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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Configuring Passive Peering

When you enable a peer-group, the software sends an OPEN message to initiate a TCP connection.

If you enable passive peering for the peer group, the software does not send an OPEN message, but it responds to an OPEN message.

When a BGP neighbor connection with authentication configured is rejected by a passive peer-group, the system does not allow another passive peer-group on the same subnet to connect with the BGP neighbor. To work around this, change the BGP configuration or change the order of the peer group configuration.

You can constrain the number of passive sessions accepted by the neighbor. The limit keyword allows you to set the total number of sessions the neighbor will accept, between 2 and 256. The default is 256 sessions.

  1. Configure a peer group that does not initiate TCP connections with other peers. CONFIG-ROUTER-BGP mode neighbor peer-group-name peer-group passive limit Enter the limit keyword to restrict the number of sessions accepted.
  2. Assign a subnet to the peer group. CONFIG-ROUTER-BGP mode neighbor peer-group-name subnet subnet-number mask The peer group responds to OPEN messages sent on this subnet.
  3. Enable the peer group. CONFIG-ROUTER-BGP mode neighbor peer-group-name no shutdown
  4. Create and specify a remote peer for BGP neighbor. CONFIG-ROUTER-BGP mode neighbor peer-group-name remote-as as-number
Only after the peer group responds to an OPEN message sent on the subnet does its BGP state change to ESTABLISHED. After the peer group is ESTABLISHED, the peer group is the same as any other peer group.

For more information about peer groups, refer to Configuring Peer Groups .

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