📄 sdlc-tg fep local ack.htm
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<h1>SDLC -tg FEP-FEP With Local Ack -- Sample Configuration</h1>
<hr>
<h2>Scenario</h2>
<p>The customer has two Comten Front End Processors -- one in the
USA and the other in France. The customer would like to connect
them via Cisco routers. Initial setup was to use <b>stun route
all</b>. This was unsuccessful as the FEPs were constantly timing
out. One of the Comten FEPs was not retrying the number of times
it was configured for. Consequently, the sessions timed out. The
customer decided to use local-ack upon recommendation by Cisco. </p>
<h2>Sample Configuration</h2>
<p>The following is a sample configuration for FEP to FEP using
local-ack. </p>
<p>System Image 9.1.8 and above is required. </p>
<h3>Network Topology</h3>
<pre>
-
- -
- -
FEP ---- 19.2 -S1- 4000 -E0-- IP CLOUD --E0- 4000 -S2- 19.2 ---- FEP
F_Sec R_Pri - - R_Sec F_Pri
- -
-
</pre>
<p>FEP - Front End Processor (37X5) 4000 - Cisco 4000 Router
F_Pri - FEP acting as primary F_Sec - FEP acting as secondary
R_Pri - Router acting as primary R_Sec - Router acting as
secondary Sx - Serial Port x Ex - Ethernet Port x </p>
<h3>Configurations</h3>
<pre>
Current configuration:
version 9.1
!
hostname ROUTER_PRIMARY
!
!
boot system flash xx-k.91-8.2.Z
boot system rom
!
!
buffers big min-free 10
buffers large max-free 40
buffers large min-free 20
!
!
stun peer-name 161.131.40.1
stun remote-peer-keepalive
stun protocol-group 1 sdlc-tg
!
!
interface Ethernet 0
ip address 161.131.40.1 255.255.255.0
no mop enabled
!
!
interface Serial 1
mtu 4400
no ip address
hold-queue 150 in
encapsulation stun
stun group 1
stun sdlc-role primary
sdlc line-speed 19200
sdlc n1 35200
sdlc address 04 echo
stun route address 4 tcp 156.28.11.1 local-ack clockrate 19200
</pre>
<p>************************ </p>
<pre>
Current configuration:
version 9.1
!
hostname ROUTER_SECONDARY
!
!
boot system flash xx-k.91-8.2
boot system rom
!
!
buffers big min-free 10
buffers large max-free 40
buffers large min-free 20
stun peer-name 156.28.11.1
stun remote-peer-keepalive
stun protocol-group 1 sdlc-tg
!
!
interface Ethernet 0
ip address 156.28.11.1 255.255.255.0
no mop enabled
!
!
interface Serial 2
mtu 4400
no ip address
hold-queue 150 in
encapsulation stun
stun group 1
stun sdlc-role secondary
sdlc n1 35200
sdlc address 04 echo
stun route address 4 tcp 161.131.40.1 local-ack
</pre>
<h3>Notes</h3>
<ol>
<li><pre>stun remote-peer-keepalive [secs]
</pre>
<p>For synchronization of peers the default is 30
seconds, and three attempts. This is only sent when there
is no I-Frame traffic between NCPs. </p>
</li>
<li><pre> stun protocol-group [number] sdlc-tg
</pre>
<p>This has to be enabled for a SDLC broadcast address,
such as xFF. This also performs the TG reroute function
and must be used with local-ack. </p>
</li>
<li><pre> MTU [number]
</pre>
<p>Specify MTU greater than NCPs max data MTU
(buffers*transfer, maxdata). 4400 is the highest
recommended for stun interface. </p>
</li>
<li><pre>sdlc n1 [number]
</pre>
<p>Required if MTU is not 1500 and recommended to be
eight times MTU. </p>
</li>
<li><pre> hold-queue [number] in
</pre>
<p>Increases the hold queue from 75 to 150. </p>
</li>
<li><pre>sdlc line-speed [number]
</pre>
<p>This is for the SDLC Primary Router and poll-timer
adjustment. Set it to the line speed of stun interface.
(DTE or DCE) </p>
</li>
<li><pre>sdlc address [number] echo
</pre>
<p>Echo treats non-echo (eg. x04) and echo (eg. x84) as
the same addresses. It is only valid for sdlc-tg
interfaces. Only one <b>sdlc address</b> with <b>echo</b>
option per interface is required. </p>
</li>
<li><pre>stun route address [number] tcp [ip address] local-ack
</pre>
<p>Local-ack and TCP must be specified for sdlc-tg.
Specify the address number with echo bit off (eg. x04).
There is no need to specify broadcast address (xFF). </p>
</li>
<li><pre> clockrate
</pre>
<p>This is only for DCE. Also, use the
transmit-clock-internal for 7000. </p>
<pre>
</pre>
</li>
<li>buffers [type] min-free [size] buffers [type] max-free
[size] <p>They must be tuned for 4000 and 7000 platforms
for stun. Contact the Technical Assistance Center. </p>
<p>When tuning buffers, administratively shut down the
stun interface first. </p>
</li>
</ol>
<h3>Other Options</h3>
<ol>
<li><pre>stun cos-enable
</pre>
<p>For SNA network prioritization - Class of Service.
This must be used in conjunction with <b>priority</b>
keyword on <b>stun route ...</b> </p>
</li>
<li><pre>
priority-list [number]
priority-group [list]
</pre>
<p>Priority-queuing mechanism. </p>
<p>Administratively shut down the stun interfaces while
configuring for priority-queuing. </p>
</li>
</ol>
<h3>Show interface</h3>
<pre>
Sh int s 2 (stun secondary interface)
</pre>
<p>Serial 2 is up, line protocol is up Hardware is MK5025
Description: Router_Secondary MTU 4400 bytes, BW 1544 Kbit, DLY
20000 usec, rely 255/255, load 1/255 This end is the secondary
station. Poll Timers (msec): wait 40000 [N1 35200, K 7] timer:
66421396 </p>
<p>--More SDLC information for this interface-- </p>
<pre>
SDLC addr 4 state is CONNECT
VS 1, VR 1, RCNT 0, Remote VR 1, Current retransmit count 0
Hold queue: 0/50 IFRAMEs 247/255
RNRs 0/0 SNRMs 0/106 DISC/RDs 0/0 REJs 0/0 chain: 04/04
Last input 0:01:05, output 0:00:00, output hang never
Last clearing of "show interface" counters 0:00:27
Output queue 0/40, 0 drops; input queue 0/150, 0 drops
Five minute input rate 0 bits/sec, 5 packets/sec
Five minute output rate 0 bits/sec, 5 packets/sec
137 packets input, 274 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
137 packets output, 274 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets, 0 restarts
0 carrier transitions
</pre>
<h3>Sh Stun</h3>
<pre>
Router_Secondary#sh stun
</pre>
<p>This peer: 156.28.11.1 </p>
<p>*Serial2 -- Internet/LS transfix 19.2kbs (group 1 [sdlc-tg])
state l rx_pkts tx_pkts drops poll 4 TCP 161.131.40.1 open * 3387
12487 297 </p>
<p>SDLC Local Acknowledgement: </p>
<p>Serial2 -- Internet/LS transfix 19.2kbs (group 1 [sdlc-tg])
slack_state conn disc iframe_s iframe_r 4 TCP 161.131.40.1 Active
7 209 247 255 </p>
<p>******************************** </p>
<pre>
Router_Primary#sh stun
</pre>
<p>This peer: 161.131.40.1 </p>
<p>*Serial1 (group 1 [sdlc-tg]) </p>
<p>state l rx_pkts tx_pkts drops poll 4 TCP 156.28.11.1 open *
680 823 0 </p>
<p>SDLC Local Acknowledgement: </p>
<p>*Serial1 (group 1 [sdlc-tg]) slack_state conn disc iframe_s
iframe_r 4 TCP 156.28.11.1 Active 96 189 152 153 </p>
<hr>
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