每行内容，直接提取接口名、untagged VLAN、tagged VLAN列表。
3. 字典构建：通过combine方法逐步将每个接口的信息合并到interface_vlans字典中，避免变量被覆盖。

运行后将得到符合需求的字典结构：

{
    "GigabitEthernet 1/1": {
        "untagged": "1641",
        "tagged": "1007,1076"
    },
    "GigabitEthernet 1/2": {
        "untagged": "1641",
        "tagged": "1007,1076"
    },
    "GigabitEthernet 1/3": {
        "untagged": "1641",
        "tagged": "1007,1076"
    }
}

内容的提问来源于stack exchange，提问作者NetMan