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In what scenarios, a diameter node maintains two connection with peer ?

+1 vote

I went through an article of diameter, it mentions " Diameter standard advises that a diameter node to maintain two connection primary and secondary connection". Diameter node uses first connection in normal conditions and go for second one if primary connection is abrupted or not available. How far it is correct and where it is used exactly ?

posted Dec 26, 2014 by Vikram Singh

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2 Answers

+1 vote

This is called multi-homing and is used by SCTP also.
This is to prevent any kind of down time and two nodes can have multiple links between each other over the same ip address or different ip addresses / Interfaces.

answer Dec 27, 2014 by Saurabh Srivastava
0 votes

On behalf of Bart ( ) -

Isn't this normal redundancy? I'm doing similar but equally costs multi path on Gn or Gi when designing solutions.

answer Dec 28, 2014 by Salil Agrawal
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In one Diameter blog, I saw a statement in which mentioned, if a Diameter node receive CER from unknown peer it responds back to that peer with Result-Code AVP set to "DIAMETER_UNKNOWN_PEER".
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I know Diameter client can re-transmit the request message until it receives the answer message.
But what about when a Diameter node has sent answer message to the last received request from its peer and that's is not received but its peer. In this case, from Diameter client node transaction is not completed since it did not receive answer message but from other node point of view it has responded with answer and transaction is completed.