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ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

Welcome to the Cisco Networking Professionals Ask the Expert conversation. This is an opportunity to discuss Internetworking SNA with Cisco Solutions with Cisco expert Dixon Ho. Dixon’s current responsibilities include Technical Assistance Center (TAC) Escalation in which he troubleshoots complex issues in DLSw, SDLC, LLC2, transparent bridging, source-route bridging, bisync, APPN, SNASw, and CIP. Feel free to post any questions relating to Internetworking SNA with Cisco Solutions. Remember to use the rating system to let Dixon know if you’ve received an adequate response.

Dixon might not be able to answer each question due to the volume expected during this event. Our moderators will post many of the unanswered questions in other discussion forums shortly after the event. This event lasts through August 15. Visit this forum often to view responses to your questions and the questions of other community members.

18 REPLIES
New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

TXD not working on CISCO805 router.

Ethernet and Serial from up change state to down. line protocol is down. When I switch on cisco805 on 10sec shows txt then it desapear.message like this:

00:03:49 %LINK-3-UPDOWN; Int Serial0, change start to down.

or telling me: unit0, lostcarrier

On begining telling me

auto boot: failed "no such file" then going

Booting "C805-y6-mw"...,

What to do? Is my router o.k. but need someone to fix it! configuration file is o.k. since guy from ISP send it to me conf.file which I include inside.

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

What is TXD?

The error messages "unit0, lostcarrier" + "%LINK-3-UPDOWN; Int Serial0, change start to down" mean that the serial interface loses DCD, which is provided by DCE. What is connecting to the serial interface? If the serial interface is connecting to a telco circuit, you need to ask the telco/ISP to check the circuit. Alternatively, you can insert a breakout box and monitor the DCD.

The second set of error messages (i.e. auto boot: failed "no such file" then going Booting "C805-y6-mw"...,) seem to be fine. The router cannot find the first file. Eventually, it finds c805-y6-mw. Another way to verify it is the command command. If an IOS is not loaded on the router, the command prompt looks like xxx(BOOT).

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

How can i keep the dial back up interface down when there is no user data by DLSw on DDR over dial back up?

I configure remote router as DLSw Dial on Demand over Dial Back up as follows:

dlsw local-peer peer-id 10.100.16.29

dlsw remote-peer 0 tcp 10.10.40.29 keepalive 0 timeout 5 dynamic inactivity 2

dlsw bridge-group 10

dlsw netbios-keepalive-filter

access-list 101 permit tcp any eq 2065 any

access-list 101 permit tcp any any eq 2065

dialer-list 1 protocol ip list 101

When there is no user data, dial back up interface still stays up. I think LLC2 packets trigger the dialer list. How can i solve this problem?

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

Hi,

A couple of questions. Do you configure keepalive 0 or dlsw prom-peer-default on the remote peer?

Are there any LLC1 packets on the ethernet interface? Can you try DLSw icanreach sap 4 f0? This should eliminate all LLC1 traffic.

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I've already configured keepalive 0. After your suggestion, i try DLSw icanreach sap 4 F0 at central router. But problem is not solved.

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

Can you send me the following output to dixho@cisco.com please?

1. show tech (while the LLC2 circuit is idle)

2. show dlsw peer (multiple times)

Can you run debug dlsw for a couple of seconds or so?

Anonymous
N/A

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

Hi Expert

I am suk and we have a Cisco 3600 Series Router with two Fast ethernet card and one serial Interface Card and from last two weeks are facing one serious problem of CPUHOG.

Can you please advise me any workaround for this problem.

The message that we are getting at our end at console is

-Traceback= 604EB880

1w0d: %SYS-3-CPUHOG: Task ran for 2228 msec (10/0), process = IP Input, PC = 604

EB878.

Waiting for your reply

Thanks in advance

Sukrut

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I do not have enough information to give you a workaround. The error message means that the router CPU (Route Processor) sends 2 second on the process called IP Input. IP Input is called when the router is process switched an IP packet. IP Input should not run for 2 second. It looks like to me that this is a software bug.

I think that you need to open a TAC case. The TAC engineer requires a show version to decode the traceback. From the traceback, the TAC engineer may able to identify a bug. If not, I think that you need to look at the interface buffer and find out the packet causes the problem.

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

Hi,answer please. Catalyst 4006, Sup II, CatOS don't loading WEB interface, working without reset

ASU-4006> (enable) sh flash

error = -14

Open device bootflash failed (no more file records)

ASU-4006> (enable) sh boot

BOOT variable = bootflash:cat4000_6-1-2.bin,1;bootflash:cat4000.6-3-1.bin,1;

CONFIG_FILE variable = bootflash:switch.cfg

Configuration register is 0x2

ignore-config: disabled

auto-config: non-recurring

console baud: 9600

boot: image specified by the boot system commands

ASU-4006> (enable) sh flash devices

bootflash

ASU-4006> (enable) sh flash 1/bootflash: filesys

-------- F I L E S Y S T E M S T A T U S --------

Device Number = 0

DEVICE INFO BLOCK:

Magic Number = 6887635 File System Vers = 10000 (1.0)

Length = f80000 Sector Size = 20000

Programming Algorithm = 6 Erased State = ffffffff

File System Offset = 40000 Length = f00000

MONLIB Offset = 100 Length = 2d864

Bad Sector Map Offset = 3fff0 Length = 10

Squeeze Log Offset = f40000 Length = 20000

Squeeze Buffer Offset = f60000 Length = 20000

Num Spare Sectors = 0

Spares:

STATUS INFO:

Writable

NO File Open for Write

Complete Stats

No Unrecovered Errors

No Squeeze in progress

USAGE INFO:

Bytes Used = 5a3f8c Bytes Available = 95c074

Bad Sectors = 0 Spared Sectors = 0

OK Files = 2 Bytes = 5a3e8c

Deleted Files = 0 Bytes = 0

Files w/Errors = 0 Bytes = 0

ASU-4006> (enable) sh test 1

Diagnostic mode (mode at next reset: complete)

Module 1 : 2-port 1000BaseX Supervisor

POST Results

Network Management Processor (NMP) Status: (. = Pass, F = Fail, U = Unknown)

Galaxy Supervisor Status : .

CPU Components Status

Processor : .

DRAM : .

RTC : .

EEPROM : .

FLASH : .

NVRAM : .

Temperature Sensor : .

Uplink Port 1 : .

Uplink Port 2 : .

Me1 Status : .

EOBC Status : .

SCX1000 - 0

Register : .

Switch Sram : .

Switch Gigaports

0: . 1: . 2: . 3: .

4: . 5: . 6: . 7: .

8: . 9: . 10: . 11: .

SCX1000 - 1

Register : .

Switch Sram : .

Switch Gigaports

0: . 1: . 2: . 3: .

4: . 5: . 6: . 7: .

8: . 9: . 10: . 11: .

SCX1000 - 2

Register : .

Switch Sram : .

Switch Gigaports

0: . 1: . 2: . 3: .

4: . 5: . 6: . 7: .

8: . 9: . 10: . 11: .

ASU-4006> (enable)

ASU-4006> (enable) sh version

WS-C4006 Software, Version NmpSW: 6.3(1)

Copyright (c) 1995-2001 by Cisco Systems, Inc.

NMP S/W compiled on Jul 24 2001, 12:55:29

GSP S/W compiled on Jul 24 2001, 10:36:29

System Bootstrap Version: 5.4(1)

Hardware Version: 1.3 Model: WS-C4006 Serial #: JAB050505ZM

Mod Port Model Serial # Versions

--- ---- ---------- -------------------- ---------------------------------

1 2 WS-X4013 JAB050505ZM Hw : 1.3

Gsp: 6.3(1.0)

Nmp: 6.3(1)

2 14 WS-X4412-2GB-T JAE044403FB Hw : 1.0

3 48 WS-X4148 JAB034502ZR Hw : 1.6

4 48 WS-X4148-RJ JAB054805HK Hw : 3.0

5 48 WS-X4148-RJ JAE0607059E Hw : 3.0

6 0 WS-X4019 JAB052705PK Hw : 1.0

DRAM FLASH NVRAM

Module Total Used Free Total Used Free Total Used Free

------ ------- ------- ------- ------- ------- ------- ----- ----- -----

1 65536K 35824K 29712K 16384K 6801K 9583K 480K 246K 234K

Uptime is 665 days, 15 hours, 32 minutes

ASU-4006> (enable) cd bootflash

Missing colon for device id bootflash

ASU-4006> (enable) whichboot

Boot image name is 'bootflash:cat4000.6-3-1.bin'.

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

From the submitted information, I do not know the files in the bootflash. Please do a show bootflash and find out the files in the bootflash.

From show version, it looks like that the switch runs cat4000.6-3-1.bin. You need a software with CiscoView feature. (i.e. the file name with a cv. For example, cat4000-cv.6-3-2a.bin)

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

Hi, show boot and show flash are different commands in CatOS 6.3(1), so on another switch Catalyst 4006 it look

REZERV-4006> (enable) sh boot

BOOT variable = bootflash:cat4000_6-1-2.bin,1;bootflash:cat4000.6-3-1.bin,1;

CONFIG_FILE variable = bootflash:switch.cfg

Configuration register is 0x2

ignore-config: disabled

auto-config: non-recurring

console baud: 9600

boot: image specified by the boot system commands

REZERV-4006> (enable) sh flash

-#- ED --type-- --crc--- -seek-- nlen -length- -----date/time------ name

1 .. ffffffff 4e88958b 42a97c 17 4106492 Sep 30 2001 20:56:08 cat4000.6-3-

1.bin

2 .. ffffffff 60d9442a 5e3f8c 20 1807758 Sep 30 2001 20:59:55 cat4000-cv.6

-2-2.bin

3 .. ffffffff 8fc816d4 5e5668 11 5722 Aug 07 2003 09:24:57 rezerv-4006

9808280 bytes available (5920360 bytes used)

The file name was renamed since upgrade and WEB interface was OK all time, but now there is no access to flash memory. I want to write configuration to flash

ASU-4006> (enable) copy config flash

This command uploads non-default configurations only.

Use 'copy config flash all' to upload both default and non-default configuration

s.

Flash device [bootflash]?

Name of file to copy to [ASU-4006.cfg]?

Upload configuration to bootflash:ASU-4006.cfg

9814004 bytes available on device bootflash, proceed (y/n) [n]? y

.............

..................

..................

....................

....................

....................

..

error = -14

file bootflash:ASU-4006.cfg cannot be opened for write (no more file records)

Cannot write buffer to file

Cannot copy from config: to bootflash:ASU-4006.cfg

ASU-4006> (enable)

I want to know is this problem ended with formatting flash and upgrading to new version software or it is hardware error.

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I am not a Catalyst switches expert. This section is mainly for SNA.

Based on the information, I think that you either have a bad flash or the flash memory is not formatted properly. I suggest you to format the flash first. If the problem is not fixed, please open a TAC case and ask for a RMA.

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

At present we have a connection to a remote site, using a Cisco 3725 at the remote end, it has 3 WIC 2T,on which we have 5 stun connections and the WAN link to the central site. At the central site we have a Cisco 3640 with a four port serial and a multifunction card with a WIC2T.

The back up solution to this is a second set of routers with an ISDN connection.

We have configured floating static routes to activate the ISDN and reroute the STUN connections.

Some of the Servers on the STUN connections require loose the connection when the link trips over to ISDN what would your method be of resolving this?

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I would like to check the following:

1. When the primary WAN connection is gone, is there a route on the STUN router to the remote STUN peer?

2. Is there an access list on the ISDN interface?

If there is no access list on the ISDN interface, an extended ping which use source IP address as the STUN peer ID is a good test.

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I am trying to bridge ethernet into my SNASw router. This ethernet will not utilize DLSW, but I would like it to find the SNASw MAC on my defined SNASw downstream port. Can this be done?

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I am sorry that I do not understand your question. Can you provide the router configuration? Also, can you rephrase your question please? Thanks

New Member

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

I have a RS6000 which is downstream/lan attached to my SNASw router via Fast Ethernet Interface. This RS6000 needs to have SNA access to the Mainframe. I would like to have the RS6000 utilize the SNASw functionality upstream to the mainframe. Because the RS6000 is lan attached, we will only be passing a MAC address to the SNA Switch, right? I am looking for some assistance as to how to code my SNA Switching router with regard to the Fast Ethernet interface AND my SNASw commands. I have tried coding a standby mac address in my FastEthernet interface (and have the RS6000 use that MAC) and a port defintion in my SNASw, but that does not appear to be working. **the RS6000 cannot connect to the mainframe

Silver

Re: ASK THE EXPERT- INTERNETWORKING SNA WITH CISCO SOLUTIONS

A number of comments:

1. Standby MAC address only works if the router is the active HSRP router.

2. Can you do a show snasw link please? Is there is SNASw link between the SNASw router and the RS6000?

3. You need to define a SNASw link to the mainframe. Have you done that? Again, please do a show snasw link and confirm that there is a snasw link between the snasw router and the host.

One final comment. Please do a show snasw session and show snasw rtp. For ISR links, there should be at least 2 sessions (CP-CP session) per ISR link.

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