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Query about BGP active state

I have query about BGP active state, please share your expert comments -

  1. From Idle > Connect > Active = Here BGP stuck in "Active" state after connect state due to Source or  Destination IP unreacable OR TCP port 179 Not permited/Filter on  interface(Used for TCP connection) on either side,

My Under-standing  is - This  condition in not comes or not relevant due AS no. mismatch, because it  all these three state no update message (in which BGP version, As no.  information shared) is sharing/traversing by both side.

Please correct me If I am wrong.

        2.  From Idle > Connect > OpenSent(not received OpenConfirm) > Active = Here BGP stuck in "Active" state due to Update message option not match either side.

My Under-standing is - This condition will not come due to Source or Destination IP unreacable  OR TCP port 179 Not permted/Filter on interface(Used for TCP  connection) on either side. because these parameter already checks till  connect state(TCP 3 way hand shake completed ).

Please correct me If I am wrong.

I look forward for your comments

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Query about BGP active state

Hi Amit,

I think you are correct on both.

The BGP FSM will in active state if cannot establish the TCP session. It will move from OpenSent to active if error notification is received. This complaints RFC 1171.

HTH,
Lei Tian

Sent from Cisco Technical Support iPhone App

2 REPLIES
Cisco Employee

Re: Query about BGP active state

Hi Amit,

I think you are correct on both.

The BGP FSM will in active state if cannot establish the TCP session. It will move from OpenSent to active if error notification is received. This complaints RFC 1171.

HTH,
Lei Tian

Sent from Cisco Technical Support iPhone App

New Member

Query about BGP active state

many thanks Lei Tian, It is really a great help. 

Thanks!

Amit Kumar

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