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vpp-1, tunnel 1: iosv-1 vpp-1 vpp-3 vpp-2 iosv-2

iosv-1
::a:1:1:0:6

to iosv2
ipv6 route ::a:1:1:0:16/128 ::a:1:1:0:7
to iosv4
ipv6 route ::a:1:1:0:22/128 ::a:1:1:0:7

vpp-1

::a:1:1:0:7
...
::a:1:1:0:e

sr tunnel src 0::a:1:1:0:6 dst 0::a:1:1:0:16/128 next 0::a:1:1:0:f next 0::a:1:1:0:1a next 0::a:1:1:0:16 tag 0::a:1:1:0:7 InPE 1 clean

vpp-3
::a:1:1:0:f
..
::a:1:1:0:1b

comment {fix src rpf screws}
ip route add ::a:1:1:0:6/128 via drop
ip route add ::a:1:1:0:16/128 via drop
ip route add ::a:1:1:0:22/128 via drop
vpp-2
::a:1:1:0:1a
..
::a:1:1:0:17

sr tunnel src 0::a:1:1:0:16 dst 0::a:1:1:0:6/128 next 0::a:1:1:0:1b next 0::a:1:1:0:e next 0::a:1:1:0:6 tag 0::a:1:1:0:17 InPE 1 clean

iosv-2
::a:1:1:0:16

ipv6 route ::a:1:1:0:6/128 ::a:1:1:0:17