SRv6

Tue Sep 15 06:04:44 UTC 2020

On 14/Sep/20 22:42, aaron1 at gvtc.com wrote:

> 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

My head hurts :-)...

Mark.