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14.3.6 Control the Buffer Size
You can control the buffer size on the router. The buffer holds data that is pending transmission to a
remote SDLC station. This command is particularly useful in the case of the SDLLC media translator,
which allows an LLC2-speaking SNA station on a Token Ring to communicate with an SDLC-speaking
SNA station on a serial link. The frame sizes and window sizes on Token Rings are often much larger
than those acceptable for serial links, and serial links are often slower than Token Rings.
To control backlogs that can occur during periods of high data transfer from the Token Ring to the serial
line, use the following command in interface configuration mode on a per-address basis:
sdlc holdqueue address queue-size
Select 28 item from listing, display:
(00)K
......
(05)holdqueue
......
Please Input the code of command to be excute(0-16): 5
Input 5，select holdqueue item ，display：
(00)<1-FE>
Please Input the code of command to be excute(0-0): 0
Input 0，display：
Please input a digital number:Please input a string:
Input address，display：
(00)<0-65535>
Please Input the code of command to be excute(0-0): 0
Select 0，and input queue-size。
14.3.7 Control Polling of Secondary Stations
You can control the intervals at which the router polls secondary stations, the length of time a primary
station can send data to a secondary station, and how often the software polls one secondary station
before moving on to the next station.
Keep the following points in mind when using these commands:
Secondary stations cannot transmit data until they are polled by a primary station. Increasing the
poll-pause timer increases the response time of the secondary stations. Decreasing the timer can flood
the serial link with unneeded polls, requiring secondary stations to spend wasted CPU time processing
them.
Increasing the value of the poll limit allows for smoother transactions between a primary station and a
single secondary station, but can delay polling of other secondary stations.
To control polling of secondary stations, use one or more of the following commands in interface
configuration mode:
sdlc poll-pause-timer milliseconds
sdlc poll-limit-value count
st
Take the 1
command as an example
Select 28 item from listing, display:
(00)K
......
Model Name
Command
The size of the sending window
the max queue length
SDLC Address in Hex
Queue size
Command
The size of the sending window
Set the maximum number of packets held in queue
before transmitting.
Set the length of time the router pauses between sending
each poll frame to secondary stations on a single serial
interface.
Set how many times a primary station will poll a
secondary station.
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