This chapter describes the commands to configure the downstream physical unit (DSPU) feature, which provides a gateway facility for downstream System Network Architecture (SNA) physical units (PUs). For DSPU configuration tasks and examples, refer to the "Configuring DSPU" chapter of the Router Products Configuration Guide.
dspu activation-window
Use the dspu activation-window global configuration command to define the number of activation request units (RUs) and response messages (such as ACTLUs or DDDLU NMVTs) that can be sent without waiting for responses from the remote PU. Use the no form of this command to return to the default window size.
dspu activation-window window-size no dspu activation-window
Syntax Description
window-size
Number of outstanding unacknowledged activation RUs.
Default
The default window size is five outstanding unacknowledged activation RUs
Command Mode
Global configuration
Usage Guidelines
You do not typically need to define the number of activation RUs, but you can do so to tune activation performance in some situations. Increasing the DSPU activation window allows more LUs to become active in a shorter amount of time (assuming the required buffers for activation RUs are available). Conversely, decreasing the DSPU activation window limits the amount of buffers the DSPU can use during PU/LU activation. This command provides pacing to avoid depleting the router buffer pool during PU activation.
Example
In the following example, the DSPU activation window is configured to 10. The DSPU can send up to 10 activation RUs without a response from the remote PU. However, the DSPU cannot send any additional activation RUs until a response is received. The DSPU can only have 10 activation RUs awaiting response at any given time.
dspu activation-window 10
dspu default-pu
Use the dspu default-pu global configuration command to enable the default PU feature to be used when a downstream PU attempts to connect, but does not match any of the explicit PU definitions. Use the no form of this command to disable the default PU feature.
dspu default-pu [windowwindow-size] [maxiframemax-iframe] no dspu default-pu [windowwindow-size] [maxiframemax-iframe]
Syntax Description
window window-size
(Optional) Defines the send and receive window sizes used across the link. The range is 1 to 127. The default is 7.
maxiframe max-iframe
(Optional) Defines the maximum size (in bytes) of an I-frame that can be transmitted or received across the link. The range is 64 bytes to 18,432 bytes. The default is 1472.
Defaults
window-size: 7 max-iframe: 1472
Command Mode
Global configuration
Usage Guidelines
If the DSPU default PU is not defined, a connection attempt by a downstream PU that does not match any of the explicit PU definitions will be rejected.
The dspu default-pu command must be followed by at least one dspu lu command to define which pool the default LUs will be assigned from. Note that default LUs cannot be defined as dedicated LUs from a host.
The maximum I-frame size includes the SNA transmission header (TH), request header (RH), and RU, but does not include the DLC header. The DSPU feature segments frames being transmitted to fit within this frame size. If an XID is received from a remote PU which indicates that it supports a different maximum I-frame size, then the smaller of the two values is used.
Example
In the following example, the default PU feature is enabled with a window size of 5 and a maximum I-frame size of 128. Each default PU canhave up to 3 LUs assigned from the hostpool pool of LUs.
Use the dspu enable-host interface configuration command to enable a SAP for use by DSPU host connections. Use the no form of this command to disable the SAP.
dspu enable-host [lsaplocal-sap] no dspu enable-host [lsaplocal-sap]
Syntax Description
lsap
(Optional) Specifies that the local SAP will be activated as an upstream SAP for both receiving incoming connection attempts and for starting outgoing connection attempts.
local-sap
(Optional) The local SAP address. The default is 12.
Default
local-sap: 12
Command Mode
Interface configuration
Example
In the following example, the local SAP address 10 on Token Ring interface 0 is enabled for use by the ibm3745 DSPU host:
Use the dspu enable-pu interface configurationcommand to enable a SAP for use by DSPU downstream connections. Use the no form of this command to disable the SAP.
dspu enable-pu [lsaplocal-sap] no dspu enable-pu [lsaplocal-sap]
Syntax Description
lsap
(Optional) Specifies that the local SAP will be activated as a downstream SAP for both receiving incoming connection attempts and for starting outgoing connection attempts.
local-sap
(Optional) The local SAP address. The default is 8.
Default
local-sap: 8
Command Mode
Interface configuration
Example
In the following example, the local SAP address 20 on Token Ring interface 0 is enabled for use by the ciscopu DSPU downstream PU:
dspu pu ciscopu xid-rcv 05D00001 rmac 1000.5AED.1F53 lsap 20
The XID that will be sent to the host during connection establishment. The XID value is 8 hexadecimal digits that include both Block and ID numbers. For example, if the XID value is 05D00001, the Block number is 05D and the ID number is 00001.
rmac rmac
The MAC address of the remote host PU.
rsap remote-sap
(Optional) Specifies the SAP address of the remote host PU. The default is 4.
lsap local-sap
(Optional) Specifies the local SAP address used by the DSPU to establish connection with the remote host.
window window-size
(Optional) Specifies the send and receive window sizes used for the host link. The range is 1 to 127.
maxiframe max-iframe
(Optional) Specifies the send and receive maximum I-frame sizes used for the host link. The range is 64 to 18432. The default is 1472.
retries retry-count
(Optional) Specifies the number of times the DSPU attempts to retry establishing connection with remote host PU. The range is 0 to 255 (0 = no retry attempts, 255 = infinite retry attempts). The default is 255.
retry-timeout retry-timeout
(Optional) Specifies the delay (in seconds) between DSPU attempts to retry establishing connection with remote host PU. The range is 1 to 600 seconds. The default is 30.
focalpoint
(Optional) Specifies that the host link will be used for the focal point support.
Use the dspu lu global configuration command to define a range of LUs on a downstream PU. Use the no form of this command to remove the definition.
dspu lu lu-start[lu-end] [pool pool-name | host host-name host-lu-start] [pupu-name] no dspu lu lu-start[lu-end] [pool pool-name][host host-name host-lu-start] [pupu-name]
Syntax Description
lu-start
Specifies the starting LU address in the range of LUs to be assigned from a pool or dedicated to a host.
lu-end
(Optional) Specifies the ending LU address in the range of LUs to be assigned from a pool or dedicated to a host.
pool pool-name
(Optional) Specifies that each LU in the range of LUs will be assigned from the specified pool.
host host-name host-lu-start
(Optional) Specifies that each LU in the range of LUs will be dedicated to a host LU host-name. The range of host LUs starts with the address host_lu_start.
pu pu-name
(Optional) Specifies the downstream PU for which this range of LUs is being defined.
Default
There are no default specifications.
Command Mode
Global configuration
Usage Guidelines
If the dspu lu command immediately follows a dspu pu command (either explicit or default) it will be applied to that PU and the pu keyword is not required. If the pu keyword is included, the LU defined by the dspu lu command will be applied to the named PU.
The pool and host parameters are mutually exclusive. You can define a range of LUs to be either assigned from a pool or dedicated to a host.
Examples
The following example defines downstream LUs as pooled LUs. The downstream PU, ciscopu, has 3 downstream LUs with addresses 2, 3, and 4. When ciscopu establishes a connection with the DSPU, the three downstream LUs (2, 3, and 4) will be assigned to any three of the 20 LUs from the hostpool pool of LUs.
dspu pu ciscopu xid-rcv 05D00001 rmac 1000.5AED.1F53
dspu lu 2 4 pool hostpool
The following example defines downstream LUs as dedicated LUs. The downstream PU, ciscopu, has 3 downstream LUs with addresses 2, 3, and 4. When ciscopu establishes a connection with the DSPU, the three downstream LUs (2, 3, and 4) will be dedicated to LUs 22, 23, and 24, respectively, from the ibm3745 host.
dspu pu ciscopu xid-rcv 05D00001 rmac 1000.5AED.1F53
dspu lu 2 4 host ibm3745 22
The following example defines downstream LUs as a mixture of pooled and dedicated LUs. The downstream PU, ciscopu, has 6 downstream LUs with addresses 2 to 7. When ciscopu establishes a connection with the DSPU, three of the 20 LUs from the hostpool pool of LUs will be assigned to downstream LUs 2, 3, and 6. Downstream LUs 4, 5, and 7 will be dedicated to LUs 24, 25, and 27, respectively, from the ibm3745 host.
Use the dspu poollu global configuration command to define a range of host LUs in an LU pool. Use the no form of this command to remove the definition.
dspu pool pool-name host host-name lu lu-start [lu-end] [inactivity-timeout inactivity-minutes] no dspu pool pool-name host host-name lu lu-start [lu-end] [inactivity-timeout inactivity-minutes]
Syntax Description
pool-name
Specifies the name identifier of the pool.
host host-name
Specifies the name of the host that owns the range of host LUs in the pool.
lu lu-start
Specifies the starting LU address in the range of host LUs in the pool.
lu-end
(Optional) Specifies the ending address (inclusive) of the range of host LUs in the pool. If no ending address is specified, only one LU (identified by lu-start) will be defined in the pool.
inactivity-timeout inactivity-minutes
(Optional) Specifies the interval of inactivity (in minutes) on either the SSCP-LU or LU-LU sessions, which will cause the downstream LU to be disconnected from the upstream LU.
Default
The inactivity-timeout is disabled.
Command Mode
Global configuration
Usage Guidelines
You can include multiple dspu pool commands that specify the same pool name. In this way, an LU pool can include several LU ranges from the one host PU, or it can include LUs from different host PUs. The LUs from host host-name starting at lu-start and ending with lu-end, inclusive, will be defined in the pool pool-namewill be included in the pool pool-name. For the LUs in this pool, if there is no traffic on either the SSCP-LU or LU-LU sessions for the inactivity-timeout number of minutes, the downstream LU will be disconnected from the upstream LU, and the upstream LU will be allocated to any downstream LU waiting for a session. A value of zero for inactivity minutes means that there will be no timeout of sessions. (Note that the inactivity-timeout applies to all LUs in this pool, not just the LUs defined by this dspu pool command. The last value configured will be used.)
Examples
The following example defines a pool of host a pool LUs. A pool of 253 host LUs is defined with all LUs supplied from the ibm3745 host PU:
The following example defines multiple pools and defines a disjoint pool of host LUs. One pool with a total of 205 host LUs and second pool with a total of 48 host LUs are defined with all LUs supplied from the same ibm3745 host PU. Host LUs with addresses 2 to 201 and 250 to 254 are defined in hostpool1. Host LUs with addresses 202 to 249 are defined in hostpool2.
The following example defines a pool of LUs from multiple hosts. A pool of 506 host LUs is defined with 253 LUs supplied by the ibm3475 host PU and 253 supplied by the ibm3172 hostPU.
(Optional) Specifies the MAC address of the downstream PU.
rsap remote-sap
(Optional) Specifies the SAP address of the downstream PU. The default is 4.
lsap local-sap
(Optional) Specifies the local SAP address used by the DSPU to establish connection with the downstream PU. The default is 8.
xid-rcv xid
(Optional) Specifies a match on XID.
window window-size
(Optional) Specifies the send and receive sizes used for the downstream PU link. The range is 1 to 127. The default is 7.
maxiframe max-iframe
(Optional) Specifies the maximum I-frame that can be transmitted or received across the link. The range is 64 to 18,432. The default is 1472.
retries retry-count
Specifies the number of times the DSPU attempts to retry establishing connection with downstream PU. The range is 0 to 255 (0 = no retry attempts, 255 = infinite retry attempts). The default is 4.
retry-timeout retry-timeout
(Optional) Specifies the delay (in seconds) between DSPU attempts to retry establishing connection with downstream PU. The range is 1 to 600 seconds. The default is 30.
The send and receive maimum I-frame size includes the SNA TH and RH, but does not include the data link control header. The DSPU feature will segment frames being transmitted to fit within this frame size. If an XID is received from a remote PU which indicates that it supports a different maximum I-frame size, then the smaller of the two values is used
If you want the DSPU to attempt a ConnectOut to the remote node using the dspu start command, you must configure the rmac keyword and argument. If you want this PU to match against a ConnectIn attempt, then several combinations of rmac, rsap, xid-rcv are possible. The matching algorithms are as follows:
rmac—Match on remote MAC/SAP address of downstream PU
xid-rcv—Match on XID value received from downstream PU.
rmac/rsap, xid-rcv—Match on remote MAC/SAP address of downstream PU and XID value received from downstream PU.
If an XID is received from a remote PU which indicates that it supports a different maximum I-frame size, then the smaller of the two values is used.
Examples
In the following example, a downstream PU is defined with only the MAC address and SAP address specified. A downstream PU that attempts an incoming connection to the DSPU will only be accepted if the remote MAC/SAP address matches the configured values for this downstream PU (and the proper local SAP address is enabled).
dspu pu ciscopu rmac 1000.5AED.1F53 rsap 20
dspu lu 2 5 pool hostpool
interface tokenring 0
dspu enable-pu lsap 8
In the following example, a downstream PU is defined with only an xid-rcv value. Any downstream PU that attempts an incoming connection specifying the xid-rcv value, 05D00001, will be accepted without regard to remote MAC or SAP address (although the proper local SAP address must be enabled).
dspu pu ciscopu xid-rcv 05d00001
dspu lu 2 5 pool hostpool
interface tokenring 0
dspu enable-pu lsap 8
In the following example, a downstream PU is defined with xid-rcv, rmac, and rsap parameters. Any downstream PU that attempts to connectIn to the DSPU must match all three configured values for the connection to be accepted (the proper local SAP address must also be enabled).
dspu pu ciscopu xid-rcv 05d00001 rmac 1000.5AED.1F53 rsap 20
Use the dspu rsrb global configuration command to define the local virtual ring, the virtual bridge, the target virtual ring, and the virtual MAC address that the DSPU feature will simulate at the RSRB. Use the no form of this command to cancel the definition.
The bridge number connecting the DSPU local virtual ring and the RSRB target virtual ring. Currently, the bridge number must always be configured with a value of 1.
target-virtual-ring
The RSRB target virtual ring number. The RSRB target virtual ring corresponds to the ring-number parameter defined by a source-bridge ring-group command.
virtual-macaddr
The DSPU virtual MAC address.
Default
There are no default settings.
Command Mode
Global configuration
Usage Guidelines
The bridge number has a value of 1 only. This parameter can be specified only once in a configuration.
Use the dspu rsrb command to enable DSPU host and downstream connections to be established across an RSRB link.
If the local-ack parameter is specified on the source-bridge remote-peer statement, DSPU will establish host connections across RSRB using local acknowledgment. DSPU cannot support local acknowledgment for downstream PU connections across RSRB.
Examples
The following example defines DSPU to start connection to host across RSRB link (without local acknowledgment). The DSPU is identified by its local ring number 88 and its virtual MAC address 4000.FFFF.0001. When the DSPU attempts an outgoing connection to the ibm3745 host, the connection will be established across the RSRB virtual ring 99.
The following example defines DSPU to start connection to host across RSRB link (with local acknowledgment). The DSPU is identified by its local ring number 88 and its virtual MAC address 4000.FFFF.0001. When the DSPU attempts an outward connection to the ibm3745 host, the connection will be established across the RSRB virtual ring 99 using RSRB local acknowledgment.
The following example defines DSPU to allow connection from downstream PU across RSRB link.The DSPU is identified by its local ring number 88 and its virtual MAC address 4000.FFFF.0001. The downstream PU will specify the DSPU virtual MAC address 4000.FFFF.0001 and SAP address 20 in its host definitions. The DSPU will accept incoming connections from the downstream PU across the RSRB virtual ring 99.
source-bridge ring-group 99
source-bridge remote-peer 99 tcp 150.10.13.1
source-bridge remote-peer 99 tcp 150.10.13.2
dspu rsrb 88 1 99 4000.FFFF.0001
dspu rsrb enable-pu lsap 20
dspu pu ciscopu xid-rcv 05D00001 lsap 20
interface serial 0
ip address 150.10.13.1 255.255.255.0
Related Commands
A dagger () indicates that the command is documented in another chapter.
Use the dspu rsrb enable-host global configuration command to enable an RSRB SAP for use by DSPU host connections. Use the no form of this command to disable the RSRB SAP.
dspu rsrb enable-host [lsaplocal-sap] no dspu rsrb enable-host [lsaplocal-sap]
Syntax Description
lsaplocal-sap
(Optional) Specifies that the local SAP address will be activated as an upstream SAP for both receiving incoming connections attempts and for starting outgoing connection attempts. The default is 12.
Default
local-sap: 12
Command Mode
Global configuration
Example
In the following example, the local SAP address 10 of the RSRB is enabled for use by the ibm3745 host PU:
Use the dspu rsrb enable-pu global configuration command to enable an RSRB SAP for use by DSPU downstream connections. Use the no form of this command to disable the SAP.
dspu rsrb enable-pu [lsaplocal-sap] no dspu rsrb enable-pu [lsaplocal-sap]
Syntax Description
lsap local-sap
(Optional) Specifies that the local SAP address will be activated as an upstream SAP for both receiving incoming connection attempts and for starting outgoing connection attempts.
Default
local-sap: 8
Command Mode
Global configuration
Example
In the following example, the local SAP address 20 of the RSRB is enabled for use by the ciscopu DSPU downstream PU:
Use the dspu rsrb start global configuration command to specify that an attempt will be made to connect to the remote resource defined by host name or pu name through the RSRB. Use the no form of this command to cancel the definition.
Before issuing this command, you must enable the correct local SAP with the appropriate enable command (dspu rsrb enable-host for a host resource, and dspu rsrb enable-pufor a PU resource.)
This command is only valid if the target MAC address has been defined in the resource. For a host resource, this not a problem because the MAC addressis mandatory, but for a PU resource the MAC address is optional. The command will fail if the MAC address is missing.
Example
In the following example, the DSPU will initiate a connection with the ibm3745 host PU across the RSRB link:
Use the dspu start interface configuration command to specify that an attempt will be made to connect to the remote resource defined by host name or pu name. Use the no form of this command to cancel the definition.
Before issuing this command, you must enable the correct local SAP with the appropriate enable command (dspu enable-host for a host resource, and dspu enable-pu for a PU resource).
This command is only valid if the target MAC address has been defined in the resource. For a host resource, this not a problem because specifying the MAC address is mandatory, but for a PU resource specifying the MAC address is optional. The command will fail if the MAC address is missing.
Example
In the following example, the DSPU will initiate a connection with the ciscopu downstream PU on the Token Ring interface 0:
dspu pu ciscopu xid-rcv 05D00001 rmac 1000.5AED.1F53 lsap 20
