[FROG] What's this 'interface' mean in 'neighbor' configure node ?

[Manuel Schweizer]

Hey Simon

There is very little documentation in FRR about this feature. You can find it here:

http://docs.frrouting.org/en/latest/bgp.html#configuring-peers

> When you connect to a BGP peer over an IPv6 link-local address, you have to specify the IFNAME of the interface used for the connection. To specify IPv4 session addresses, see the neighbor PEER update-source command below.
> This command is deprecated and may be removed in a future release. Its use should be avoided.

Please note that this feature is used for BGP unnumbered and was probably introduced by the developers working at Cumulus Networks. You can find the corresponding documentation of this feature here:

https://docs.cumulusnetworks.com/cumulus-linux/Layer-3/Border-Gateway-Protocol-BGP/#bgp-unnumbered-interfaces

I hope that helps.

Cheers,
Manuel

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Manuel Schweizer

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> On 9 Aug 2019, at 05:10, Simon Jones <batmanustc at gmail.com> wrote:
> 
> Hi all,
> 
> I found this is new in FRR compared to QUAGGA, what's this used for ? Why I should config interface first ? Is there some DOC about this ?
> 
> # neighbor 1.1.1.1/24
> ...
>   interface                  Enable BGP on interface
> 
> # neighbor 1.1.1.1/24 remote-as 5001
> % Create the peer-group or interface first or specify "interface" keyword
> % if using an unnumbered interface neighbor 
> 
> ----
> Simon Jones
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