[FROG] frr 5.0.2, remove-private-AS and ebgp multihop

[Don Slice]

Looks broken to me and I don't remember seeing it reported.  File an issue
on it and see if someone picks it up.  If anyone else knows better, feel
free to respond.

On Thu, Feb 28, 2019 at 8:48 AM Chris Malton <chris at deltav-tech.co.uk>
wrote:

> Hi all,
>
> Weird one here:
>
> In my config I have an eBGP Multihop peer, and for some reason, despite
> the config looking like this:
>
> router bgp 65001
>   neighbor w.x.y.z remote-as nnnnn
>   neighbor w.x.y.z local-as 205804
>   neighbor w.x.y.z description Upstream - Peering Router - b
>   neighbor w.x.y.z ebgp-multihop 2
>   neighbor w.x.y.z disable-connected-check
>   neighbor w.x.y.z update-source 81.187.56.158
>   address-family ipv4 unicast
>    neighbor w.x.y.z remove-private-AS all replace-AS
>
> nnnnn is the correct peer ASN.
>
> The resulting PCAP in wireshark shows:
>
> Path Attribute - AS_PATH: 205804 65001
>      Flags: 0x50, Transitive, Extended-Length, Well-known, Complete
>      Type Code: AS_PATH (2)
>      Length: 10
>      AS Path segment: 205804 65001
>          Segment type: AS_SEQUENCE (2)
>          Segment length (number of ASN): 2
>          AS4: 205804
>          AS4: 65001
>
> I am convinced I have done something wrong, as I expected FRR to strip
> 65001 from the sequence.
>
> I'm running frr 5.0.2 on a pfSense (so alas, upgrading to 6 isn't an
> option at the moment).
>
> Any hints what I've done wrong - or is this a known bug?
>
> Regards,
>
> Chris Malton
>
> --
> Delta V Technologies Limited
> 03333 402 402    www.deltav-tech.co.uk
> Office: 17 Elm Close, Southampton, SO16 7DT
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>
>
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-- 
Don Slice
Cumulus Networks
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