[dev] Need Information About SR Tunnel Creation Using OSPF in FRR

[olivier.dugeon at orange.com]

Hi Shuvro,


Le 09/04/2019 à 08:51, Shuvro a écrit :
> Hi Team,
>
> I want to create one SR tunnel between 4 FRR nodes where one node will be used as head-end node which will be used to push the label stack.SRGB in all these nodes will be same(10000-19999).I am going to use the loopback interface for node SID. I have few questions in this regard:
> (1) How can I use one dummy interface as loopback in case of SR,I have tried using a dummy interface previously for vanilla OSPF and BGP,it works fine but in case of SR config,it complains:
> not a loopback interface
For that purpose, just add `ip address 10.0.0.1` (change 10.0.0.1 by the IP address is suitable for your testbed) for the lo interface in the zebra.conf file. This will add IP address to the loopback interface. You could also do that at the Linux layer with the `ip addr add ...` command.
But, I think it is safer to configure it within FRR

> (2)To provision the tunnel effectively,how can I use prefix SID for the connected interfaces.
> I was using:
> ip route x.x.x.x/mask <gateway> label as the node SID 
> Here,how can I configure prefix SID for the prefixes other than the node prefix.
UP to now, prefix SID are not supported. What you could perform is to add a static route to a given prefix and specify the label stack. Be careful for the label value. It is the real label value not the node SID. In your case, if the first router has a node SID equal to 100, the label will 10100 regarding your SRGB.

> (3)How can I verify the tunnel in the data plane (e.g. ping works fine).
Of course ping will work without SR due to OSPF routing. If you would check that the configuration is in place, you could perform a 'show ip route', 'show mpls table', show mpls fec' and at the Linux kernel 'ip route'. Now, if you run ping command, just launch a whiresharl/tshark/tcpdump tool to check that the ICMP packets are correctly encapsulated with MPLS.

>
> Any sample config in this regard will be helpful.

OSPF Segment Routing documentation is here: http://docs.frrouting.org/projects/dev-guide/en/latest/ospf-sr.html#ospf-segment-routing and you could find some examples in OSPF SR topotest here: http://docs.frrouting.org/projects/dev-guide/en/latest/ospf-sr.html#ospf-segment-routing (the configurations are under r1 - r4 directory)

Let me know if you have any trouble

Regards

Olivier
>
> Thanks,
> Shuvro
>
>
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