NXOS-Show_Interfaces not finding Vlan Interfaces when additional interfaces are past the config. Also potential to provide wrong information.

[jvanderaa]

ISSUE TYPE

• Bug Report

TEMPLATE USING

Value Required INTERFACE (\S+)
Value LINK_STATUS (\w+)
Value ADMIN_STATE (\S+)
Value HARDWARE_TYPE (.*)
Value ADDRESS ([a-zA-Z0-9]+.[a-zA-Z0-9]+.[a-zA-Z0-9]+)
Value BIA ([a-zA-Z0-9]+.[a-zA-Z0-9]+.[a-zA-Z0-9]+)
Value DESCRIPTION (.*)
Value IP_ADDRESS (\d+\.\d+\.\d+\.\d+\/\d+)
Value MTU (\d+)
Value DUPLEX (.+duplex?)
Value SPEED (.+?)
Value BANDWIDTH (\d+\s+\w+)
Value DELAY (\d+\s+\w+)
Value ENCAPSULATION (\w+)

Start
  ^${INTERFACE}\s+is\s+${LINK_STATUS}
  ^admin\s+state\s+is\s+${ADMIN_STATE},
  ^\s+Hardware(:|\s+is)\s+${HARDWARE_TYPE},\s+address(:|\s+is)\s+${ADDRESS}(.*bia\s+${BIA})*
  ^\s+Description:\s+${DESCRIPTION}
  ^\s+Internet\s+Address\s+is\s+${IP_ADDRESS}
  ^\s+${DUPLEX}, ${SPEED}(,|$$)
  ^\s+MTU\s+${MTU}.*BW\s+${BANDWIDTH}.*DLY\s+${DELAY}
  ^\s+Encapsulation\s+${ENCAPSULATION}
  ^\s+Last -> Record
  ^\s+Rx -> Record

SAMPLE COMMAND OUTPUT

Vlan1 is down (Administratively down), line protocol is down
  Hardware is EtherSVI, address is  00de.fb01.c9bc
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

Vlan330 is up, line protocol is up
  Hardware is EtherSVI, address is  00de.fb01.c921
  Internet Address is 192.168.1.3/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

Vlan336 is up, line protocol is up
  Hardware is EtherSVI, address is  00de.fb01.c933
  Internet Address is 192.168.2.3/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

Vlan339 is up, line protocol is up
  Hardware is EtherSVI, address is  00de.fb01.c9ab
  Internet Address is 192.168.3.3/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

Vlan300 is up, line protocol is up
  Hardware is EtherSVI, address is  00de.fb01.c9ef
  Internet Address is 192.168.24.1/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec

Ethernet106/1/1 is down (Link not connected)
  Hardware: 10/100/1000 Ethernet, address: 0000.d200.0000 (bia 0000.d200.0000)
  MTU 1500 bytes, BW 23 Kbit, DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA
  Port mode is access
  auto-duplex, auto-speed
  Beacon is turned off
  Input flow-control is off, output flow-control is on
  Switchport monitor is off 
  EtherType is 0x8100 
  Last link flapped 14week(s) 5day(s)
  Last clearing of "show interface" counters never
  9 interface resets
  30 seconds input rate 0 bits/sec, 0 packets/sec
  30 seconds output rate 0 bits/sec, 0 packets/sec
  Load-Interval #2: 5 minute (300 seconds)
    input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
  RX
    18476 unicast packets  506094 multicast packets  362760 broadcast packets
    887330 input packets  70500074 bytes
    2 jumbo packets  0 storm suppression bytes
    0 runts  0 giants  0 CRC  0 no buffer
    0 input error  0 short frame  0 overrun   0 underrun  0 ignored
    0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop
    0 input with dribble  0 input discard
    0 Rx pause
  TX
    17841 unicast packets  5660600 multicast packets  339717 broadcast packets
    6018158 output packets  711823811 bytes
    0 jumbo packets
    0 output error  0 collision  0 deferred  0 late collision
    0 lost carrier  0 no carrier  0 babble 0 output discard
    0 Tx pause

SUMMARY

When the VLAN interface on show interfaces is in the middle of a section, TextFSM does not detect the VLAN interface. When it does pick up the VLAN interface is when the VLAN is the last item in the list.

Also just noticed, that with the sample provided above that the ip address detected and assigned to the physical interface was the VLAN IP address.

{'address': '0041.d23f.b4d1',
'admin_state': '',
'bandwidth': '23 Kbit',
'bia': '0041.d23f.b4d1',
'delay': '10 usec',
'description': '',
'duplex': 'auto-duplex',
'encapsulation': 'ARPA',
'hardware_type': '10/100/1000 Ethernet',
'interface': 'Ethernet106/1/48',
'ip_address': '',
'link_status': 'down',
'mtu': '1500',
'speed': 'auto-speed'}

STEPS TO REPRODUCE

Ran the information pasted above through a textfsm parser as referenced in the Netmiko slack channel.

Originally I had developed a script to add IP addresses to Netbox that was not populating the Vlan information, and found that the template was not finding the Vlan information unless the Vlan was the last interface.

import textfsm
import pprint

input_file = open("tests//cisco_nxos//cisco_nxos_show_interface.raw")
raw_text_data = input_file.read()
input_file.close()

fsm_template = open('cisco_nxos_show_interface.template')
fsm_table = textfsm.TextFSM(fsm_template)
fsm_results = fsm_table.ParseText(raw_text_data)

with open('data.yml', 'w') as outfile:
    for row in fsm_results:
        temp_dict = {}
        
        for index, element in enumerate(row):
            temp_dict[fsm_table.header[index].lower()] = element
        
        print '\n'
        pprint.pprint(temp_dict)

EXPECTED RESULTS

I expected to see outputs for 5 VLAN interfaces.

ACTUAL RESULTS

There are no VLANs and the VLAN IP address is assigned to the first physical interface after the VLANs in the output.

{'address': '0000.d200.0000',
 'admin_state': '',
 'bandwidth': '23 Kbit',
 'bia': '0000.d200.0000',
 'delay': '10 usec',
 'description': '',
 'duplex': 'auto-duplex',
 'encapsulation': 'ARPA',
 'hardware_type': '10/100/1000 Ethernet',
 'interface': 'Ethernet106/1/1',
 'ip_address': '192.168.24.1/24',
 'link_status': 'down',
 'mtu': '1500',
 'speed': 'auto-speed'}


{'address': '0041.d23f.b4d1',
 'admin_state': '',
 'bandwidth': '23 Kbit',
 'bia': '0041.d23f.b4d1',
 'delay': '10 usec',
 'description': '',
 'duplex': 'auto-duplex',
 'encapsulation': 'ARPA',
 'hardware_type': '10/100/1000 Ethernet',
 'interface': 'Ethernet106/1/48',
 'ip_address': '',
 'link_status': 'down',
 'mtu': '1500',
 'speed': 'auto-speed'}

[itdependsnetworks]

@vanderaaj can you confirm that #140 fixed this?

[jvanderaa]

Yes it did. I believe everything is all set to go.