BGP hostname / domainname

[SwimGeek]

Hi

Running FRR 10.1.1

I'm trying to figure out how I get BGP to send a hostname and_domain name to the peers around it. Currently it seems only hostname is sent.

Looking at: https://docs.frrouting.org/en/latest/bgp.html it mentions:

hostname bgp-new.example.com

Here hostname is in FQDN format.

I tried adding 'hostname' and 'domainname' to vtysh.conf

I tried adding hostname to bgpd.conf

vtysh seems to strip the domain and only keep the hostname part when you enter FQDN

How do I configure a router to send router-name.domain-name to peers?

[ton31337]

It's a bit unusual with a hostname and domainname. It's recommended to set the whole system correctly, e.g. on Linux:

sudo hostnamectl set-hostname frr.example.org
sudo domainname example.org

[SwimGeek]

Hi,

on the OS level (Linux), the hostname and domain name are correct.

at a local internet exchange, I can see a few peers sending router hostname.domainname when using: 'show bgp ipv4 summary wide'

I'd like to also send hostname and domain name

[ton31337]

Could you show domainname, and hostname from the Linux commands?

[SwimGeek]

Hi

Running Debian 12.

It looks like the 'domainname' command is used for NIS / YP domain name - which probably nobody uses anymore.

The 'dnsdomainname' command returns the correct value, and I think it comes from /etc/hosts

Should FRR maybe use dnsdomainname to work out the domain?

I found some docs saying the NIS domain can be set using /etc/defaultdomain - but that also did not work.

...

root@deb12 ~ # domainname
(none)

root@deb12 ~ # nisdomainname
nisdomainname: Local domain name not set

root@deb12 ~ # ypdomainname
ypdomainname: Local domain name not set

root@deb12 ~ # dnsdomainname
atomic.ac

root@deb12 ~ # cat /etc/defaultdomain
atomic.ac

root@deb12 ~ # cat /etc/debian_version
12.7

[SwimGeek]

Hi @ton31337 do you think it makes sense to open an issue / bug report?

Without the nis/yp domain set, I can't configure the domainname statement in frr.conf