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Published 20 hours ago • verified publisher icon fooelisa

ReadTimeout with open()

Open nkhambal opened this issue 1 year ago • 3 comments

I am getting following read timeout exception when I run my script

Processing Host: usgrx107-bbisp-gw1 Traceback (most recent call last): File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/bgp_group_peer_verification_iosxr_native.py", line 164, in cDev.open() File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 176, in open self._enter_xml_mode() File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 239, in _enter_xml_mode self.lock() File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 477, in lock self._execute_rpc(rpc_command) File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 366, in _execute_rpc response = self._send_command(xml_rpc_command, delay_factor=delay_factor) File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 271, in _send_command last_read = self.device.send_command_expect(command, File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/netmiko/base_connection.py", line 1820, in send_command_expect return self.send_command(*args, **kwargs) File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/netmiko/utilities.py", line 592, in wrapper_decorator return func(self, *args, **kwargs) File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/netmiko/base_connection.py", line 1740, in send_command new_data = self.command_echo_read(cmd=cmd, read_timeout=10) File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/netmiko/base_connection.py", line 1452, in command_echo_read new_data = self.read_until_pattern( File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/netmiko/base_connection.py", line 721, in read_until_pattern raise ReadTimeout(msg) netmiko.exceptions.ReadTimeout:

Pattern not detected: '<\?xml\ version="1\.0"\ encoding="UTF\-8"\?><Request\ MajorVersion="1"\ MinorVersion="0"><Lock/></Request>' in output.

Things you might try to fix this:

  1. Adjust the regex pattern to better identify the terminating string. Note, in many situations the pattern is automatically based on the network device's prompt.
  2. Increase the read_timeout to a larger value.

You can also look at the Netmiko session_log or debug log for more information.

Script is pretty simple

devLogFile = str(aHost) + "_session.log"
file = open(devLogFile, "w+")
cDev = IOSXR(hostname=aHost, username=uName, password=uPassWd, port=22, timeout=300, logfile=file)
cDev.open()
cDev.unlock()
cDev.show_bgp_summary()
cDev.close()

here is the netmiko session log

DEBUG:paramiko.transport:starting thread (client mode): 0x3036e7c0
DEBUG:paramiko.transport:Local version/idstring: SSH-2.0-paramiko_3.1.0
DEBUG:paramiko.transport:Remote version/idstring: SSH-2.0-OpenSSH_8.0 PKIX[12.1 FIPS]
INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_8.0)
DEBUG:paramiko.transport:=== Key exchange possibilities ===
DEBUG:paramiko.transport:kex algos: ecdh-sha2-nistp521, ecdh-sha2-nistp384, ecdh-sha2-nistp256, diffie-hellman-group14-sha1, diffie-hellman-group14-sha256, diffie-hellman-group16-sha512
DEBUG:paramiko.transport:server key: ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521, rsa-sha2-256, rsa-sha2-512
DEBUG:paramiko.transport:client encrypt: aes128-ctr, aes192-ctr, aes256-ctr, [email protected], [email protected]
DEBUG:paramiko.transport:server encrypt: aes128-ctr, aes192-ctr, aes256-ctr, [email protected], [email protected]
DEBUG:paramiko.transport:client mac: hmac-sha2-512, hmac-sha2-256, hmac-sha1
DEBUG:paramiko.transport:server mac: hmac-sha2-512, hmac-sha2-256, hmac-sha1
DEBUG:paramiko.transport:client compress: none, [email protected]
DEBUG:paramiko.transport:server compress: none, [email protected]
DEBUG:paramiko.transport:client lang: <none>
DEBUG:paramiko.transport:server lang: <none>
DEBUG:paramiko.transport:kex follows: False
DEBUG:paramiko.transport:=== Key exchange agreements ===
DEBUG:paramiko.transport:Kex: ecdh-sha2-nistp256
DEBUG:paramiko.transport:HostKey: ecdsa-sha2-nistp256
DEBUG:paramiko.transport:Cipher: aes128-ctr
DEBUG:paramiko.transport:MAC: hmac-sha2-256
DEBUG:paramiko.transport:Compression: none
DEBUG:paramiko.transport:=== End of kex handshake ===
DEBUG:paramiko.transport:kex engine KexNistp256 specified hash_algo <built-in function openssl_sha256>
DEBUG:paramiko.transport:Switch to new keys ...
DEBUG:paramiko.transport:Adding ecdsa-sha2-nistp256 host key for usgrx107-bbisp-gw1: b'f0faa56c14fd92601ccec0850fd61707'
DEBUG:paramiko.transport:Got EXT_INFO: {'[email protected]': b'x509v3-ecdsa-sha2-nistp256,x509v3-ecdsa-sha2-nistp384,x509v3-ecdsa-sha2-nistp521,x509v3-ssh-rsa,ssh-rsa', 'server-sig-algs': b'x509v3-ecdsa-sha2-nistp256,x509v3-ecdsa-sha2-nistp384,x509v3-ecdsa-sha2-nistp521,x509v3-ssh-rsa,ssh-rsa'}
DEBUG:paramiko.transport:userauth is OK
INFO:paramiko.transport:Auth banner: b'\n**********************************************************************************\n***                  WARNING - UNAUTHORIZED ACCESS PROHIBITED                  ***\n***  You are attempting to access a system that is part of a private network   ***\n***        Access and use of this system may be monitored and recorded         ***\n***   Unauthorized access and use is strictly prohibited and may be referred   ***\n***                             to law enforcement                             ***\n**********************************************************************************\n*                          CORE SERVICES    AR2022-001                           *\n**********************************************************************************\n\n'
INFO:paramiko.transport:Authentication (password) successful!
DEBUG:paramiko.transport:[chan 0] Max packet in: 32768 bytes
DEBUG:paramiko.transport:Received global request "[email protected]"
DEBUG:paramiko.transport:Rejecting "[email protected]" global request from server.
DEBUG:paramiko.transport:Debug msg: b'AUTH: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding'
DEBUG:paramiko.transport:[chan 0] Max packet out: 32768 bytes
DEBUG:paramiko.transport:Secsh channel 0 opened.
DEBUG:paramiko.transport:[chan 0] Sesch channel 0 request ok
DEBUG:paramiko.transport:[chan 0] Sesch channel 0 request ok
DEBUG:netmiko:write_channel: b'\n'
DEBUG:netmiko:read_channel: Last login: Thu Jun  1 22:03:49 2023 from 17.149.238.241



DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:


DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: RP/0/RP0/CPU0:usgrx107-bbisp-gw1#

RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:Pattern found: ([>#]) Last login: Thu Jun  1 22:03:49 2023 from 17.149.238.241




RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:write_channel: b'terminal width 511\n'
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: terminal width 511

Thu Jun  1 22:12:28.531 UTC

DEBUG:netmiko:Pattern found: (terminal width 511)

RP/0/RP0/CPU0:usgrx107-bbisp-gw1#terminal width 511
DEBUG:netmiko:In disable_paging
DEBUG:netmiko:Command: terminal length 0

DEBUG:netmiko:write_channel: b'terminal length 0\n'
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: terminal length 0

Thu Jun  1 22:12:28.599 UTC

DEBUG:netmiko:Pattern found: (terminal\ length\ 0)

Thu Jun  1 22:12:28.531 UTC
RP/0/RP0/CPU0:usgrx107-bbisp-gw1#terminal length 0
DEBUG:netmiko:

Thu Jun  1 22:12:28.531 UTC
RP/0/RP0/CPU0:usgrx107-bbisp-gw1#terminal length 0
DEBUG:netmiko:Exiting disable_paging
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:Pattern found: ([>#])

Thu Jun  1 22:12:28.599 UTC
RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:read_channel:
DEBUG:netmiko:write_channel: b'\n'
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:

RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:
Parenthesis found in pattern.

pattern: (\#|>)


This can be problemtic when used in read_until_pattern().

You should ensure that you use either non-capture groups i.e. '(?:' or that the
parenthesis completely wrap the pattern '(pattern)'
DEBUG:netmiko:Pattern found: (\#|>)

RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:read_channel:
DEBUG:netmiko:[find_prompt()]: prompt is RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:read_channel:
DEBUG:netmiko:write_channel: b'\n'
DEBUG:netmiko:read_channel:
DEBUG:netmiko:write_channel: b'\n'
DEBUG:netmiko:read_channel:

RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:read_channel:
DEBUG:netmiko:[find_prompt()]: prompt is RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:write_channel: b'xml\n'
DEBUG:netmiko:read_channel:

RP/0/RP0/CPU0:usgrx107-bbisp-gw1#xml

Thu Jun  1 22:12:28.873 UTC

DEBUG:netmiko:read_channel: XML>
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:write_channel: b'<?xml version="1.0" encoding="UTF-8"?><Request MajorVersion="1" MinorVersion="0"><Lock/></Request>\n'
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: <?xml version="1.0" encoding="UTF-8"?>
<Response MajorVersion="1" MinorVersion="0"><Lock/><ResultSummary ErrorCount="0"/></Response>
XML>
DEBUG:netmiko:read_channel:
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nkhambal avatar Jun 01 '23 22:06 nkhambal

Just FYI, cDev.unlock() is something I added to see if thats the issue. But the timeout happens with or without it.

nkhambal avatar Jun 01 '23 22:06 nkhambal

Made some progress. Used lock = False option to avoid locking the config db.

cDev = IOSXR(hostname=aHost, username=uName, password=uPassWd, port=22, timeout=300, lock=False, logfile=file)

changed the _XML_SHELL command to 'xml echo format' (tried 'xml echo' too).

_XML_SHELL = 'xml echo format'

Now I am getting XML parse error

Traceback (most recent call last):
  File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 368, in _execute_rpc
    root = ET.fromstring(str.encode(response))
  File "src/lxml/etree.pyx", line 3257, in lxml.etree.fromstring
  File "src/lxml/parser.pxi", line 1916, in lxml.etree._parseMemoryDocument
  File "src/lxml/parser.pxi", line 1803, in lxml.etree._parseDoc
  File "src/lxml/parser.pxi", line 1144, in lxml.etree._BaseParser._parseDoc
  File "src/lxml/parser.pxi", line 618, in lxml.etree._ParserContext._handleParseResultDoc
  File "src/lxml/parser.pxi", line 728, in lxml.etree._handleParseResult
  File "src/lxml/parser.pxi", line 657, in lxml.etree._raiseParseError
  File "<string>", line 2
lxml.etree.XMLSyntaxError: XML declaration allowed only at the start of the document, line 2, column 6

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/bgp_group_peer_verification_iosxr_native.py", line 169, in <module>
    cDev.show_ip_bgp_vrf_APPLEVRF_summary()
  File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 126, in _getattr
    response = self._execute_show(cmd)
  File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 439, in _execute_show
    response = self._execute_rpc(rpc_command)
  File "/Users/nileshkhambal/Documents/GIT_REPO/PIE/edge-bgp-peer-verification/all-route-verification/venv/lib/python3.9/site-packages/pyIOSXR/iosxr.py", line 372, in _execute_rpc
    raise InvalidXMLResponse('Unable to process the XML Response from the device!', self)
pyIOSXR.exceptions.InvalidXMLResponse: Unable to process the XML Response from the device!

Here is the netmiko session log.

DEBUG:netmiko:Clear buffer detects data in the channel
DEBUG:netmiko:read_channel:
DEBUG:netmiko:[find_prompt()]: prompt is RP/0/RP0/CPU0:usgrx107-bbisp-gw1#
DEBUG:netmiko:write_channel: b'xml echo format\n'
DEBUG:netmiko:read_channel: xml echo format

Fri Jun  2 06:17:11.509 UTC

DEBUG:netmiko:read_channel: XML>
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:write_channel: b'<?xml version="1.0" encoding="UTF-8"?><Request MajorVersion="1" MinorVersion="0"><CLI><Exec>show ip bgp vrf APPLEVRF summary</Exec></CLI></Request>\n'
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
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DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: <?xml version="1.0" encoding="UTF-8"?><Request MajorVersion="1" MinorVersion="0"><CLI><Exec>show ip bgp vrf TESTVRF summary</Exec></CLI></Request>

DEBUG:netmiko:Pattern found: (<\?xml\ version="1\.0"\ encoding="UTF\-8"\?><Request\ MajorVersion="1"\ MinorVersion="0"><CLI><Exec>show\ ip\ bgp\ vrf\ TESTVRF\ summary</Exec></CLI></Request>) <?xml version="1.0" encoding="UTF-8"?><Request MajorVersion="1" MinorVersion="0"><CLI><Exec>show ip bgp vrf TESTVRF summary</Exec></CLI></Request>
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel:
DEBUG:netmiko:read_channel: <?xml version="1.0" encoding="UTF-8"?>
<Response MajorVersion="1" MinorVersion="0">
    <CLI>
        <Exec>

BGP VRF TESTVRF, state: Active
BGP Route Distinguisher: 65535:220020128
VRF ID: 0x60000002
BGP router identifier 10.12.88.111, local AS number 714
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000002   RD version: 422613664
BGP main routing table version 422613664
BGP NSR Initial initsync version 49893 (Reached)
BGP NSR/ISSU Sync-Group versions 422613664/0

BGP is operating in STANDALONE mode.


Process   RcvTblVer       RIBVer/RIBAckVer     LabelVer   ImportVer  SendTblVer  StandbyVer
Speaker   422613664   422613664/422613664     422613664   422613664   422613664   422613664

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
10.0.20.193       0 4217005001 3824455 3818028 422613664    0    0     3w1d        205
10.0.20.195       0 4217005001 3792582 3817752 422613664    0    0     3w1d        205
10.2.208.31       0   714   23106 1069556        0    0    0     3w2d Idle
172.18.36.110     0   714  107067 1150448 422613664    0    0     5w0d          0


        </Exec>
    </CLI>
    <ResultSummary ErrorCount="0"/>
</Response>
XML>

Any ideas?

nkhambal avatar Jun 02 '23 06:06 nkhambal

I printed the response for the CLI. Looks like there are 2 XML declaration at the top. One for request and other for response. It is probably why XML parsing is failing.

<?xml version="1.0" encoding="UTF-8"?><Request MajorVersion="1" MinorVersion="0"><CLI><Exec>show ip bgp vrf TESTVRF summary</Exec></CLI></Request>
<?xml version="1.0" encoding="UTF-8"?>
<Response MajorVersion="1" MinorVersion="0"><CLI><Exec>
BGP VRF TESTVRF, state: Active
BGP Route Distinguisher: 65535:220020128
VRF ID: 0x60000002
BGP router identifier 10.12.88.111, local AS number 714
Non-stop routing is enabled
BGP table state: Active
Table ID: 0xe0000002   RD version: 422613664
BGP main routing table version 422613664
BGP NSR Initial initsync version 49893 (Reached)
BGP NSR/ISSU Sync-Group versions 422613664/0

BGP is operating in STANDALONE mode.


Process   RcvTblVer       RIBVer/RIBAckVer     LabelVer   ImportVer  SendTblVer  StandbyVer
Speaker   422613664   422613664/422613664     422613664   422613664   422613664   422613664

Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd
10.0.20.193       0 4217005001 3829209 3822085 422613664    0    0     3w1d        205
10.0.20.195       0 4217005001 3797336 3821809 422613664    0    0     3w1d        205
10.2.208.31       0   714   23106 1069556        0    0    0     3w2d Idle
172.18.36.110     0   714  107202 1150583 422613664    0    0     5w0d          0

</Exec></CLI><ResultSummary ErrorCount="0"/></Response>

nkhambal avatar Jun 02 '23 07:06 nkhambal