CCIE RS LAB config mistake BGP neighbor not coming up

CCIE RS LAB  config mistake BGP neighbor not coming up

While I was configuring BGP neighbors it was not coming up .

What I did mistake

I have given wrong AS number in neighbor command and when I realize I have given the wrong AS number .then I did not use ” no neighbor x.x.x.x   as  xx ”   and   I  issued new command correcting the AS number. every thing was seems ok on “sh run |  se  bgp”  but neighbor was not coming up . and even after “clear ip bgp * ” command .

what was the solution

I just rebooted the  router  neighbor came up .

Comments Requested to clear why it was not coming .

 

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