Vipersat Configuration
3-26 Vipersat CDM-570/570L User Guide
most encryption methods, ToS switching provides an alternative means of
SCPC switching when encryption prevents the detection of SIP and H.323
protocols.
ToS detection occurs in the Remote modem classifier which only looks at traffic
that is passed in the LAN-to-SAT (Remote to Hub) direction. Once the ToS
Switch Detection feature is enabled, the Remote modem will send an ASR to
the VMS when a packet stamped with the ToS is detected. The ASR contains
the destination IP address of the ToS stamped packet, the desired SCPC rate,
and the VMS Switch Type (policy #). If available hardware and bandwidth
exist, the VMS will establish the SCPC carrier automatically.
Entering T at the command prompt in figure 3-34 toggles the TOS Switch
Detection command for the CDM-570/570L between Enabled and Disabled.
When enabling ToS switching, the ToS switching control parameters must be
defined as described in the section “ToS Switching Parameters” on page 3-32.
Applying a ToS value to an application (VoIP, IPVC, or priority data) through
either preservation or classification packet stamping allows the Vipersat switch-
ing system to function in an encrypted network. Normally in a non-encrypted
Vipersat network, packets are classified by the Remote CDM-570/570L using
protocol classification detection and the results are forwarded to VMS via
VESP (Vipersat External Switching Protocol) or, in legacy VMS systems, via
an ASR (Automatic Switch Request) message. The VMS switch detector
service then applies the required or requested bandwidth using policies which
have been pre-configured in the VMS. Refer to the VMS User’s Guide for
details.
For example, if in a non-encrypted network a voice application service connec-
tion is started, the CDM-570/570L’s classifier analyzes signaling and data
protocols (H.323, SIP, & Data RTP) being routed through the CDM-570/570L.
After connection detection, the process waits for data (RTP). Data is normally
sent after the receiving party answers, which then triggers the system to process
an ASR. Using the ToS classification, the detection function allows application-
based switching in encrypted networks where the signaling protocols are
encrypted or effectively hidden.
Note: Load switching by the VMS is not affected by enabling ToS detec-
tion.
QoS Switch Detection
This menu item appears for Remote modems only.
One of the four automatic switching functions that the Vipersat CDM-570/570L
is able to perform is QoS (Quality of Service) Switching. With this feature, an
STDMA to SCPC switch can be initiated based upon any type of IP traffic flow
that matches a defined QoS queue. QoS detection occurs in the Remote modem
NOTE