[f-nsp] Netiron AS4 capabilities

[Jörg Kost]

By the way, it is also wrongly set in the BGP message for the community attribute, which must be a bug in Mtick.

NetIron BGP code is quite stable, I've never had any problems with it in 10 years. The parser has to be careful when validating the attributes, it's all C code, nobody needs a buffer overflow on their BGP router ;-)

On 29 Jun 2023, at 20:28, Jörg Kost wrote:

> Oh thank you, well, I'll throw that naively into the room,
> the extended length flag for the AGGREGATOR must not be set at all, as the length is fixed at = 8.
> Anyone else have an opinion on this? That looks like an error in the Mikrotik code to me.
>
> There was a similar bug with Bird:
> https://bird.network.cz/pipermail/bird-users/2021-March/015312.html
>
> On 29 Jun 2023, at 19:59, Bogdan Rotariu wrote:
>
>> Yes, I did do that so I can filter AS-PATHS, but too many. I just activated again. For not spamming the list too much added just some of the output,, the full output is here: https://pastie.dev/CdnSr8.yaml
>>
>> [29.06.2023, 8:53:34,297 PM] Jun 29 20:53:34.351 BGP: Incoming TCP connection. peer 10.11.1.15 OKed
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: Rcv incoming TCP connection UP. handle a001143a:1b7fadf4, key 0
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 Connection Collision, connection_up=0
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 Accept incoming TCP connection from peer, local IP 10.11.1.4
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 TCP Connection opened
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 sending MultiProtocol cap, afi/safi=1/1, length 4
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 sending 4-octet ASN cap, asn=56430, length 4
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 fbit is 0,  for AFI/SAFI 1/1
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 sending Graceful Restart cap, rbit 0,  time 120, length 6
>> [29.06.2023, 8:53:34,299 PM] Jun 29 20:53:34.352 BGP: 10.11.1.15 sending OPEN, My asn=56430 holdTime=90 route_refresh=1 cooperative= 1, restart 1/0
>> [29.06.2023, 8:53:34,300 PM] Jun 29 20:53:34.355 BGP: 10.11.1.15 rcv OPEN w/Option parameter length 20, My asn 56430, hold_time 180
>> [29.06.2023, 8:53:34,300 PM] Jun 29 20:53:34.355 BGP: 10.11.1.15 rcv OPEN w/Option parameter length 20
>> [29.06.2023, 8:53:34,300 PM] Jun 29 20:53:34.355 BGP: 10.11.1.15 rcv capability 2, len 0
>> [29.06.2023, 8:53:34,300 PM] Jun 29 20:53:34.355 BGP: 10.11.1.15 rcv 4-octet ASN capability 65, len 4, asn=56430,
>> [29.06.2023, 8:53:34,300 PM] Jun 29 20:53:34.355 BGP: 10.11.1.15 rcv MP_EXT capability 1, len 4, afi/safi=1/1
>> [29.06.2023, 8:53:34,300 PM] Jun 29 20:53:34.355  BGP: 10.11.1.15 rcv Graceful  Restart capability 64, len 2, rbit 0, time 0
>> [29.06.2023, 8:53:34,301 PM] Jun 29 20:53:34.357 BGP: 10.11.1.15 Peer went to ESTABLISHED state
>>
>> [29.06.2023, 8:53:35,495 PM] Jun 29 20:53:35.549 BGP: 10.11.1.15 received invalid AGGREGATOR attribute flag (0xd0)
>> [29.06.2023, 8:53:35,495 PM] Jun 29 20:53:35.549 BGP: 10.11.1.15 received invalid AGGREGATOR attribute flag (0xd0)
>> [29.06.2023, 8:53:35,495 PM] Jun 29 20:53:35.549 BGP: 10.11.1.15 sending NOTIFICATION 3/4 (Attribute Flags Error)
>> [29.06.2023, 8:53:35,495 PM] Jun 29 20:53:35.549 BGP: 10.11.1.15 reset due to BGP notification sent
>> [29.06.2023, 8:53:35,496 PM] Jun 29 20:53:35.549 BGP: 10.11.1.15 Closing TCP connection 0x00000002
>> [29.06.2023, 8:53:35,496 PM] Jun 29 20:53:35.550 BGP: 10.11.1.15 BGP connection closed
>> [29.06.2023, 8:53:35,496 PM] Jun 29 20:53:35.550 BGP: 10.11.1.15 Peer went to IDLE state (Attribute Flags Error)
>> [29.06.2023, 8:53:35,496 PM] Jun 29 20:53:35.550 BGP: 10.11.1.15 Peer already in IDLE state, stays in IDLE state.
>> [29.06.2023, 8:53:35,496 PM] Jun 29 20:53:35.550 BGP: Attribute Error: BGP: 10.11.1.15  rcv UPDATE w/attr: Origin=IGP AS_PATH= AS_SEQ(2) 8708 5606 44418 44418 44418 NextHop=10.11.1.15 LOCAL_PREF=100 ATOMIC_AGGREGATE COMMUNITY=8708:100
>> [29.06.2023, 8:53:35,544 PM] Jun 29 20:53:35.600 BGP: 10.11.1.15 RIB_out peer reset  #RIB_out 0 (safi 0)
>>