Hi,
I am trying the configuration for the GTP_U to SRv6 function T.M.GTP4.D.
Here is my setup
Trex container -------- > VPP Container ----->SrV6 end point containers
GTP-U pkt
The VPP container has two interfaces provided by K8s IPVLAN CNI. One is with
Ipv6 address and the other one is IPv4 which is in the same subnet as the
Trex container interface.
GTP tunnel is created between the interfaces of Trex and IPv4 interface of
VPP container.
command => *vppctl create gtpu tunnel src <Trex Ipv4 addr> dst <VPP
container ipv4 addr> teid 13*
"vppctl show int addr" shows all the interfaces including gtp tunnel
interface is UP.
Now created the SR policy rule-
command_1 => *vppctl sr policy add bsid fcf0:12::109 next fcf0:12::100
next fcf0:12::101 next fcf0:12::104:0E01:2042:D:1 behavior t.m.gtp4.d
fcf0:12::104/64 v6src_prefix fcf0:12::109/64 nhtype ipv4*
command2 => *vppctl sr steer l3 <local ipv4 IP of VPP>/32 via bsid
fcf0:12::109*
command3 => *vppctl set sr encaps source addr fcf0:12::109*
Here fcf0:12::109 is the local sid of VPP container. fcf0:12::100/64 and
fcf0:12::101/64 are the intermediate SIDs of the SRv6 end points.
fcf0:12::104:0E01:2042:D:1 is the final destination SID.
As per https://docs.fd.io/vpp/20.05/d7/d3c/srv6_mobile_plugin_doc.html, its
coded as destination prefix fcf0:12::104/64 followed by destination ipv4
ip, Teid(13=0xD) and QFI.
>From VPP container, "ip -6 route" is executed to the SID of the next
endpoint fcf0:12::100 over the ipv6 subnet.
Issue is when GTP-U packet with outer IP address as VPP destination ipv4
address is sent through Trex container, it reaches VPP but VPP is not
de-encapsulating GTP-U pkt received and sent over the SRv6 network.
Can anyone pls let me know what is missing in the commands.
VPP version v21.06-release.
Regards,
Subrata
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