Hi Siva,
This looks to be like a bug as with SRD release I also do not see this option. I tried SRD6, However if I use SRE image I do get the option to debug a particular VRF. Refer command from SRE:
debug bgp vrf test ipv4 unicast 192.168.1.1
I filed a new defect: CSCtn92314. Should be availble on bug toolkit in a few days.
I hope this helps.
Regards,
Ruchir
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