3Com Router User Manual

							Configuration of DLSw 387
forwarding. This command is used to specify the virtual MAC address on the 
interface, thus providing source MAC address for transforming SDLC message into 
LLC2 message.
Please process the following configurations in the synchronous interface view.
Ta b l e 434   Configure SDLC virtual MAC address
There is no SDLC virtual MAC address by default.
Note that there are two forms of SDLC virtual MAC address: one is not followed 
by sdlc-address, in this form, the address to be configured is the shared VMAC 
address on the interface; the other is followed by adlc-address, that is, the VMAC 
is configured for the specified ADLC address node. When one ADLC node is 
configured with its own VMAC, it will use this VMAC address as the source MAC 
address for DLSw; if the node does not has its own VMAC, it will use the shared 
VMAC address, and applies its own sdlc-address as the last byte of the VMAC 
address, so as to differentiate between this address and other ADLC nodes.
8Configure SDLC Address
SDLC protocol permits that several virtual circuits exist in a SDLC physic link. The 
one end connects to the primary station and the other end connects to the 
secondary station. You should specify the SDLC address of each virtual circuit so as 
to differentiate the virtual circuit. SDLC is unbalanced mode through sharer or 
SDLC switch. One primary equipment can be connected with several secondary 
equipment and the relationship is unique. However, connection cannot be 
established between secondary equipment. It can ensure that communication 
normally operates in one group of SDLC equipment only if the addresses of 
secondary equipment are identified. This command is used to specify SDLC 
address for virtual circuit. The address is unique in a physical interface. The SDLC 
address configured on the synchronous interface is the de facto address of SDLC 
secondary station.
Please process the following configurations in the synchronous interface view.
Ta b l e 435   Configure SDLC address
There is no SDLC synchronous interface address by default.
SDLC addresses range from 0x01 to 0xFE. The SDLC address on a router is valid for 
one physical interface. That is, the SDLC addresses configured on the different 
interfaces can be same.
9Configure SDLC Peer Entity
This command is used to specify a next-hop MAC address on the other end for a 
SDLC virtual address so as to provide the destination MAC address when 
transforming from SDLC to LLC2. When setting up DLSw, one SDLC address 
should be configured with one corresponding partner. The MAC address of 
OperationCommand
Configure SDLC virtual MAC addresssdlc mac-map local mac-address 
[ sdlc-address ]
Delete SDLC virtual MAC addressundo sdlc mac-map local [ 
sdlc-address ]
OperationCommand
Configure SDLC addresssdlc controller sdlc-address
Delete SDLC addressundo sdlc controller 
sdlc-address 
						

							388CHAPTER 25: CONFIGURING DLSW
partner shall be the MAC address of the remote end SNA equipment (physical 
addresses of such equipment as Ethernet and Token-Ring) or next-hop MAC 
address composed of SDLC.
Please process the following configurations in the synchronous interface view.
Ta b l e 436   Configure SDLC peer entity
By default, synchronous interface is not configured with SDLC peer entity.
Note the differences between the word digital order of Token-Ring and Ethernet. 
When configuring Token-Ring, you can configure it according to the address 
labeled on the equipment directly. When configuring Ethernet, you should reverse 
every Byte. For example, as to Ethernet MAC address, it should be configured to 
0007.3fc0.5a12 if the mark is 00e0.fc03.a548. Thereinto, the first byte 00 of 
00e0 is reversed as 00, the binary form of the second byte e0 is 11100000, 
after reversed, it is 00000111, that is 07 in hexadecimal form. Computed in this 
way, 3fc0 is reversed form of fc03, and 5a12 is the reversed form of 
a548.
10Configure XID of SDLC
XID is used to identify an identity of equipment in SNA. Generally, there are two 
kinds of equipment - PU2.0 and PU2.1.PU2.1 equipment is configured with XID 
and can show their identities each other by exchanging XID. PU2.0 equipment 
does not exchange XID and it does not include XID. Thus PU2.1 equipment does 
not need this command, but you have to specify a XID for PU2.0 equipment.
Please process the following configurations in the synchronous interface view.
Ta b l e 437   Configure XID of SDLC
By default, synchronous interface is not configured with XID of SDLC.
11Configure to Add the Sync Interface to Bridge Set
To allow the synchronous interface encapsulated with SDLC to participate in DLSw 
forwarding, you need to use this command to add SDLC interface to a Bridge set. 
The Bridge set on Ethernet interface takes part in the local forwarding, but the 
Bridge set configured in the SDLC only takes part in DLSw forwarding, that is, all 
of the data on it will be forwarded to TCP channels.
Please process the following configurations in the synchronous interface view.
Ta b l e 438   Add synchronous Interface to Bridge set
OperationCommand
Configure SDLC peer entitysdlc mac-map remote mac-addr 
sdlc-addr
Delete SDLC peer entityundo sdlc mac-map remote mac-addr 
sdlc-addr
OperationCommand
Configure XID of SDLCsdlc xid sdlc-address 
xid-number
Delete XID of SDLCundo sdlc xid sdlc-address
OperationCommand
Add synchronous interface to Bridge setbridge-set 
bridge-set-number
Delete the configuration of adding synchronous 
interface to Bridge setundo bridge-set 
bridge-set-number 
						

							Configuration of DLSw 389
12Configure to Stop Running DLSw
Please carry out the following configuration under overall view.
Ta b l e 439   Configure to stop running DLSw
By default, the system does not run DLSw protocol.
After using this command, the system will release all the dynamic resources but 
reserve the existing configuration.
13Configure Baud Rate of Sync Interface
All of the above commands are some of basic commands for configuring DLSw. 
SNA equipment have diversified sorts and quite differences in the factual 
environment. The following commands are some frequently used adjustment 
parameters used to make the different equipment compatible.
Please process the following configurations in the synchronous interface view.
Ta b l e 440   Configure baud rate of synchronous Interface
By default, the baud rate of the serial interface on SNA equipment is 9600bps.
14Configure Encoding Mode of Sync Interface
There are two kinds of encoding modes including NRZI and NRZ on the 
synchronous serial interface. The routers in our company generally use NRZ 
encoding mode, but the encoding mode of the serial ports in some SNA 
equipment uses NRZI. So you need to change the encoding of routers according to 
the encoding mode used by the connected equipment.
This command is used to change the encoding mode of synchronous serial 
interface.
Please process the following configurations in the synchronous interface view.
Ta b l e 441   Configure encoding mode of synchronous Interface
By default, the synchronous interface uses encoding mode NRZ.
15Configure Idle Time Encoding Mode of Sync Interface
The SDLC serial ports of the 3Com Router series of routers is identified with “7E” 
during the idle time, but all of the serial ports on some SDLC equipment use high 
level working status “1” during the idle time. To improve the compatibility with 
the equipment, you need to change the idle time encoding mode of the routers.
Please process the following configurations in the synchronous interface view.
OperationCommand
Enable running DLSwdlsw enable
Stop running DLSwundo dlsw enable
OperationCommand
Configure baud rate of synchronous interfacebaudrate baudrate
OperationCommand
Configure NRZI encoding mode of synchronous interfacecode nrzi
Delete NRZI encoding mode of synchronous interfaceundo code nrzi 
						

							390CHAPTER 25: CONFIGURING DLSW
Ta b l e 442   Configure Idle time encoding mode of synchronous Interface
By default, the synchronous interface uses encoding mode 7E.
Generally, the idle time encoding mode of synchronous interface doesnt need to 
be modified. You may need to configure this command when connecting AS/400, 
that is, to change the idle time encoding mode in order to accelerate the polling 
rate of AS/400.
16Configure Parameters of DLSw Timer
The values of various timers used when DLSw established virtual circuits can be 
modified by configuring DLSw protocol timer.
Please carry out the following configuration in system view.
Ta b l e 443   Configure parameters of DLSw timer
By default, cache seconds is 120; connected seconds is 300; keepalive 
seconds
 is 30; local-pending seconds is 10; remote-pending seconds is 30.
It is recommended that subscribers do not modify or configure the parameters of 
DLSw timers in the common conditions. 
17Configure Other Parameters of LLC2
aConfigure LLC2 Local Acknowledgement Delay Time
The message transmitted by SNA over Ethernet is LLC2 message. Some 
working parameters of LLC2 can be modified by configuring the commands 
related to LLC2.
LLC2 local acknowledgement delay time refers to max wait time of delay 
acknowledgement when receiving a piece of LLC2 data message.
Please process the following configurations in the Ethernet interface view.
Ta b l e 444   Configure LLC2 local acknowledgement delay time
By default, LLC2 local acknowledgement delay time is 100 ms.
bConfigure LLC2 Premature Acknowledgement Window
OperationCommand
Configure idle time encoding mode of synchronous 
interfaceidle-mark
Restore idle time encoding mode of synchronous 
interfaceundo idle-mark
OperationCommand
Configure parameters of DLSw timerdlsw timer [ cache seconds ] [ 
connected seconds ] [ keepalive 
seconds ] [ local-pending seconds ] 
[ remote-pending seconds ]
Restore the default value of each 
parameter of DLSw timerundo dlsw timer [cache | connected | 
keepalive | local-pending | 
remote-pending ]
OperationCommand
Configure LLC2 local acknowledgement delay timellc2 timer ack-delay 
mseconds
Restore the default value of LLC2 local acknowledgement delay 
timeundo llc2 timer 
ack-delay 
						

							Configuration of DLSw 391
LLC2 pre-answer refers to sending answer packet to the peer in advance after 
receiving the specified amount of packets. This parameter and local answer 
display time in 1 controls the time to send answer packet together. If any 
condition is satisfied, the answer packet will be sent, that is, it sends 
acknowledgement message to the other part in advance after receiving the nth 
message.
Please process the following configurations in the Ethernet interface view.
Ta b l e 445   Configure LLC2 premature acknowledgement window
By default, the length of LLC2 premature acknowledgement window is 3.
cConfigure LLC2 Local Acknowledgement Window
LLC2 adopts the window mechanism when sending packets, while not 
requiring the timely reply for each packet. LLC2 can wait for the replies from 
the peer at the same time after the whole window has been sent. LLC2 local 
acknowledgement window size is the Max. amount of packets that LLC2 can 
send before receiving the replies.
Please process the following configurations in the Ethernet interface view.
Ta b l e 446   Configure LLC2 premature acknowledgement window
By default, the length of LLC2 local acknowledgement window is 7.
dConfigure Modulo Value of LLC2
LLC2 uses modulo mode to number the information message like X25 
protocol. The modulo value is 8 or 128. Ethernet generally uses modulo 128.
Please process the following configurations in the Ethernet interface view.
Ta b l e 447   Configure modulo value of LLC2
By default, the modulo value of LLC2 is 128.
eConfigure Retransmission Number of LLC2
LLC2 retransmission number indicates the retransmission number of 
information frame before receiving no acknowledgement frame sent by the 
other part.
Please process the following configurations in the Ethernet interface view.
OperationCommand
Configure the length of LLC2 premature 
acknowledgement windowllc2 max-ack n
Restore the default length value of LLC2 premature 
acknowledgement windowundo llc2 max-ack
OperationCommand
Configure the length of LLC2 Premature Acknowledgement 
Windowllc2 receive-window 
length
Restore the default length value of LLC2 premature 
acknowledgement windowundo llc2 
receive-window
OperationCommand
Configure Modulo Value of LLC2llc2 modulo n
Restore the default value of LLC2 modulo valueundo llc2 modulo 
						

							392CHAPTER 25: CONFIGURING DLSW
Ta b l e 448   Configure retransmission number of LLC2
By default, the retransmission number of LLC2 is 20.
fConfigure LLC2 Local Acknowledgement Time
LLC2 local acknowledgement time refers to max wait time for waiting for the 
other parts acknowledgement after sending a piece of LLC2 data message.
Please process the following configurations in the Ethernet interface view.
Ta b l e 449   Configure LLC2 local acknowledgement time
By default, LLC2 local acknowledgement time is 200 ms.
gConfigure BUSY Status Time of LLC2
When it queries the station, LLC2 will wait for the next query if the station is 
busy.
The interval of re-querying LLC2 Busy station.
Please process the following configurations in the Ethernet interface view.
Ta b l e 450   Configure BUSY status time of LLC2
By default, BUSY status time of LLC2 is 300 ms.
hConfigure P/F Wait Time of LLC2
P/F wait time of LLC2 refers to duration waiting for correct information frame 
after sending frame P.
Please process the following configurations in the Ethernet interface view.
Ta b l e 451   Configure P/F wait time of LLC2
By default, P/F wait time of LLC2 is 5000 ms.
iConfigure REJ Status Time of LLC2
REJ status time of LLC2 refers to duration waiting for correct information frame 
after refusing frame.
Please process the following configurations in the Ethernet interface view.
OperationCommand
Configure retransmission number of LLC2llc2 max-transmission 
retries
Restore the default value of the retransmission number of 
LLC2undo llc2 
max-transmission
OperationCommand
Configure LLC2 Local Acknowledgement Timellc2 timer ack mseconds
Restore the default value of LLC2 local acknowledgement 
timeundo llc2 timer ack
OperationCommand
Configure BUSY status time of LLC2llc2 timer busy mseconds
Restore the default value of BUSY status time of LLC2undo llc2 timer busy
OperationCommand
Configure P/F wait time of LLC2llc2 timer poll mseconds
Restore the default value of P/F wait time of LLC2undo llc2 timer poll 
						

							Configuration of DLSw 393
Ta b l e 452   Configure REJ status time of LLC2
By default, REJ status time of LLC2 is 500 ms.
jConfigure Queue Length of Sending Message of LLC2
Please process the following configurations in the Ethernet interface view.
Ta b l e 453   Configure queue length of sending message of LLC2
By default, the queue length of sending message of LLC2 is 50.
18Configure Other Parameters of SDLC
aConfigure Queue Length of Sending Message of SDLC
Please process the following configurations in the synchronous interface view.
Ta b l e 454   Configure queue length of sending message of SDLC
By default, the queue length of sending message of SDLC is 50.
bConfigure SDLC Local Acknowledgement Window
SDLC Local Acknowledgement Window adopts the window mechanism when 
sending packets, while not requiring the timely reply for each packet. SDLC 
Local Acknowledgement Window can wait for the replies from the peer at the 
same time after the whole window has been sent. 
Please process the following configurations in the synchronous interface view.
Ta b l e 455   Configure SDLC local acknowledgement window
By default, the length of SDLC local acknowledgement window is 7.
cConfigure Modulo Value of SDLC
SDLC uses modulo mode to number the information message like X25 
protocol. The modulo value is 8 or 128. SDLC generally uses modulo 8.
Please process the following configurations in the synchronous interface view.
Ta b l e 456   Configure modulo value of SDLC
OperationCommand
Configure REJ status time of LLC2llc2 timer reject mseconds
Restore the default value of REJ status time of LLC2undo llc2 timer reject
OperationCommand
Configure queue length of sending message of LLC2llc2 max-send-queue length
Restore the default value of queue length of sending 
message of LLC2undo llc2 max-send-queue
OperationCommand
Configure queue length of sending message of SDLCsdlc max-send-queue length
Restore the default value of queue length of sending 
message of SDLCundo sdlc max-send-queue
OperationCommand
Configure the length of SDLC local acknowledgement 
windowsdlc window length
Restore the default length value of SDLC local 
acknowledgement windowundo sdlc window
OperationCommand
Configure Modulo Value of SDLCsdlc modulo n
Restore the default value of SDLC modulo valueundo sdlc modulo 
						

							394CHAPTER 25: CONFIGURING DLSW
By default, the modulo value of SDLC is 8.
dConfigure Maximum Receivable Frame Length N1 of SDLC
Maximum frame length of SDLC refers to byte number of maximum 
transmissible and receivable message, not including parity bit and stop bit.
Please process the following configurations in the synchronous interface view.
Ta b l e 457   Configure maximum receivable frame length of SDLC
By default, the maximum receivable frame length of SDLC is 265 bytes. 
Generally, the length is 265 for some PU2.0 equipment and 521 for IBM 
AS/400. We often need to configure our equipment to be of the same values 
as the connected SDLC equipment.
eConfigure Retransmission Number N2 of SDLC
The retransmission number N2 of SDLC refers to the retransmission number 
before receiving no acknowledgement packet sent by the other part.
Please process the following configurations in the synchronous interface view.
Ta b l e 458   Configure retransmission number of SDLC
By default, the retransmission number of SDLC is 20.
fConfigure Poll Time Interval of SDLC
Poll time interval of SDLC refers to wait time interval between two SDLC nodes 
polled by SDLC primary station.
Please process the following configurations in the synchronous interface view.
Ta b l e 459   Configure poll time interval of SDLC
By default, the poll time interval of SDLC is 100 ms.
gConfigure SAP address for transforming SDLC to LLC2
When transforming SDLC message to LLC2 message, it  needs both SAP and 
MAC addresses. This command is used to specify SAP address used when 
transforming LLC2 for a SDLC byte.
Generally, the SAP address used by SNA protocol is 0x04, 0x08 or 0x0C.
Please process the following configurations in the synchronous interface view.
OperationCommand
Configure Maximum Receivable Frame Length of SDLCsdlc max-pdu n
Restore the default value of maximum receivable frame 
length of SDLCundo sdlc max-pdu
OperationCommand
Configure retransmission number of SDLCsdlc max-transmission 
retries
Restore the default value of the retransmission 
number of SDLCundo sdlc max-transmission
OperationCommand
Configure poll time interval of SDLCsdlc timer poll mseconds
Restore the default value of poll time interval of SDLCundo sdlc timer poll 
						

							Configuration of DLSw 395
Ta b l e 460   Configure SAP address for transforming SDLC to LLC2
By default, both LSAP and DSAP of LLC2 are 04.
hConfigure Data Bi-directional Transmission Mode of SDLC
This command is used to allow the synchronous serial port of the encapsulated 
SDLC protocol to work in the bi-directional data transmission mode. In other 
words, you can restore the time to wait for a reply used by secondary station to 
the default value
Please process the following configurations in the synchronous interface view.
Ta b l e 461   Configure data bi-directional transmission mode of SDLC
By default, SDLC data uses bi-directional (alternate) transmission mode.
iConfigure Acknowledgement Wait Time T1 of SDLC Primary Station
Acknowledgement wait time T1 of primary station refers to the duration that 
the primary station waits for acknowledgement from secondary station after 
sending information frame.
Please process the following configurations in the synchronous interface view.
Ta b l e 462   Configure acknowledgement wait time T1 of SDLC primary station
By default, the acknowledgement wait time T1 of SDLC primary station is 
configured to be 3000 ms.
jConfigure Acknowledgement Wait Time T2 of SDLC Secondary Station
Acknowledgement wait time T2 of secondary station refers to the duration 
that the secondary station waits for acknowledgement from primary station 
after sending information frame.
Please process the following configurations in the synchronous interface view.
OperationCommand
Configure local SAP address for transforming SDLC to 
LLC2sdlc sap-map local lsap 
sdlc-addr
Restore the default value of local SAP address for 
transforming SDLC to LLC2undo sdlc sap-map local 
lsap
Configure remote SAP address for transforming SDLC 
to LLC2sdlc sap-map remote dsap 
sdlc-addr
Restore the default value of remote SAP address for 
transforming SDLC to LLC2undo sdlc sap-map remote 
dsap
OperationCommand
Configure data bi-directional transmission mode of 
SDLCsdlc simultaneous
Delete data bi-directional transmission mode of SDLCundo sdlc simultaneous
OperationCommand
Configure acknowledgement wait time T1 of SDLC 
Primary Stationsdlc timer ack mseconds
Restore the default value of acknowledgement wait 
time of SDLC primary stationundo sdlc timer ack 
						

							396CHAPTER 25: CONFIGURING DLSW
Ta b l e 463   Configure acknowledgement wait time T2 of SDLC secondary station
By default, the acknowledgement wait time T2 of SDLC secondary station is 
configured to be 500 ms.
Display and Debug 
DLSwTa b l e 464   Display and debug DLSw
Ty p i c a l  D L S w  
Configuration 
Example
DLSw Configuration of 
LAN-LANI. Networking Requirement
LAN-LAN working mode is used. The two running SNA and LAN are connected by 
IP across WAN.
OperationCommand
Configure acknowledgement wait time T2 of SDLC 
secondary stationsdlc timer lifetime 
mseconds
Restore the default value of acknowledgement wait 
time T2 of SDLC secondary stationundo sdlc timer lifetime
OperationCommand
Display interface Bridge set informationdisplay dlsw bridge-entry
Display performance exchange informationdisplay dlsw information [ 
local ] [ ip-address 
ip-address ]
Display Information about DLSw circuits running in the 
routerdisplay dlsw circuits [ 
circuit-id ] [verbose]
Display remote end peer entity informationdisplay dlsw remote [ 
ip-address ip-address ]
Clear entry buffer memory information of Bridge setreset dlsw circuits [ 
circuit-id ]
Clear virtual circuit informationdebugging dlsw circuit
Open debugging information switch of DLSw virtual 
circuitdebugging dlsw core
Open debugging information switch of DLSw status 
machinedebugging dlsw event
Open debugging information switch of DLSw abnormal 
eventsdebugging dlsw packet
Open debugging information switch of DLSw messagesdebugging dlsw tcp
Open debugging information switch of DLSw peer 
entitydebugging sdlc event
Open debugging information switch of SDLC eventsdebugging sdlc packet
Open debugging information switch of SDLC messagesdisplay dlsw bridge-entry