BGP Confederation Internal ASN Filtering and is_bogon() Functionality in New BIRD Version

[Brandon Zhi]

Hi there,

I am writing to inquire about the capabilities of the new version of BIRD
regarding BGP Confederation internal ASNs. Specifically, I would like to
know:

1. Can the new BIRD version filter BGP Confederation internal ASNs?
2. Does it support calculating the total AS path length, including internal
ASNs within a BGP Confederation?

Additionally, I have encountered an issue while using the `is_bogon()`
function. It currently filters a route with the AS path (65000) 398741. I
suspect this is because (65000) is being treated as a BOGON ASN.

Below is the `define BOGON_ASNS` I am using:

```plaintext
define BOGON_ASNS = [
    0,                      # RFC 7607
    23456,                  # RFC 4893 AS_TRANS
    64496..64511,           # RFC 5398 and documentation/example ASNs
    64512..65534,           # RFC 6996 Private ASNs
    65535,                  # RFC 7300 Last 16 bit ASN
    65536..65551,           # RFC 5398 and documentation/example ASNs
    65552..131071,          # RFC IANA reserved ASNs
    4200000000..4294967294, # RFC 6996 Private ASNs
    4294967295              # RFC 7300 Last 32 bit ASN
];
```

Best regards,
*Brandon Zhi*
HUIZE LTD
www.huize.asia  <https://huize.asia/>| www.ixp.su | Twitter

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