Migrating X.25 over PSI to XOL

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Introduction......................................................................................................................................... 2

Definition of terms................................................................................................................................ 2

X.25 overview..................................................................................................................................... 3

X.25 over PSI .................................................................................................................................. 4

Logical Link Control (LLC) Overview ....................................................................................................... 4

X.25 over LLC2 ................................................................................................................................... 5

Features of XOL ................................................................................................................................... 5

Benefits of XOL.................................................................................................................................... 6

Migrating X.25 over PSI to XOL............................................................................................................. 6

Hardware Migration ........................................................................................................................ 6

Configuration Migration ................................................................................................................... 8

Application Migration..................................................................................................................... 11

High Availability with XOL.................................................................................................................. 12

Conclusion........................................................................................................................................ 12

For more information.......................................................................................................................... 13

Summary of content (13 pages)

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Migrating X.25 over PSI to XOL Introduction......................................................................................................................................... 2 Definition of terms................................................................................................................................ 2 X.25 overview..................................................................................................................................... 3 X.25 over PSI ...............
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Introduction X.25 is the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) protocol standard for WAN communication. X.25 defines how connections between user devices and network devices are established and maintained in a packet switched data network. With Ethernet evolving as the preferred network backbone for all environments, X.25 customers are seeking solutions to run X.25 applications on Ethernet interfaces. Based on this feedback, HP offers the X.
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WAN Wide Area Network XOL X.25 over LLC2 X.25 overview The HP-UX X.25 link solution provides the hardware and software components that enable HP 9000 systems and Integrity systems to communicate with other HP and non-HP systems over X.25 packet switching networks. The X.25 link implements the CCITT X.
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X.25 over PSI In accordance with CCITT X.25 Recommendations, three layers of protocol (Layer 1, Layer 2 and Layer 3) are functional when X.25 is used over PSI cards. Figure 2 shows the three protocol layers in X.25 over PSI. Figure 2. Three layers of protocol in X.25 over PSI ; 6RFNHW ,QWHUIDFH ,3 ,QWHUIDFH 3/3 /$3% :$1 Logical Link Control (LLC) Overview The LLC sub-layer is the upper sub-layer in the data link layer and is common to the various medium access methods.
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X.25 over LLC2 X.25 over LLC2 (XOL) enables X.25 communication over Ethernet LAN cards. The ISO 8881 standard specifies the implementation of X.25 communication over the LAN interface. The X.25 over LLC2 architecture is similar to the X.25 over PSI architecture. The protocol implementation in XOL is as follows:  The serial WAN interface (Layer 1) in X.25 over PSI is replaced by the LAN interface in XOL.  The LAP-B layer (Layer 2) in X.25 over PSI is replaced by LLC2 in XOL.
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 Level-2 modulo value supported At level 2, LLC2 supports only 128 as the Level-2 modulo value. Native LAPB supports 8 or 128 as the Level-2 modulo values. Note: Currently, there is no SAM support for XOL configuration. The X.25 configuration files are edited manually. The X.25 interface must be started and stopped manually. Benefits of XOL Following are the advantages of using XOL instead of X.25 over PSI card:  Lower hardware cost Ethernet cards cost less compared to PSI cards.
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Figure 4 illustrates the network configuration with X.25 over PSI. Figure 5 illustrates the network configuration after migration to XOL. Figure 4. X.25 setup with PSI Figure 5. X.25 setup with LLC2 Cards: The HP-UX X.25 PSI card (Part numbers J2792A, J2794A, J2815A, J3525A, or J3526A) is replaced with a supported LAN card. The supported LAN cards are Fast Ethernet cards and Gigabit Ethernet cards.
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Switch / Router: In X.25 over PSI, an X.25 switch is used as the DCE. The DCE routes X.25 to the remote DTE. For XOL, a router supporting the XOL feature (such as Cisco 3600 series) is required. The router and the XOL LAN card on the HP system are connected to the same LAN. Multiple HP-UX XOL interfaces communicate with the common XOL router through the LAN. The X.25 serial port in the XOL router communicates with the X.25 cloud. As a result, the X.
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Field standby_device** Format Description 0x. 0x7e, both inclusive. If the value for SSAP is not provided, then SSAP takes the value of DSAP. Name of the standby LAN device used for local failover. Required only for local failover support. Device name string. For more information about this parameter, see HP X.25/9000 User's Guide available at: Example: lan2 http://docs.hp.com/en/netcom.html#X.
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lci 1 svc 255 # #Flow Control, Throughput Class, Fast Select and Reverse Charge Settings # flowcontrol off thruputclass off fast_select_accept disabled reverse_charge disabled def_inpacketsize 128 def_outpacketsize 128 def_inwindow 2 def_outwindow 2 def_inthruputclass 11 def_outthruputclass 11 # # IP Parameters # ipaddress 192.168.8.1 255.255.255.0 idletimer 600 holdtimer 300 mtu 1024 Configuration file after migration to XOL Following is the generic configuration file for an X.
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flowcontrol off thruputclass off fast_select_accept disabled reverse_charge disabled def_inpacketsize 128 def_outpacketsize 128 def_inwindow 2 def_outwindow 2 def_inthruputclass 11 def_outthruputclass 11 # # IP Parameters # ipaddress 192.168.8.1 255.255.255.0 idletimer 600 holdtimer 300 mtu 1024 LLC2 specific configuration file The LLC2 specific configuration file is created in the /etc/x25 directory. The filename of the LLC2 specific configuration file is user-defined.
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High Availability with XOL The high availability (HA) feature is available in the XOL interface. The x25ifstate command integrates the XOL interface with the ServiceGuard (SG) scripts to create the SG package in an SG cluster environment. The SG package protects mission critical applications from hardware and software failures through the HA feature. In an HA environment, the standby resources automatically take over if the primary resource fails.
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For more information For more information on XOL, see the latest documentation for X.25 at http://docs.hp.com/en/netcom.html#X.25 © 2006 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty.