HPE FlexNetwork MSR Series Comware 5 Layer 2 - Wan Access Configuration Guide

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refragment the packets depending on the flow control parameters of the link between Router B
and Router C.
By default, flow control negotiation is enabled for X.25 switching.
To configure flow control negotiation on an X.25 interface:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Enable flow control
negotiation for X.25
switching.
x25 flowcontrol
Enabled by default.
Configuring X.25 load sharing
Overview of X.25 load sharing
With the X.25 hunt group feature, network providers can load balance traffic across DTEs or links on
a DTE to prevent a link from being overwhelmed by excessive accesses.
In an X.25 network, load sharing is provided by DCEs. Skip this section, if your device is operating as
a DTE.
The following shows how X.25 load sharing is implemented:
• Configure a set of DTE/DCE interfaces (synchronous serial interfaces or XOT channels) as a
hunt group on the remote DCE, and assign an X.121 address for this hunt group.
• When a device accesses a DTE in the hunt group, the device calls the hunt group address.
• After receiving the call request, the remote DCE selects a line from the hunt group in the
round-robin or VC-number approach, and send the incoming call.
• The DCE distributes calls across the lines in the hunt group to implement load sharing.
X.25 load sharing is available only for SVCs, because PVCs do not have the call setup or clearing
phase. Line selection in an X.25 hunt group only occurs at the virtual circuit establishment phase.
After a virtual circuit is established, the DCE follows the normal procedure to transfer data on the
virtual circuit.
All DTEs in an X.25 hunt group use the same X.121 address. They can call DTEs outside the hunt
group in the normal call procedure. When a device accesses a hunt group, it does not know which
device it is accessing. Line selection is controlled by the DCE.
The address of the DTEs in a hunt group can be the same as the hunt group address. X.25 hunt
groups support source address and destination address substitution. With destination address
substitution, you can hide the DTE address in a hunt group from DTEs outside the hunt group for
security. In this approach, the DTEs outside the hunt group know only the hunt group address. With
source address substitution, you can hide the DTE addresses outside the hunt group from the DTEs
inside the hunt group for user privacy protection. In this approach, the DTEs inside the hunt group
know only the substitution address.

HPE FlexNetwork MSR Series Specifications

General

Brand	HPE
Model	FlexNetwork MSR Series
Category	Network Router
Language	English