I received a complaint from one of our important client is having issues for their BGP peer connectivity with their one upstream ANSs (AS 3xxx I. e Level 3 ) network. My research and development was as following details: • Run BGP protocol • configure BGP peering sessions against one of unestablished edge,(i. e Level 3 ) using peer groups • and then advertise networks. [N. B I used some dummy character here in this example to hide real network IPs ANSs info.] Info: The max number of VTY users is 10, and the number of current VTY users on line is 1. The current login time is 2018-02-08 11:09:51. <XYG_NE40_H01> system-view Enter system view, return user view with Ctrl+Z. [XYG_NE40_H01] [XYG_NE40_H01] dis bgp peer BGP local router ID : 31.2x.xxx.xx Local AS number: 56XXX Total number of peers: 2 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre fRcv 4.69.249.28 4 3xxx 31061725 361482 0 01h13m Unestablished 0 149.14.146.113 4 17x 6842050 56912 0 0948h28m Established 0942 [XYG_NE40_H01] bgp 56XXX [XYG_NE40_H01] undo synchronization [XYG_NE40_H01] undo summary automatic [XYG_NE40_H01-bgp] peer 4.69.249.28 as-number 3xxx [XYG_NE40_H01-bgp] peer 4.69.249.28 description Level3_BXXXXXXX_10GE [XYG_NE40_H01-bgp] network 31.2x.xxx.0 255.255.248.0 [XYG_NE40_H01-bgp] network 31.2x.xxx.0 255.255.255.0 [XYG_NE40_H01-bgp] network 31.2x.xxx.0 255.255.255.0 [XYG_NE40_H01-bgp] network 31.2x.xxx.0 255.255.255.0 [XYG_NE40_H01-bgp] network 31.2x.xxx.0 255.255.255.0 [XYG_NE40_H01-bgp] network 31.2x.xxx.0 255.255.255.0 [XYG_NE40_H01-bgp] dis this # bgp 56XXX router-id 31.2x.xxx.20 peer 4.69.249.28 as-number 3xxx peer 4.69.249.28 description Level3_ BXXXXXXX_10GE peer 4.69.249.28 ebgp-max-hop 255 peer 149.14.146.113 as-number 17x peer 149.14.146.113 description Cogentco # ipv4-family unicast undo synchronization default local-preference 200 undo ebgp-interface-sensitive preference 200 200 200 network 31.2x.xxx.0 255.255.248.0 network 31.2x.xxx.0 255.255.255.0 network 31.2x.xxx.0 255.255.255.0 network 31.2x.xxx.0 255.255.255.0 network 31.2x.xxx.0 255.255.255.0 network 31.2x.xxx.0 255.255.255.0 network 149.14.146.112 255.255.255.248 peer 4.69.249.28 enable peer 149.14.146.113 enable peer 149.14.146.113 ip-prefix Cogentco-in import peer 149.14.146.113 ip-prefix Cogentco-out export # Return < XYG_NE40_H01> < XYG_NE40_H01> system-view Enter system view, return user view with Ctrl+Z. [XYG_NE40_H01] dis bgp peer BGP local router ID : 31.2x.xxx.xx Local AS number : 56XXX Total number of peers : 2 Peers in established state : 2 Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre fRcv 4.69.249.28 4 3xxx 31061725 361482 0h13m Established 140 149.14.146.113 4 17x 6842050 56912 0 0948h28m Established 1 < XYG_NE40_H01> quite Sent via RIPE Forum -- https://www.ripe.net/participate/mail/forum