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

[Chris Malton]

Thanks Don - reported at https://github.com/FRRouting/frr/issues/3891

Regards,

Chris

On 28/02/2019 19:58, Don Slice wrote:
> 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 
> <mailto: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 <http://www.deltav-tech.co.uk>
>     Office: 17 Elm Close, Southampton, SO16 7DT
>     Company No. 11006104 Registered in England and Wales
>
>
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>
>
> -- 
> Don Slice
> Cumulus Networks

-- 
Delta V Technologies Limited
03333 402 402    www.deltav-tech.co.uk
Office: 17 Elm Close, Southampton, SO16 7DT
Company No. 11006104 Registered in England and Wales

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