[routing-wg] Multi home BGP reestablishment.

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


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