[f-nsp] Netiron AS4 capabilities

[Tim Warnock]

From https://datatracker.ietf.org/doc/html/rfc4271#section-9.2.2.2

         g) AGGREGATOR (Type Code 7)

            AGGREGATOR is an optional transitive attribute of length 6.
            The attribute contains the last AS number that formed the
            aggregate route (encoded as 2 octets), followed by the IP
            address of the BGP speaker that formed the aggregate route
            (encoded as 4 octets).  This SHOULD be the same address as
            the one used for the BGP Identifier of the speaker.

            Usage of this attribute is defined in 5.1.7.

I cant easily see anywhere where that definition was extended to support a length of 8 - so this kinda feels like a RouterOS issue rather than the CERs.

Hopefully I have this correct:

0x0064d007 0x00080000
0xad825509 octets - 173 130 85 09 AS21769/AS2910999817 ?
0x1f8617c3  this should be the aggregator IP address 31 129 23 195 ?



-----Original Message-----
From: foundry-nsp <foundry-nsp-bounces at puck.nether.net> On Behalf Of Bogdan-Stefan Rotariu
Sent: Thursday, June 29, 2023 9:45 PM
To: foundry-nsp at puck.nether.net
Subject: [f-nsp] Netiron AS4 capabilities

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
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