https://jira.opendaylight.org This file is an XML representation of an issue en-us 8.20.10 820010 22-06-2022 https://jira.opendaylight.org/browse/CONTROLLER-1220 controller <p>Cisco routers expect that NETCONF messages are prefixed by the XML declaration:</p> <p> &lt;?xml version="1.0" encoding="UTF-8"?&gt;</p> <p>Else, they close the NETCONF/SSH connection and log an error such as:</p> <p> NETCONF-ERROR: parse error before hello seen</p> <p>NETCONF messages sent by the OpenDaylight controller (eg the &lt;hello&gt; message) are not prefixed with that XML declaration. Consequently, Cisco routers reject them and close the NETCONF/SSH connection.</p> <p>This has been observed with the follwoing Cisco equipments and IOS versions:</p> <ul> <li>CSR1000V (virtual routeur) with IOS 15.4(1)S</li> <li>ASR1001-X with IOS 15.4(2)S0a</li> <li>ISR2900 with IOS 15.1(4)M1</li> </ul> <p>A test program that can be used to reproduce the problem with a Cisco router can be found in the related bug report: <a href="https://bugs.opendaylight.org/show_bug.cgi?id=2877" class="external-link" target="_blank" rel="nofollow noopener">https://bugs.opendaylight.org/show_bug.cgi?id=2877</a>.</p> <p>Whether the NETCONF RFC mandates the presence of the XML declaration is unclear to me. So I don't know if this is a bug in OpenDaylight or a bug in Cisco routers.</p> <p>I will propose a patch to fix/workaround the problem in OpenDaylight.</p> <p>Operating System: All<br/> Platform: All</p> CONTROLLER-1220

NETCONF messages sent by OpenDaylight cannot be parsed by Cisco routers

Bug Resolved Done Gwenael Lambrouin Gwenael Lambrouin Fri, 20 Mar 2015 10:52:01 +0000 Tue, 25 Jul 2023 08:23:58 +0000 Mon, 23 Mar 2015 11:49:26 +0000 netconf 0 1 <p>This could be easily changed in ThreadLocalTransformers class setting the OMIT_XML_DECLARATION attribute to no. However, we need to be sure this will not break compatibility with other Netconf devices after the xml declaration is added.</p> <p>Looking into RFC 6241:</p> <p>A NETCONF message MAY begin with an XML declaration (see Section 2.8<br/> of <span class="error">&#91;W3C.REC-xml-20001006&#93;</span>).</p> <p>Id say that the xml declaration should not be required.</p> <p>Thanks for your clarification with your pointer to RFC 6241.</p> <p>The code modification you suggest effectively fixes this particular issue with Cisco routers.</p> <p>I submitted a patch for review here:<br/> <a href="https://git.opendaylight.org/gerrit/#/c/16919/" class="external-link" target="_blank" rel="nofollow noopener">https://git.opendaylight.org/gerrit/#/c/16919/</a></p> <p>Changed stat to waiting for review since the patch is available.</p> <p>I will try to just manually test(next week) this just to make sure we do not break inter-operability with something else with this.</p> <p>Please take bugs if you work on them (so we can keep track of the bugs). I assigned it to you for you this time. Thanks</p> <p>Change has been merged into master.</p> Development External issue ID 2878 External issue URL ODL SR Target Milestone Rank 0|i02p87: