APPN Add Link

This option allows you to configure APPN link parameters.

Answer the following questions:

  1. Link station name (required)

    This parameter specifies the name of a link station that represents the TG (link) between the router network node and the adjacent node. The link station name must be unique within this network node.

    Valid Values: A string of 1 to 8 characters:

    Default Value: None

  2. Port name

    This parameter specifies the name representing the port this link station is defined on. The port must already have been configured for APPN.

    Valid Values: A unique unqualified name that is automatically generated.

    The name will consist of:

    followed by the interface number.

    Default Value: The name of the port that this link station is defined on.

  3. MAC address of adjacent node (required)

    This parameter specifies the medium access control (MAC) layer address of the adjacent node. Different formats are used for token-ring and Ethernet/802.3:

    Token-ring

    Ethernet/802.3 ports:

    Valid Values:

    Token-ring

    Ethernet/802.3 ports:

    Default Value: None

  4. Adjacent node type

    This parameter identifies whether the adjacent node is an APPN node, a low-entry networking (LEN) end node or a PU 2.0 node supported by the DLUR function.

    When APPN end node is selected and Limited resource is No, APPN changes the adjacent node type internally to learn and will work with any node type.

    When APPN end node is selected and Limited resource is Yes, the adjacent node type is unchanged.

    The PU 2.0 option is valid only when DLUR is enabled on the router APPN network node.

    When you select LEN end node, the Fully qualified control point name parameter is a required parameter. If this network node is communicating with the IBM Virtual Telecommunications Access Method (VTAM) product through the LEN node, and the LEN node is not a T2.1 node or does not have an explicitly defined control point (CP) name, then the router network node's XID number for the Subarea connection parameter also must be specified to establish a connection.

    Valid Values:

    APPN network node, APPN end node, LEN end node, PU 2.0 node

    Default Value: APPN network node

  5. Fully qualified CP name of adjacent node

    This parameter specifies the fully qualified CP name of the adjacent node. For the cases where this parameter is not required, the adjacent node's CP name may be learned dynamically during XID exchange; however, if a CP name is specified, it must match the adjacent node's definition for the link to be successfully activated.

    This parameter is required when any of the following occur :

    Valid Values:

    A string of up to 17 characters in the form of netID.CPname, where:

    Each name must conform to the following rules:

    An existing fully qualified CP name, using the special characters @, $, and # from the character set A, continues to be supported; however, these characters should not be used for new CP names.

    Default Value: None

  6. Activate link automatically

    If limited resource, then this parameter is set to No and is not configurable.

    When this parameter is enabled, the router network node automatically activates the link to the adjacent node and initiates a connection.

    Valid Values: Yes, No

    Default Value: Yes

  7. Allow CP-CP sessions on this link

    This parameter specifies whether sessions between control points are to be activated over this link station.

    This parameter allows control of CP-CP session establishment between adjacent network nodes so that the overhead associated with topology database updates (TDUs) may be constrained.

    Every APPN network node must have at least one CP-CP session established to another APPN network node in order to maintain the minimum connectivity necessary to update the topology database. In addition, more than minimum connectivity could be desired to eliminate single points of failure and to improve network dynamics.

    Valid Values: Yes, No

    Default Value: Yes, if adjacent node type is APPN network node or APPN end node Disable for all other adjacent node types

  8. CP-CP session level security

    This parameter specifies whether session level security is enforced for CP-CP sessions established over this link station. When session level security is enabled, encrypted data is exchanged and compared during the BIND flows (which includes the BIND, the BIND response, and an FMH-12 Security RU). To successfully establish a CP-CP session with session level security enabled, both partners must be configured with the same encryption key. Currently, session level security support is limited to the basic LU-LU verification protocol.

    Valid Values: Yes, No

    Default Value: No

  9. Encryption key

    This parameter is used to encrypt data exchanged during BIND flows. Both partners must be configured with the same key to establish a CP-CP session.

    Valid Values: Up to 16 hexadecimal digits. If fewer than 16 digits are specified, the value is padded on the right with zeros.

    Default Value: None

  10. Use enhanced session security (If security is enabled)

    Valid Values: Yes, No

    Default Value: No

  11. High-performance routing (HPR) supported

    This parameter indicates whether this link station supports HPR. The user should disable HPR support if the underlying link is unreliable. An HPR connection will not be established unless both link stations advertise HPR support during XID exchange.

    Valid Values: Yes, No

    Default Value:

    APPN network node, APPN end node, or LEN end node : the value specified in the default HPR supported parameter for this port.

    All other adjacent node types : No

Enter station configuration information for ATM:

  1. Virtual Channel Type

    This parameter identifies the ATM channel type as switched virtual circuit (SVC) or permanent virtual circuit (PVC).

    Valid Values: SVC, PVC

    Default Value: SVC

  2. Destination ATM Address

    This parameter specifies the 20-byte string that comprises the entire destination ATM address.

    Valid Values: A 40- hexadecimal character string

    Default Value: None

  3. ATM network type

    This parameter specifies the ATM network type.

    Valid Values: Campus, Widearea

    Default Value: Campus

  4. Shareable connection network traffic

    This parameter specifies whether connection network traffic can be routed on the ATM VC set up this TG.

    Valid Values: Yes, No

    Default Value: No

  5. Shareable other protocol traffic

    This parameter specifies whether other higher level protocol traffic can be routed on the ATM VC set up for this TG.

    Valid Values: Yes, No

    Default Value: No

  6. TG Number

    This parameter specifies the TG number for the ATM VC.

    Valid Values: 0 - 20

    Default Value: 0

  7. LDLC retry count

    This parameter is used in conjunction with the LDLC timer period to provide reliable delivery of XIDs. The retry count is initialized when a command or request is first transmitted over the link. If the LDLC timer period expires before a response is received, the command or request is retransmitted, the retry count is decremented, and the LDLC timer period is restarted. If the timer expires with the retry count at 0, the link is assumed to be inoperative.

    Valid Values:

    1 - 255

    Default Value:

    3

  8. LDLC Timer Period

    This parameter specifies the timer period used with the LDLC retry count.

    Valid Values: 1 - 255 seconds

    Default Value: 1 second

  9. VPI

    This parameter identifies the VPI of the PVC at the interface.

    Valid Values: 0 - 255

    Default Value: 0

  10. VCI

    This parameter identifies the VCI of the PVC at the interface.

    Valid Values: 0 - 65535

    Default Value: 0

  11. Broadband Bearer Class

    This parameter specifies the bearer class requested from the ATM network. The classes are defined:

    Valid Values: Class_A, Class_C, Class_X

    Default Value: Class_X

  12. Best Effort Indicator

    This parameter indicates if a throughput guarantee is required on this SVC. If the value of this parameter is yes, then VCCs associated with this interface will be allocated based upon the available bandwidth.

    Valid Values: Yes, No

    Default Value: No

  13. Forward Peak Cell Rate

    This parameter indicates an upper bound on the cell transmission rate.

    Valid Values: 85% of line speed

    Default Value: Port's Default Effective Capacity/48

  14. Forward Sustained Cell Rate

    This parameter indicates an upper bound on the average cell transmission rate. You cannot specify this parameter for Best Effort connections.

    Valid Values: 1 - 85% of line speed

    Default Value: Port's Default Effective Capacity/48

  15. Forward Tagging ,P.This parameter indicates that cells that are nonconforming to cell loss priority 0 traffic specification but are conforming to cell loss priority 1 traffic specification are marked and allowed into the ATM network. You cannot specify this parameter for Best Effort connections.

    Valid Values: Yes, No

    Default Value: Yes

  16. QOS

    This parameter indicates which class of service is provided to an ATM virtual connection. You cannot specify this parameter for Best Effort connections.

    Valid Values:

    CLASS_0, CLASS_1, CLASS_2, CLASS_3, CLASS_4, where:

    Default Value: CLASS_0

  17. Backward Peak Cell Rate

    This parameter indicates an upper bound on the cell transmission rate.

    Valid Values: 1 - 85% of line speed

    Default Value: Taken from the port definition

  18. Backward Sustained Cell Rate

    This parameter indicates an upper bound on the average cell transmission rate. You cannot specify this parameter for Best Effort connections.

    Valid Values: 1 - 85% of line speed

    Default Value: Taken from the port definition

  19. Backward Tagging This parameter indicates that cells that are nonconforming to cell loss priority 0 traffic specification but are conforming to cell loss priority 1 traffic specification are marked and allowed into the ATM network. You cannot specify this parameter for Best Effort connections.

    Valid Values: Yes, No

    Default Value: Yes

  20. QOS This parameter indicates which class of service is provided to an ATM virtual connection. You cannot specify this parameter for Best Effort connections.

    Valid Values:

    CLASS_0, CLASS_1, CLASS_2, CLASS_3, CLASS_4, where

    Default Value: CLASS_0

Enter the following TG characteristics if you want to override the value set at the port:

  1. Cost per connect time

    This parameter expresses the relative cost of maintaining a connection over the associated TG. The units are user-defined and are typically based on the applicable tariffs of the transmission facility being used. The assigned values should reflect the actual expense of maintaining a connection over the TG relative to all other TGs in the network. A value of zero means that connections over the TG may be made at no additional cost (as in the case of many nonswitched facilities). Higher values represent higher costs.

    Valid Values: 0 to 255

    Default Value: Default value is taken from the associated port parameter.

  2. Cost per byte

    Valid Values: 0 to 255

    Default Value: Default value is taken from the associated port parameter.

  3. Security

    This parameter indicates the level of security protection associated with the TG. If security attributes other than the architecturally-defined ones are needed, one of the user-defined TG characteristics may be used to specify additional values.

    Valid Values:

    Default Value: Default value is taken from the associated port parameter.

  4. Propagation delay

    This parameter specifies the approximate range for the length of time that it takes for a signal to propagate from one end of the TG to the other.

    Valid Values:

    Default Value: Default value is taken from the associated port parameter.

  5. Effective capacity

    This parameter specifies the maximum bit transmission rate for both physical links and logical links. Note that the effective capacity for a logical link may be less than the physical link speed.

    The effective capacity is encoded as a single-byte representation. The values X'00' and X' FF' are special cases used to denote minimum and maximum capacities. The range of the encoding is very large; however, only 256 values in the range may be specified.

    Valid Values:

    2 hexadecimal digits in the range X'00' to X'FF'

    Default Value:

    Default value is taken from the associated port parameter.

  6. First user-defined TG characteristic

    This parameter specifies the first of three additional characteristics that users can define to describe the TGs in a network.

    Valid Values: 0 to 255

    Default Value: Default value is taken from the associated port parameter.

  7. Second user-defined TG characteristic

    This parameter specifies the second of three additional characteristics that users can define to describe the TGs in a network.

    Valid Values: 0 to 255

    Default Value: Default value is taken from the associated port parameter.

  8. Third user-defined TG characteristic

    This parameter specifies the third of three additional characteristics that users can define to describe the TGs in a network.

    Valid Values: 0 to 255

    Default Value: Default value is taken from the associated port parameter.

Enter the following Modify Dependent LU Server information:

  1. Fully qualified CP name of primary DLUS

    This parameter specifies the fully qualified CP name of the dependent LU server (DLUS) that is to be used for incoming requests from the downstream PU associated with this link station.

    Valid Values:

    A string of up to 17 characters in the form of netID.CPname, where :

    Each name must conform to the following rules:

    An existing fully qualified CP name, using the special characters @, $, and # from the character set A, continues to be supported; however, these characters should not be used for new CP names.

    Default Value: The value specified in the default fully qualified CP name of primary dependent LU server parameter.

  2. Fully qualified CP name for backup DLUS

    This parameter specifies the fully qualified CP name of the dependent LU server (DLUS) that is to be used as a backup for the downstream PU associated with this link station. This parameter allows the default backup server to be overridden. A backup is not required, and the NULL value indicates the absence of a backup server. Note that NULL can be specified even when a default backup server has been defined (by erasing the default value that appears for this parameter).

    Valid Values:

    A string of up to 17 characters in the form of netID.CPname, where :

    Each name must conform to the following rules:

    An existing fully qualified CP name, using the special characters @, $, and # from the character set A, continues to be supported; however, these characters should not be used for new CP names.

    Default Value:

    The value specified in the default fully qualified CP name of backup dependent LU server parameter.

Enter the following information to modify LLC Characteristics:

  1. Remote APPN SAP

    This parameter specifies the Destination SAP (DSAP) address on the destination node to which data will be sent. This DSAP address value will appear in the LLC frame to identify the service access point (SAP) address associated with the adjacent node's APPN link station.

    Valid Values: Multiples of four in the hexadecimal range of X'04' to X'EC'.

    Default Value: Default value is taken from the associated port parameter.

  2. Maximum number of outstanding I-format LPDUs (TW)

    This parameter specifies the transmit Command Line option which is the maximum number of sequentially numbered I-format LPDUs that the link station may have unacknowledged at any given time.

    Valid Values: 1 to 127

    Default Value: Default value is taken from the associated port parameter.

  3. Receive window size

    This parameter specifies the maximum number of unacknowledged sequentially numbered I-format LPDUs that the LLC link station can receive from the remote link station. RW is advertised in SNA XID frames and IEEE 802.2 XID frames. The XID receiver should set its effective TW to a value less than or equal to the value of the received RW to avoid overruns.

    Valid Values: 1 to 127

    Default Value: Default value is taken from the associated port parameter.

  4. Inactivity timer (Ti)

    A link station uses Ti to detect an inoperative condition in either the remote link station or in the transmission media. If an LPDU is not received in the time interval specified by Ti, an S-format command LPDU with the poll bit set is transmitted to solicit remote link station status. Recovery is then based on the reply timer (T1).

    Valid Values: 1 to 254 seconds

    Default Value: Default value is taken from the associated port parameter.

  5. Reply timer (T1)

    A link station uses T1 to detect a failure to receive a required acknowledgement or response from the remote link station. When T1 expires, the link station sends an S-format command link layer protocol data unit (LPDU) with the poll bit set to solicit remote link station status or any U-format command LPDUs that have not been responded to. The duration of T1 should take into account any delays introduced by underlying layers.

    Valid Values: 1 to 254 half-seconds

    Default Value: Default value is taken from the associated port parameter.

  6. Maximum number of retransmissions (N2)

    This parameter specifies the maximum number of times an LPDU will be retransmitted following the expiration of the reply timer (T1).

    Valid Values: 1 to 254

    Default Value: Default value is taken from the associated port parameter.

  7. Receive acknowledgement timer (T2)

    This parameter may be used in conjunction with the N3 counter to reduce acknowledgement traffic. A link station uses T2 to delay the sending of an acknowledgement for a received I-format LPDU. T2 is started when an I-format LPDU is received, and reset when an acknowledgement is sent in an I-format or S-format LPDU. If T2 expires, the link station must send an acknowledgement as soon as possible. The value of T2 must be less than that of T1, to ensure that the remote link station will receive the delayed acknowledgement before its T1 expires.

    Valid Values: 1 to 254 half-seconds

    Default Value: Default value is taken from the associated port parameter.

  8. Acknowledgement needed to increment working window

    When the working window (Ww) is not equal to the Maximum Transmit Window Size (Tw), this parameter is the number of tranmitted I-format LPDUs that must be acknowledged before the working window can be incremented (by 1). When congestion is detected, by the lost of I-format LPDUs, Ww is set to 1.

    Valid Values: 0 to 127 acknowledgements

    Default Value: Default value is taken from the associated port parameter.

Enter the following information to modify HPR Defaults:

  1. Inactivity timer override for HPR (HPR Ti)

    This parameter specifies the HPR override LLC inactivity timer (HPR Ti) that is to be used when HPR is supported by this link station. This parameter overrides the value taken from the default inactivity timer override for the HPR parameter.

    This parameter supersedes the value of the LLC inactivity timer (Ti) parameter specified on the Modify Logical Link Control (LLC) Characteristics parameter when HPR is supported.

    Valid Values: 1 to 254 seconds

    Default Value: Default value is taken from the associated port parameter.

  2. Reply timer override for HPR (HPR T1)

    This parameter specifies the HPR override LLC reply timer (HPR T1) that is to be used when HPR is supported by this link station. This parameter overrides the value taken from the default reply timer override for HPR parameter specified on HPR Defaults.

    This parameter supersedes the value of the LLC reply timer (T1) parameter specified on the Modify Logical Link Control (LLC) Characteristics parameter when HPR is supported.

    Valid Values: 1 to 254 half-seconds

    Default Value: Default value is taken from the associated port parameter.

  3. Maximum number retransmission (HPR N2)

    This parameter specifies the HPR override LLC maximum number of retransmissions (HPR N2) that is to be used when HPR is supported by this link station. This parameter overrides the value taken from the default maximum number of retransmissions for HPR parameter specified on the HPR LLC Override defaults.

    This parameter supersedes the value of the LLC maximum number of retransmissions (N2) parameter specified on the Modify Logical Link Control (LLC) Characteristics parameter when HPR is supported.

    Valid Values: 1 to 2 160 000

    Default Value: Default value is taken from the associated port parameter.

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