SRv6

Mon Sep 14 20:42:58 UTC 2020

Oh snap!  Hey hey, that's good, thanks Nick.  I had to go into the locator service of the remote pe and find a sid that would respond to ping.  

This is apparently an OAM Endpoint with Punt (End.OP)

https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-0/segment-routing/configuration/guide/b-segment-routing-cg-asr9000-70x/b-segment-routing-cg-asr9000-70x_chapter_011.html

Here I'm executing ping/trace from the SRv6 ingress pe...to the egress PE

RP/0/RP0/CPU0:r1#ping fc00:0:4:4::1 source lo0 use-srv6-op-sid fc00:0:0:4:40::
Mon Sep 14 20:27:09.727 UTC
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to fc00:0:4:4::1, timeout is 2 seconds:
SSSSS
Success rate is 100 percent (5/5), round-trip min/avg/max = 329/371/416 ms

RP/0/RP0/CPU0:r1#traceroute fc00:0:4:4::1 source lo0 use-srv6-op-sid fc00:0:0:4:40::
Mon Sep 14 20:27:19.068 UTC

Type escape sequence to abort.
Tracing the route to fc00:0:4:4::1

 1  ::ffff:0.0.0.0
        [IP tunnel: DA=fc00:0:0:4:40:: SRH Stack 0 =(fc00:0:4:4::1   ,SL=1)     ] 29 msec
        [IP tunnel: DA=fc00:0:0:4:40:: SRH Stack 0 =(fc00:0:4:4::1   ,SL=1)     ] 56 msec
        [IP tunnel: DA=fc00:0:0:4:40:: SRH Stack 0 =(fc00:0:4:4::1   ,SL=1)     ] 12 msec
 2  ::ffff:0.0.0.0
        [IP tunnel: DA=fc00:0:0:4:40:: SRH Stack 0 =(fc00:0:4:4::1   ,SL=1)     ] 118 msec
        [IP tunnel: DA=fc00:0:0:4:40:: SRH Stack 0 =(fc00:0:4:4::1   ,SL=1)     ] 101 msec
        [IP tunnel: DA=fc00:0:0:4:40:: SRH Stack 0 =(fc00:0:4:4::1   ,SL=1)     ] 99 msec
 3  fc00:0:4:4::1 224 msec 277 msec 254 msec
 4  ::ffff:0.0.0.0 237 msec 209 msec 204 msec
 5  fc00:0:4:4::1 386 msec 431 msec 403 msec

Now I see this on the wireshark capture...

Ethernet - 86dd
Ipv6 - DA fc00:0:0:4:40:: (cool, this is the active/top SID, and not the ping'ed DA)
- routing header for v6 (segment routing)
--- segments left: 1
--- address next segment: fc00:0:4:4::1
Icmpv6

-Aaron