Hi All, I was successful in installing quaga and got it working fine. Then I decided to try frr. I followed all the instructions mentioned in the link below. https://github.com/FRRouting/frr/blob/master/doc/Building_ FRR_on_Ubuntu1604.md Now when I try to telnet to zebra, it says "Vty password is not set". telnet localhost zebra Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. Vty password is not set. Connection closed by foreign host. I have added following config to /etc/frr/zebra.conf but that is not helping. sudo cat /etc/frr/zebra.conf [sudo] password for sidhesh: ! Zebra configuration saved from vty ! 2002/02/28 01:46:12 ! hostname LinuxRouter password zebra enable password z3bRa log file /var/log/zebra/zebra.log ! interface eth0 description Interface to External Network ip address 10.0.0.1/24 ! interface eth1 description Interface to Internal Network ip address 192.168.66.1/24 password zebra How do I configure Vty password for zebra in frr. -- -$iddhesh.