Hello Bogdan, According to https://www.rfc-editor.org/rfc/rfc4271.html,
"the AGGREGATOR is an attribute of length 6", not 8. According to https://www.rfc-editor.org/rfc/rfc6793.html, "the AS4_AGGREGATOR attribute in an UPDATE message SHALL be considered malformed if the attribute length is not 8". I think it looks like a bug in the Mikrotik BGP code that tries to encode AS4 in an AS attribute. BR Jörg On 29 Jun 2023, at 13:44, Bogdan-Stefan Rotariu wrote: > Hi there, > > We have some CER2024 in our network, and we are starting to encounter issues > when receiving prefixes from Mikrotik CCR2216 that is running with ROSv7. Has > anyone any ideea except replacing the CER’s? > > The peer is has AS4 capability negociated: > > Neighbor AS4 Capability Negotiation: > Peer Negotiated AS4 capability > Peer configured for AS4 capability > > We are running version 6.3.0.fT183: > > IronWare : Version 6.3.0fT183 Copyright (c) 2017-2019 Extreme Networks, Inc. > Compiled on Jul 14 2022 at 21:38:40 labeled as ce06300f > (18589108 bytes) from Primary > > last-packet-with-error decode shows : > > Received Message Length: 94 > BGP Message: > 0xffffffff 0xffffffff 0xffffffff 0xffffffff 0x005e0200 > 0x00004340 0x01010050 0x02001602 0x05000022 0x04000015 > 0xe60000ad 0x820000ad 0x820000ad 0x82400304 0x0a0b010f > 0x40050400 0x00006440 0x0600d008 0x00042204 0x0064d007 > 0x00080000 0xad825509 0x1f8617c3 0xd204 > > BGP Header > Marker: 0xffffffff 0xffffffff 0xffffffff 0xffffffff > Message Length: (0x005e) 94 > Message Type: (0x02) UPDATE > > UPDATE Message > Unfeasible route length: (0x0000) 0 > Update path attributes > Total Path Attribute length: (0x0043) 67 > Flags : (0x40) Well Known, Transitive, Complete > Type : (0x01) Origin > Length: (0x01) 1 > Origin: (0x00) IGP > > Flags : (0x50) Well Known, Transitive, Complete, Extended length > Type : (0x02) AS Path > Length: (0x0016) 22 > Segment Type : (0x02) AS Sequence > Segment Length: (0x05) 5 > AS Numbers : (0x0000) 0, (0x2204) 8708, (0x0000) 0, (0x15e6) 5606, > (0x0000) 0, > Segment Type : (0xad) Unknown(173) > Segment Length: (0x82) 130 > AS Numbers : (0x0000) 0, (0xad82) 44418, (0x0000) 0, (0xad82) 44418, > > Flags : (0x40) Well Known, Transitive, Complete > Type : (0x03) Next Hop > Length: (0x04) 4 > Next Hop IP address: (0x0a0b010f) 10.11.1.15 > > Flags : (0x40) Well Known, Transitive, Complete > Type : (0x05) Local Preference > Length: (0x04) 4 > Local Preference: (0x00000064) 100 > > Flags : (0x40) Well Known, Transitive, Complete > Type : (0x06) Atomic Aggregate > Length: (0x00) 0 > > Flags : (0xd0) Optional, Transitive, Complete, Extended length > Type : (0x08) Community > Length: (0x0004) 4 > Community List: (0x22040064) 8708:100 > > Flags : (0xd0) Optional, Transitive, Complete, Extended length > Type : (0x07) Aggregator > Length: (0x0008) 8 > Error: Invalid AGGREGATOR attribute length 8 > _______________________________________________ > foundry-nsp mailing list > [email protected] > http://puck.nether.net/mailman/listinfo/foundry-nsp _______________________________________________ foundry-nsp mailing list [email protected] http://puck.nether.net/mailman/listinfo/foundry-nsp
