Connecting ethernet to token ring

I'm having trouble trying to configure cisco 2612 router to connect SNA server to datacenter host. please refer to connectivity below.
SNA server--eth----router--t/r--control unit--modem-SDLC---modem---FEP
the controller unit has token ring card installed on it and it's connected to router's t/r port..i configured the router with SR/TLB but no success, what we did we temporarily removed the router and add token ring adapter on the same SNA server then connect direct to control unit and it's work but we need to implement the connectivity shown above..thanks

Hi Matthias,
working topology:SNA server with 2 NIC ethenet and T/R
--eth-SNA-t/r---control unit-modem--sdlc--modem--FEP
with router:not working
SNA-eth-router-t/r-control unit-modem-sdlc-modem-FEP
please checked the router config below, thanks
Current configuration : 686 bytes
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname Router
enable secret 5
ip subnet-zero
no ip routing
source-bridge ring-group 20
source-bridge transparent 20 10 2 5
interface Ethernet0/0
ip address 10.10.50.2 255.255.255.0
no ip route-cache
bridge-group 2
interface TokenRing0/0
no ip address
no ip route-cache
ring-speed 16
source-bridge 5 2 20
ip default-gateway 10.10.50.1
ip classless
ip http server
bridge 2 protocol ieee
bridge 2 bitswap-layer3-addresses
line con 0
line aux 0
line vty 0 4
password
login
Ethernet0/0 is up, line protocol is up
Hardware is AmdP2, address is 000e.3853.fae0 (bia 000e.3853.fae0)
Internet address is 10.10.50.2/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 1000 bits/sec, 2 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
3789 packets input, 364786 bytes, 0 no buffer
Received 2964 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
354 packets output, 39668 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
TokenRing0/0 is up, line protocol is up
Hardware is HAWKEYE, address is 0070.1cca.5f87 (bia 0070.1cca.5f87)
MTU 4464 bytes, BW 16000 Kbit, DLY 630 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation SNAP, loopback not set
Keepalive set (10 sec)
ARP type: SNAP, ARP Timeout 04:00:00
Ring speed: 16 Mbps
Duplex: half
Mode: Classic token ring station
Full duplex capable
Source bridging enabled, srn 5 bn 2 trn 20 (ring group)
spanning explorer disabled
Group Address: 0x00000000, Functional Address: 0x0800011A
Ethernet Transit OUI: 0x000000
Last Ring Status 00:05:14 (0x2000)
Last input 00:00:00, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 1000 bits/sec, 1 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
2794 packets input, 449251 bytes, 0 no buffer
Received 962 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
390 packets output, 31117 bytes, 0 underruns
0 output errors, 0 collisions, 8 interface resets
0 output buffer failures, 0 output buffers swapped out
0 transitions

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DLSw over WAN to Ethernet to Token Ring

Currently, a 3745 in Portland is token ring attached and SNA traffic travels that ring to an IBM 2210 router.
That IBM router connects to a second token ring, which a Cisco 2613 is also connected to. From there
the traffic travels DLSw over the WAN (3 T1s, Multilink PPP bundle) to a 7507 in Cincinnati where a 3745
is connected via serial.
3745-TIC<->TR<->2210<->TR<->2613(DLSw)<->WAN<->(DLSw)7507<->LIC-3745
The 7507 serial port is configured as follows:
interface Serial4/3
description 3745 LIC connection for Fred Meyer DLSW
mtu 4400
no ip address
encapsulation sdlc
no ip mroute-cache
no keepalive
serial restart-delay 0
clockrate 125000
sdlc vmac 4000.3745.0000
sdlc N1 35200
sdlc address 29 seconly
sdlc partner 4000.0910.0008 29
sdlc dlsw 29
The 2613 has an ethernet. The folks in Portland want to move off of the TR and on to Ethernet.
They will replace the IBM router with one that has both TR and ENET.
If we move to the ethernet, the result will be:
3745-TIC<->TR<->2210<->ENET<->2613(DLSw)<->WAN<->(DLSw)7507<->LIC-3745
Should I change the MTU size on the serial port to 1500 (Ethernet)?
Are there any changes that should occur on the 3745/Mainframe side?
Do you see any other issues?

You cannot increase the MTU for ethernet larger than 1500 bytes because 802.3 (the standard for ethernet) does not allow that.
You may see issues. The problem is that both 3745 does not know the existance of the ethernet. If either 3745 sends a packet larger than 1500 bytes, the 2613 will drop the packet. (I am not an expert on 2210, I do not know if the 2210 is smart enough to segment the SNA packet into 2. I doubt it does, but please confirm it with IBM.) This causes the remote FEP detects a gap in SDLC, LLC2, or TH sequence number. No matter which layer detects the problem. The end result is still the same. The DLSw circuit will be disconnected.
There are several suggestions to your problem:
1. Make sure the both FEP will not send any PIU larger than 1500 bytes. This can be done either on the NCP gen or modtab. Checking the modtab is tough because your system programmers have to know all application running over the link. Then, they have to check the corresponding modtab entry for the applications.
2. run DLSw between 7507 to IBM 2210
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SNA Server on Ethernet cannot talk to AS/400 on token ring

We have an SNA server on Ethernet and it cannot talk to a token ring device Q159462 from microsoft suggests to disable LLC local Acknowledgement.
Does anyone have any suggestions and how can I disable LLC?

You can do DLSw FST. I do not find an example of FST. The configuration guide for FST is as follows:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart2/bcfdlsw.htm#1002472
Basically, it has a very similar configuration as TCP encaupsulation. Just replace "TCP" by "FST" in the dlsw remote-peer statements.
Please note that FST does not offer segmentation/fragmentation. If the LLC2/DLC frames are larger than 1400+ bytes, the router just drops the packets. Make sure that the token ring stations do not send packets larger 1400+ bytes.
For your information, RIF passthrough is another useful option. Please note that RIF pass through DOES NOT support token ring to ethernet, as documented in the following URL:
http://www.cisco.com/warp/public/cc/pd/ibsw/ibdlsw/tech/dls24_rg.htm
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I have a network set up at work with 2 MAC PROs, an iMAC and a partitioned DROBO NAS connected via token ring. The Partitioned DROBO is connected to MAC 3 via ISCSI. An alias for each of the drobo partitions was created on the desktop of MAC 3. Mac 2 and 1 on the network can connect to partition one of the drobo, labled NUMBER 1, however the alias for partition 2, "NUMBER 2" is sending MAC 1 and MAC 2 to their internal hard drives. I have checked the alias for NUMBER 2 and it is pointing to the right location. I have checked the permissions for "NUMBER 2" and they mirror the NUMBER 1 drobo partition. At this point I am at a loss and any help that can be given would be appreciated. Thank you ahead of time.

Won't you share some more details of what the problem (and the solution) turned out to be?
Some readers attempt to find answers to the same problem, and do a search. If they turn up your post, there could be more insight to help them solve their problem, but you have not included any.

DLSw Token Ring to Ethernet - Remote Peer MAC

Hi,
Refer to following link, http://www.cisco.com/en/US/partner/tech/tk331/tk336/technologies_configuration_example09186a0080093ecd.shtml
If there is host attached Ring 500 with MAC 0000.1111.0000 (non-canonical) ,another host attached to router B E0, MAC 0000.2222.0000 (canonical)
1) If I configure dlsw mac-address command at router A , should the MAC address configure should change non-canonical ?
2) If I want to configure dlsw mac-address command at router B , is the configure MAC address remain as non-canonical ?
May be you can explain more about the scenerio about when or where to bit swap the MAC address of configuration.
Best Regards.

Hi,
I get confusing. To make it simple I include the config and example.
Assume Token ring host is non-canonical and ethernet host is canonical. Please refer R1 & R2 config at the end.
Regards.
Scenario 1
Token Ring Host ---- R1 ===DLSW=== R2 ----Ethernet Host
(Answer)
XXXX.XXXX.XXXX - should convert to non-canonical
YYYY.YYYY.YYYY - remain non-canonical
Scenario 2
Ethernet Host ---- R1 ====DLSW==== R2 --------Ethernet Host
(Answer)
XXXX.XXXX.XXXX - should convert to non-canonical
YYYY.YYYY.YYYY - should convert to non-canonical
OR ?
XXXX.XXXX.XXXX - remain canonical
YYYY.YYYY.YYYY - remain canonical
which one ??
Best Regards.
R1
dlsw local-peer peer-id 1.1.1.2
dlsw remote-peer 0 tcp 1.1.1.1
dlsw mac-addr XXXX.XXXX.XXXXX remote-peer ip-address 1.1.1.1
R2
dlsw local-peer peer-id 1.1.1.1
dlsw remote-peer 0 tcp 1.1.1.2
dlsw mac-addr YYYY.YYYY.YYYY remote-peer ip-address 1.1.1.2

How to handle DLSw for SDLC and token-ring to same remote peer

We have the need to have SDLC and token-ring connections from one local router to a the same remote site. Currently we have a remote peer for token-ring:
dlsw port-list 10 TokenRing0/0
dlsw remote-peer 10 tcp a.b.c.d lf 1500
We have an SDLC link on a serial port. I understand that SDLC is part of group 0. How do I also get the SDLC traffic to the same remote peer? Is it as simple as adding another remote peer statement to the same IP?
dlsw remote-peer 0 tcp a.b.c.d lf 1500

Do you have your token ring configuration complete to bridge to DLSW ?
for example;
source-bridge ring-group 2000
dlsw local-peer peer-id 150.150.10.1
dlsw remote-peer 0 tcp 150.150.10.2
interface loopback 0
ip address 150.150.10.1 255.255.255.0
interface serial 0
ip address 150.150.11.1 255.255.255.192
interface serial 1
description PU2 with SDLC station role set to secondary
no ip address
encapsulation sdlc
no keepalive
clockrate 9600
sdlc role primary
sdlc vmac 4000.9999.0100
sdlc address 01
sdlc xid 01 05d20006
sdlc partner 4000.1020.1000 01
sdlc dlsw 1
interface serial 2
description Node Type 2.1 with SDLC station role set to negotiable or primary
encapsulation sdlc
sdlc role prim-xid-poll
sdlc vmac 1234.3174.0000
sdlc address d2
sdlc partner 1000.5aed.1f53 d2
sdlc dlsw d2
interface tokenring 0
no ip address
ring-speed 16
source-bridge 100 1 2000
source-bridge spanning
If your SDLC link is working through DLSW (it is in DLSW ring group 10 according to your first configuration statement and port list statement and must match at both ends), it should be an easy modification to add the token ring configuration to join the bridge to the remote DLSW router.
See;
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart2/bcfdlsw.htm#1003756
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can anyone explain in an easy way how this works, do people still use it, do you still need a switch to set this up or is it from pc to pc ?
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The 802.5 spec also provides a sequence for how a host enters the ring ... that cannot really be emulated in a host-to-host connection.
Again, that's it in a very brief nutshell. There is not enough space in a single post to provide a detailed description.
Token Ring is still being used in some shops, most are using "Big Iron" (IBM Mainframes). Token Ring is very dependable and provides a self-healing physical architecture.
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Last edited by nicnikf (2008-01-18 19:57:08)

nicnikf wrote:
i have a pcmcia token ring ibm card. i run 2.6.23-ARCH kernel. I know that the correct module is ibmtr_cs (from a previous distribution). When i trie to modprobe ibmtr_cs it tells me that the module doesn't exist. Searching my system i found that in /usr/src/linux-2.6.23-ARCH/include/linux/ibmtr.h there is something like a module... Does this mean that i have to compile my own kernel? in this case how can i do it?
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