What are the control messages exchanged between the Instant AP and L2TP Network Server (LNS) to establish L2TPv3 tunnel.

Aruba Employee
Aruba Employee

Environment- This article applies to Aruba Instant Access Points.


Instant AP architecture is a cost effective deployment model. mainly used for hub and spoke designs suitable for Schools, Retail Stores and Hotels. In such cases L2TP Network Server (LNS)  will help to extend the layer2 subnet from corporate to branch office and have the clients access resources and Internet. Wireless clients associated to IAP will get the IP address from the DHCP server running on LNS.

There are situations, where in the tunnel between IAP and the LNS server might experience issues in successfully establishing a tunnel. Below is the series of control exchange messages:

Control Connection Management:
1 (SCCRQ) Start-Control-Connection-Request
2 (SCCRP) Start-Control-Connection-Reply
3 (SCCCN) Start-Control-Connection-Connected
4 (StopCCN) Stop-Control-Connection-Notification
6 (HELLO) Hello
20 (ACK) Explicit Acknowledgement

Call Management:

7  (OCRQ)     Outgoing-Call-Request
8  (OCRP)     Outgoing-Call-Reply
9  (OCCN)     Outgoing-Call-Connected
10 (ICRQ)     Incoming-Call-Request
11 (ICRP)     Incoming-Call-Reply
12 (ICCN)     Incoming-Call-Connected
13 (reserved)
14  (CDN)      Call-Disconnect-Notify

Error Reporting:

15  (WEN)      WAN-Error-Notify

Link Status Change Reporting:

16  (SLI)      Set-Link-Info
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Last update:
‎04-02-2015 11:05 PM
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