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/BGPCEP-918 bgpcep <p>When using Cisco router IOS-XR 6.5.x or 7.0.x, as BGP Link State speaker, BGP session crash when decoding unknown Link State TLV.</p> <p>First, LinkAttributesParser warn about valid link attribute (in fact about attribute it is not able to decode). This produce a BGPDocumentedException in bgp-parser. After that, BGP session crashes and ODL attempt to re-open the BGP session. However, the BGP session has not been properly close i.e. the Cisco Router doesn't see that the BGP session close. Thus, in turn to the new BGP Open message, the Router close it with a CEASE=6 reason (which is normal as the router feel that the peer try to re-open an on-going BGP session). After that, ODL enter in a loop where it try to open the BGP session, and the Router to close it with the CEASE=6 reason.</p> <blockquote><p>2020-07-15T19:31:47,720 | WARN  | epollEventLoopGroup-7-1 | LinkAttributesParser             | 215 - org.opendaylight.bgpcep.bgp-linkst<br/> ate - 0.13.1 | TLV 1173 is not a valid link attribute, ignoring it                                                                      <br/> 2020-07-15T19:31:47,989 | ERROR | epollEventLoopGroup-7-1 | BGPDocumentedException           | 223 - org.opendaylight.bgpcep.bgp-parser<br/> -api - 0.13.1 | Error = MALFORMED_ATTR_LIST</p></blockquote> <p><span class="error">&#91;...&#93;</span></p> <blockquote><p>2020-07-15T19:31:58,217 | INFO  | epollEventLoopGroup-7-3 | BGPSessionImpl                   | 229 - org.opendaylight.bgpcep.bgp-rib-im<br/> pl - 0.13.1 | Closing session: BGPSessionImpl</p> <div class="error"><span class="error">Unknown macro: {channel=[id}</span> </div> <p>                                                                                                                                   <br/> 2020-07-15T19:31:58,217 | INFO  | epollEventLoopGroup-7-3 | BGPPeer                          | 229 - org.opendaylight.bgpcep.bgp-rib-im<br/> pl - 0.13.1 | Session with peer 10.194.77.240 terminated: BGPTerminationReason{error=CEASE}                                             <br/> 2020-07-15T19:31:58,218 | INFO  | epollEventLoopGroup-7-3 | BGPPeer                          | 229 - org.opendaylight.bgpcep.bgp-rib-im<br/> pl - 0.13.1 | Closing session with peer</p></blockquote> <p>The only way to stop this behavior is to stop ODL or delete BGP peer.</p> <p>Here, the unknown TLV is a valid one i.e. MSD TLV</p> <p>The expected behavior is to raise only a warning message without the BGPDocumentedException</p> <p>The expected </p> BGPCEP-918

BGP session crash with unknown BGP Link State TLV

Bug High Open Unresolved Ajay Lele Olivier Dugeon Fri, 24 Jul 2020 17:31:28 +0000 Thu, 17 Sep 2020 16:31:02 +0000 0 3 <p><a href="https://jira.opendaylight.org/secure/ViewProfile.jspa?name=odd22" class="user-hover" rel="odd22">odd22</a> can you capture a BGP trace of the conversation?</p> <p>Robert,</p> <p>I just uploaded a whireshark capture and karaf.log as requested.</p> <p>Test has been conducted against a Cisco IOS-XR 6.5.3 (running as VM) advertising through BGP-LS an IS-IS topology with Traffic Engineering, IPv6, Segment Routing and Extended Metrics. ODL uses the IP address 10.194.77.10 and Cisco router 10.194.77.241.</p> <p>In karaf.log, search for "<em>BGPDocumentedException</em>" for the beginning of the problem, where you find that some TLVs are not known and thus handle, but raising an exception instead of just ignoring them. Then, the problem occurs because the exception close the TCP channel without sending a BGP Close message. So, each time ODL attempt to re-establish the BGP session, the Cisco send back a BGP Notification message with Error code Cease (6).</p> <p>Don't hesitate to contact me for more explanation.</p> <p>Regards</p> <p>Olivier</p> Development Rank 0|i03u13: