Configuration procedure

Configuring XOT

When you configure XOT, follow these guidelines:

In SVC mode, X.25 routes are required.
Because the default two-way channel range (LTC=1, HTC=1024) does not support PVC configuration, you must specify a virtual circuit range by using the x25 vc-range command to create a PVC.

To configure XOT:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enable X.25 switching.	x25 switching	Required due to X.25 extension. Not enabled by default.
3. Enter interface view.	interface interface-type interface-number	N/A
4. Specify an IP address for the IP side interface.	ip address ip-address { mask \| mask-length } or ip address unnumbered interface interface-type interface-number	Make sure the IP network operates correctly.
5. Return to system view.	quit	N/A
6. Configure an XOT route to route X.25 packets through the IP network.	Configure a SVC XOT route: x25 switch svc [ -number ] x.121-address [ sub-dest destination-address \| sub-source source-address ] * xot ip-address&<1-6> [ xot-option ] x25 switch svc [ -number ] x.121-address [ sub-dest destination-address \| sub-source source-address ] * interface interface-type interface-number Configure PVC XOT route in interface view: interface interface-type interface-number x25 vc-range { bi-channel ltc htc [ out-channel loc hoc ] \| in-channel lic hic [ bi-channel ltc htc ] [ out-channel loc hoc ] \| out-channel loc hoc } x25 xot pvc pvc-number1 ip-address interface interface-type interface-number pvc pvc-number2 [ xot-option \| packet-size input-packet output-packet \| window-size input-window-size output-window-size ] *	Use one of the methods.
7. Configure XOT optional attributes.	See "Configuring XOT optional attributes."	Optional.

For more information about IP address configuration, see HPE FlexNetwork MSR Router Series Comware 5 Layer 3—IP Services Command Reference.

Configuring XOT optional attributes

After a TCP link is established, TCP will also not be cleared easily even if the link is interrupted. However, after the Keepalive attribute is configured, the router will periodically send the detection packet to check the availability of the link. If it has not received the acknowledgement after sending packets for many times, the router will deem the link faulty and will initiatively clear the TCP connection.

To configure XOT optional attributes:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Configure the SVC Keepalive and source attributes.	x25 switch svc [ -number ] x.121-address [ sub-dest destination-address \| sub-source source-address ] * xot ip-address&<1-6> [ xot-option ]	Optional.
3. Configure the PVC Keepalive and source attributes.	interface interface-type interface-number (Optional.) x25 xot pvc pvc-number1 ip-address interface interface-type interface-number pvc pvc-number2 [ xot-option \| packet-size input-packet output-packet \| window-size input-window-size output-window-size ] *	N/A

Table 7: Options of the xot-option argument

Option	Indicates
timer seconds	Keepalive timer for the XOT connection, in the range 1 to 3600 seconds. On its timeout the router begins to send keepalive messages to test availability of the connection.
retry times	The maximum number of Keepalive packet sending attempts, in the range 3 to 3600. When the number of keepalive packet sending attempts exceeds the limit, the XOT connection is disconnected.
source interface-type interface-number	Interface where the XOT connection is initiated.

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