This will result in an IPv4 and IPv6 routable mesh network that can survive any one node failure or any one cable failure. Alls the steps in this section must be performed on each node
Note for ceph do not dual stack - either use IPv4 or IPv6 addressees for all the monitors, MDS and daemons - despite the docs implying it is ok my findings on quincy are is it is funky....
this gist is part of this series
Doing this means we don't have to give each thunderbolt a manual IPv6 or IPv4 addrees and that these addresses stay constant no matter what.
Add the following to each node using nano /etc/network/interfaces
This should go uder the auto lo section and for each node the X should be 1, 2 or depending on the node
auto lo:0
iface lo:0 inet static
address 10.0.0.8X/32
auto lo:6
iface lo:6 inet static
address fc00::8X/128
so on the first node it would look comething like this:
...
auto lo
iface lo inet loopback
auto lo:0
iface lo:0 inet static
address 10.0.0.81/32
auto lo:6
iface lo:6 inet static
address fc00::81/128
...
also add this is as the last line to the interfaces file
# This must be the last line in the file
post-up /usr/bin/systemctl restart frr.service
Save file, repeat on each node.
- use
nano /etc/sysctl.confto open the file - uncomment
#net.ipv6.conf.all.forwarding=1(remove the # symbol) - uncomment
#net.ipv4.ip_forward=1(remove the # symbol) - save the file
- reboot?
Install Free Range Routing (FRR) apt install frr
- edit the frr daemons file (
nano /etc/frr/daemons) to changefabricd=notofabricd=yes - save the file
- restart the service with
systemctl restart frr
- enter the FRR shell with
vtysh - optionally show the current config with
show running-config - enter the configure mode with
configure - Apply the bellow configuration (it is possible to cut and paste this into the shell instead of typing it manually, you may need to press return to set the last !. Also check there were no errors in repsonse to the paste text.).
Note: the X should be the number of the node you are working on, as an example - 0.0.0.1, 0.0.0.2 or 0.0.0.3.
ip forwarding
ipv6 forwarding
!
interface en05
ip router openfabric 1
ipv6 router openfabric 1
exit
!
interface en06
ip router openfabric 1
ipv6 router openfabric 1
exit
!
interface lo
ip router openfabric 1
ipv6 router openfabric 1
openfabric passive
exit
!
router openfabric 1
net 49.0000.0000.000X.00
exit
!
-
you may need to pres return after the last
!to get to a new line - if so do this -
exit the configure mode with the command
end -
save the configu with
write memory -
show the configure applied correctly with
show running-config- note the order of the items will be different to how you entered them and thats ok. (If you made a mistake i found the easiest way was to edt/etc/frr/frr.conf- but be careful if you do that.) -
use the command
exitto leave setup -
repeat steps 1 to 9 on the other 3 nodes
-
once you have configured all 3 nodes issue the command
vtysh -c "show openfabric topology"if you did everything right you will see:
Area 1:
IS-IS paths to level-2 routers that speak IP
Vertex Type Metric Next-Hop Interface Parent
pve1
10.0.0.81/32 IP internal 0 pve1(4)
pve2 TE-IS 10 pve2 en06 pve1(4)
pve3 TE-IS 10 pve3 en05 pve1(4)
10.0.0.82/32 IP TE 20 pve2 en06 pve2(4)
10.0.0.83/32 IP TE 20 pve3 en05 pve3(4)
IS-IS paths to level-2 routers that speak IPv6
Vertex Type Metric Next-Hop Interface Parent
pve1
fc00::81/128 IP6 internal 0 pve1(4)
pve2 TE-IS 10 pve2 en06 pve1(4)
pve3 TE-IS 10 pve3 en05 pve1(4)
fc00::82/128 IP6 internal 20 pve2 en06 pve2(4)
fc00::83/128 IP6 internal 20 pve3 en05 pve3(4)
IS-IS paths to level-2 routers with hop-by-hop metric
Vertex Type Metric Next-Hop Interface Parent
Now you should be in a place to ping each node from evey node across the thunderbolt mesh using IPv4 or IPv6 as you see fit.
I have built the 3-server setup with CEPH on AMD hardware (Ryzen 7 7840HS) using USB4. I have the same issues with IPv4 not starting automatically after reboot for the thunderbolt connections. Also, when configuring the frr configuration , I get an error message on "ip router openfabric 1" command. This line does not show up in the frr.conf file. When edited manually the IPv4 links eventually get enabled.
Now I have CEPH using IPv4, but I want to switch to use IPv6 because that always works. But CEPH seems to have problems with dual stack setup.
As reported earlier, the mini-PC's I use (Bee-link GTR7) show iperf3 throughput of about 12 Gbps over USB4 between two hosts. I expected more, but the interfaces seem to connect only with 20 Gbps USB speed. For me, that is enough for now.