Hej
Loo.141 is loopback specific to that VRF, main instance uses lo0.0. Each Router is configured the same way.
The problem does indeed look like a routing problem.
Even though each router have the VRF loopback address in their routing tables, R6 and R8 can not ping R4 VRF Loopback even when R3 is active/deactive
{master}[edit]
odj@test3pe1dk:Oscar-Lab-R3# run show route 172.30.5.0/24 table CE1.inet.0 | no-more
CE1.inet.0: 23 destinations, 44 routes (23 active, 0 holddown, 5 hidden)
+ = Active Route, - = Last Active, * = Both
172.30.5.17/32 *[Direct/0] 10:37:10
> via lo0.131
172.30.5.21/32 *[BGP/170] 10:37:29, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.22 via ge-1/1/3.134, Push 50
to 172.30.0.22 via ge-1/1/3.134, Push 50
172.30.5.29/32 *[BGP/170] 10:38:20, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.22 via ge-1/1/3.134, label-switched-path Q
to 172.30.0.13 via ge-1/1/3.123, label-switched-path Bypass->172.30.0.22
172.30.5.37/32 *[BGP/170] 10:38:20, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.13 via ge-1/1/3.123, label-switched-path J
to 172.30.0.22 via ge-1/1/3.134, label-switched-path L
to 172.30.0.22 via ge-1/1/3.134, label-switched-path Bypass->172.30.0.13->172.30.0.1
odj@test3pe1dk:Oscar-Lab-R4# run show route 172.30.5.0/24 table CE1.inet.0 | no-more
CE1.inet.0: 28 destinations, 45 routes (28 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
172.30.5.17/32 *[BGP/170] 10:26:09, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.21 via ge-1/1/4.134, Push 54
to 172.30.0.21 via ge-1/1/4.134, Push 54
172.30.5.21/32 *[Direct/0] 10:37:30
> via lo0.141
172.30.5.29/32 *[BGP/170] 10:26:09, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
to 172.30.0.21 via ge-1/1/4.134, Push 16
> to 172.30.0.30 via ge-1/1/4.145, Push 16
172.30.5.37/32 *[BGP/170] 10:26:09, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.5 via ge-1/1/4.114, Push 16
to 172.30.0.30 via ge-1/1/4.145, Push 16
odj@test3pe1dk:Oscar-Lab-R6# run show route 172.30.5.0/24 table CE1.inet.0 | no-more
CE1.inet.0: 27 destinations, 54 routes (23 active, 0 holddown, 16 hidden)
+ = Active Route, - = Last Active, * = Both
172.30.5.17/32 *[BGP/170] 10:37:10, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.33 via ae1.156, label-switched-path R
to 172.30.0.25 via ge-1/1/6.136, label-switched-path Bypass->172.30.0.33
172.30.5.21/32 *[BGP/170] 10:37:29, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.33 via ae1.156, Push 50
to 172.30.0.25 via ge-1/1/6.136, Push 50
172.30.5.29/32 *[Direct/0] 11:15:18
> via lo0.161
172.30.5.37/32 *[BGP/170] 11:12:03, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.33 via ae1.156, Push 16, Push 31(top)
to 172.30.0.33 via ae1.156, Push 16, Push 31(top)
to 172.30.0.42 via ge-1/1/6.167, Push 16, Push 24(top)
to 172.30.0.42 via ge-1/1/6.167, Push 16, Push 24(top)
odj@test3pe1dk:Oscar-Lab-R8# run show route 172.30.5.0/24 table CE1.inet.0 | no-more
CE1.inet.0: 23 destinations, 50 routes (23 active, 0 holddown, 12 hidden)
+ = Active Route, - = Last Active, * = Both
172.30.5.17/32 *[BGP/170] 10:37:10, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.9 via ge-1/1/8.118, label-switched-path I
to 172.30.0.45 via ge-1/1/8.178, label-switched-path K
to 172.30.0.45 via ge-1/1/8.178, label-switched-path Bypass->172.30.0.9->172.30.0.2
172.30.5.21/32 *[BGP/170] 10:37:29, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
> to 172.30.0.9 via ge-1/1/8.118, Push 50
to 172.30.0.37 via ge-1/1/8.158, Push 50
172.30.5.29/32 *[BGP/170] 11:12:03, localpref 100, from 172.30.5.41
AS path: I, validation-state: unverified
to 172.30.0.37 via ge-1/1/8.158, Push 16, Push 29(top)
to 172.30.0.37 via ge-1/1/8.158, Push 16, Push 29(top)
> to 172.30.0.45 via ge-1/1/8.178, Push 16, Push 25(top)
to 172.30.0.45 via ge-1/1/8.178, Push 16, Push 25(top)
172.30.5.37/32 *[Direct/0] 11:15:18
> via lo0.181
Regards
Oscar