思科路由器通过EEM调用python脚本向Flask传递参数测试 - Cisco Community

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一.概述

测试思科路由器通过EEM把ospf的up/down的事件以json rpc方式推送到guestshell上面跑的flask,让flask决定下一步如何操作。

二.测试拓扑

备注：

----flask或者bottle也运行在guestshell上面，需要加&以后台方式运行,也可以运行在外面的CentOS8上面。

----测试预期到达的效果：

当CSR1000v与R2之间OSFP的邻居中断后会自动shutdown路由器CSR1000v与R1相连的Gi1口，

当CSR1000v与R2建立OSFP邻居后会自动up路由器CSR1000v与R1相连的Gi1口。

三.CSR1000v配置步骤

路由器R1只是简单的配置接口地址，R2也只是配置了接口和OSPF，因此配置未给出。CSR1000v通过Gi3口上互联网，只有能上互联网，里面的guestshell才能上公网，通过pip安装包。

1.调整cpu个数和内存大小

2配置接口和路由

interface Loopback0

ip address 10.10.10.10 255.255.255.255

interface GigabitEthernet1

ip address 202.100.1.10 255.255.255.0

no shutdown

interface GigabitEthernet2

ip address 10.1.1.10 255.255.255.0

no shutdown

interface GigabitEthernet3

ip address 192.168.10.10 255.255.255.0

no shutdown

ip route 0.0.0.0 0.0.0.0 192.168.10.2

router ospf 1

router-id 10.10.10.10

network 10.1.1.0 0.0.0.255 area 0

3.配置eem

event manager applet ospf_up_rpc

event syslog pattern "LOADING to FULL, Loading Done"

action 1.0 regexp "GigabitEthernet([0-9]+)" "$_syslog_msg" ifname

action 2.0 cli command "enable"

action 3.0 cli command "guestshell run python /home/guestshell/eem_jason_rpc_client_up.py $ifname"

event manager applet ospf_down_rpc

event syslog pattern "from FULL to DOWN"

action 1.0 regexp "GigabitEthernet([0-9]+)" "$_syslog_msg" ifname

action 2.0 cli command "enable"

action 3.0 cli command "guestshell run python /home/guestshell/eem_jason_rpc_client_down.py $ifname"

4.激活Cisco IOx

CSR1000v(config)#iox

*Dec 15 07:57:02.668: %UICFGEXP-6-SERVER_NOTIFIED_START: R0/0: psd: Server iox has been notified to start

CSR1000v#show iox-service

*Dec 15 07:57:47.060: %SYS-5-CONFIG_I: Configured from console by console

Virtual Service Global State and Virtualization Limits:

Infrastructure version : 1.7

Total virtual services installed : 0

Total virtual services activated : 0

Machine types supported : LXC

Machine types disabled : KVM

Maximum VCPUs per virtual service : 0

Resource virtualization limits:

Name Quota Committed Available

--------------------------------------------------------------

system CPU (%) 7 0 7

memory (MB) 1024 0 813

bootflash (MB) 20000 0 6732

IOx Infrastructure Summary:

---------------------------

IOx service (CAF) : Running

IOx service (HA) : Not Running

IOx service (IOxman) : Running

Libvirtd : Running

CSR1000v#

5.配置guestshell

app-hosting appid guestshell

vnic gateway1 virtualportgroup 0 guest-interface 0 guest-ipaddress 20.1.1.1 netmask 255.255.255.0 gateway 20.1.1.254 name-server 114.114.114.114

interface VirtualPortGroup 0

ip add 20.1.1.254 255.255.255.0

ip nat inside

int GigabitEthernet3

ip address 192.168.10.10 255.255.255.0

ip nat outside

ip nat inside source static 20.1.1.1 192.168.10.200

ip route 0.0.0.0 0.0.0.0 192.168.10.2

6.进入guestshell

CSR1000v#guestshell enable 【如果不调大内存的话，可能会停在这个地方一直不动】

Interface will be selected if configured in app-hosting

Please wait for completion

*Dec 15 08:17:00.952: %IOSXE-4-PLATFORM: R0/0: kernel: dev->name [intsvc0]: dev_entry not populatedguestshell installed successfully

Current state is: DEPLOYED

guestshell activated successfully

Current state is: ACTIVATED

guestshell started successfully

Current state is: RUNNING

Guestshell enabled successfully

CSR1000v#guestshell

[guestshell@guestshell ~]$ sudo ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

15: eth0@if16: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000

link/ether 52:54:dd:a2:f4:63 brd ff:ff:ff:ff:ff:ff

inet 20.1.1.1/24 brd 20.1.1.255 scope global eth0

valid_lft forever preferred_lft forever

inet6 fe80::5054:ddff:fea2:f463/64 scope link

valid_lft forever preferred_lft forever

[guestshell@guestshell ~]$ ping 114.114.114.114

PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.

64 bytes from 114.114.114.114: icmp_seq=2 ttl=128 time=33.5 ms

64 bytes from 114.114.114.114: icmp_seq=3 ttl=128 time=52.0 ms

64 bytes from 114.114.114.114: icmp_seq=4 ttl=128 time=33.3 ms

64 bytes from 114.114.114.114: icmp_seq=5 ttl=128 time=36.9 ms

64 bytes from 114.114.114.114: icmp_seq=6 ttl=128 time=33.2 ms

^C

--- 114.114.114.114 ping statistics ---

6 packets transmitted, 5 received, 16% packet loss, time 5006ms

rtt min/avg/max/mdev = 33.287/37.845/52.053/7.239 ms

[guestshell@guestshell ~]$

7.guestshell安装flask和requests并验证

sudo pip install -i http://mirrors.aliyun.com/pypi/simple/ flask --trusted-host mirrors.aliyun.com

sudo pip install -i http://mirrors.aliyun.com/pypi/simple/ requests --trusted-host mirrors.aliyun.com

[guestshell@guestshell ~]$ python

Python 2.7.5 (default, Jun 17 2014, 18:11:42)

[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from flask import Flask, request

>>> from cli import cli

>>> import requests

>>> import sys

>>> exit()

[guestshell@guestshell ~]$

8.guestshell编辑eemflask.py文件，内容如下：

--不能将eemflask.py文件名命名为flask.py，因为需要导入flask包

from flask import Flask, request

app = Flask(__name__)

@app.route('/eem', methods=['POST'])

def router_control():

client_post_data = request.json

if client_post_data:

event = client_post_data.get('event')

event_detail = client_post_data.get('event_detail')

if event == 'ospf' and event_detail == 'ospf down':

if client_post_data.get('interface') == 'GigabitEthernet2':

return {'event': 'ospf', 'cmd': "configure terminal ; interface GigabitEthernet 1 ; shutdown"}

elif event == 'ospf' and event_detail == 'ospf up':

if client_post_data.get('interface') == 'GigabitEthernet2':

return {'event': 'ospf', 'cmd': "configure terminal ; interface GigabitEthernet 1 ; no shutdown"}

else:

return {'error', 'no jason data'}

if __name__ == '__main__':

app.run(host='0.0.0.0', port=8000)

也可以使用bottle，需要通过sudo pip install -i http://mirrors.aliyun.com/pypi/simple/ bottle --trusted-host mirrors.aliyun.com提前安装bottle，
eembottle.py文件内容如下：

from bottle import post, run, request

@post('/eem')

def eem():

client_post_data = request.json

if client_post_data:

event = client_post_data.get('event')

event_detail = client_post_data.get('event_detail')

if event == 'ospf' and event_detail == 'ospf down':

if client_post_data.get('interface') == 'GigabitEthernet2':

return {'event': 'ospf', 'cmd': "configure terminal ; interface GigabitEthernet 1 ; shutdown"}

elif event == 'ospf' and event_detail == 'ospf up':

if client_post_data.get('interface') == 'GigabitEthernet2':

return {'event': 'ospf', 'cmd': "configure terminal ; interface GigabitEthernet 1 ; no shutdown"}

else:

return {'error', 'no jason data'}

run(host="0.0.0.0", port=8000, debug=True)

8.guestshell编辑两个eem调用的request文件
①eem_jason_rpc_client_up.py 内容如下：

import requests

from cli import cli

import sys

r = requests.post('http://20.1.1.1:8000/eem',

json={'event': 'ospf', 'event_detail': 'ospf up', 'interface': sys.argv[1]})

result_cmd = r.json().get('cmd')

output = cli(result_cmd)

print(output)

②eem_jason_rpc_client_down.py 内容如下：

import requests

from cli import cli

import sys

r = requests.post('http://20.1.1.1:8000/eem',

json={'event': 'ospf', 'event_detail': 'ospf down', 'interface': sys.argv[1]})

result_cmd = r.json().get('cmd')

output = cli(result_cmd)

print(output)

9.后台方式运行eemflask.py

[guestshell@guestshell ~]$ python eemflask.py &

四.验证效果

1.在R2上确定ospf邻居关系已经建立

R2#show ip ospf neighbor

Neighbor ID Pri State Dead Time Address Interface

10.10.10.10 1 FULL/BDR 00:00:39 10.1.1.10 Ethernet0/0

R2#

2.R2上shutdown Ethernet0/0接口等待一段时间再no shutdown该接口

3.在csr1000v上面能看到自动shutdown 和no shutdown g1接口的日志

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