The CPM originated ping or traceroute packet is encoded with DA set to End.DT4, End.DT6, or End.DT46 SID and the next-header field set to IPv6 (IPv6 VRF prefix) or to IPv4 (IPv4 VRF prefix). The next-header field of the inner IPv6 header is set to ICMPv6 (for ping) or to UDP (for traceroute).
The packet is encapsulated as shown in Figure: Packet encapsulation for ping or traceroute of a VRF IPv6 prefix over an SRv6 tunnel. The LFA SRH is also shown in the packet encapsulation of the SRv6 tunnel to node D when the TI-LFA or remote LFA repair tunnel is activated.
Figure: Packet encapsulation for ping or traceroute of a VRF IPv6 prefix over an SRv6 tunnel
The outer IPv6 header hop-limit field is set to the default value 254.