From: Peter Simmons (psimmons@xxxxxxxxxxxxxx)
Date: Mon Jun 11 2001 - 01:29:43 GMT-3
Jim,
Well if it's your NIC/Drivers, a "simple" test is the following: ;-)
On one of your routers, configure an access-list 1100 with the source-mac
of on PC NIC card that is attached to that ring, and use "debug list 1100"
and "debug token ring" to look at the frames being generated by the station
during a query.
In this example, the source mac address is 0020.35c1.01c4, so the access
list 1100 is:
access-list 1100 permit 0020.35c1.01c4 8fff.ffff.ffff 0000.0000.0000
ffff.ffff.ffff
(The first byte of the source mask is to allow any frames with a RII bit set
to match as well)
Then apply the debugs:
R4#deb list 1100
R4#deb token ring
Token Ring Interface debugging is on
for access list: 1100
R4#
To0: br: LLC: F0F0032C 00FFEF0A 17110000 00110053 41555341 47452020 ln: 63
TR0: br: riflen 2, rd_offset 0, llc_offset 16
To0: in: MAC: acfc: 0x1040 Dst: ffff.ffff.ffff Src: 8020.35c1.01c4 bf:
0xC3 0x30552DE
To0: in: RIF: 8270
To0: br: LLC: F0F0032C 00FFEF0A 17110000 00110053 41555341 47452020 ln: 63
TR0: br: riflen 2, rd_offset 0, llc_offset 16
To0: in: MAC: acfc: 0x1040 Dst: ffff.ffff.ffff Src: 8020.35c1.01c4 bf:
0xC3 0x30552DE
To0: in: RIF: 8270
[Some stuff SNIPped for brevity]
As you can see, the first frame has a source MAC of 8020.35c1.01c4 ,
indicating a RIF, and is using DSAP/SSAP of F0F0, i.e.NetBIOS. Depending on
your NIC drivers/protocol stack, you may also see frames destined for the
C000.0000.0080 functional address (again NetBIOS), but these would be SNAP
frames (DSAP/SSAP AAAA). As always, YMMV depending on the make of TR
chipset/drivers/phase of the moon etc.
Using this method wil tell you if you're generating RIFs or not. This would
then lead you on to either a Driver/NIC issue, or a config change on the PC.
Another test would be "debug dlsw reach" on that peer, this would indicate
if the NetBIOS name queries were making it through to the DLSw process or
not.
Again, hope this is some use.
Regards
Pete S.
(Three Days 'til Brussels..... )
-----Original Message-----
From: Jim Mathers <jmathers@inflow.com>
To: 'Peter Simmons ' <psimmons@netcomuk.co.uk>; 'ccielab@groupstudy.com '
<ccielab@groupstudy.com>
Date: 17 June 2001 21:50
Subject: RE: question about NETBIOS, RIF fields, and DLSw+
>Yes--"source-bridge spanning" was on both interfaces. Thanks.
>
>-----Original Message-----
>From: Peter Simmons
>To: Jim Mathers; ccielab@groupstudy.com
>Sent: 6/10/01 12:26 PM
>Subject: Re: question about NETBIOS, RIF fields, and DLSw+
>
>Jim,
>
>Have you got the "source-bridge spanning" command on the TR interfaces?
>
>By default, NetBIOS uses spanning explorers, and SNA uses All-routes
>explorers. If you don't use the IBM spanning tree protocol to build a
>spanning tree path for STE explorers, then the interface drops them, as
>it
>regards itself to be in "blocking" mode for these frames. Using the
>"source-bridge spanning" command puts the interface automatically into
>"forwarding" mode for the NetBIOS STE frames, and allows them to be
>forwarded onto the DLSw process (or wherever else).
>
>This is an SRB thing, as you've seen TB just forwards the frames as you
>expect.
>
>Try a "debug DLSw reach" before and after applying the command and see
>the
>difference.....
>
>Lots more info on this on CCO, search on "source-bridge spanning" as a
>starter.
>
>Hope this helps,
>
>Regards
>
>Pete S.
>
>(Four days 'til Brussels.......)
>
>
>-----Original Message-----
>From: Jim Mathers <jmathers@inflow.com>
>To: Jim Mathers <jmathers@inflow.com>; 'ccielab@groupstudy.com'
><ccielab@groupstudy.com>
>Date: 17 June 2001 17:21
>Subject: RE: question about NETBIOS, RIF fields, and DLSw+
>
>
>>Further, I just changed the Token Ring interfaces from SRB to
>Transparent
>>bridging by removing the statement "source-bridge 20 1 100" and adding
>the
>>statement "bridge-group 20" on both of the routers and it works fine. I
>also
>>had to remove the "source-bridge ring-group 100" from the DLSw+ configs
>and
>>add a "dlsw bridge-group 20". Now everything is working fine. I am
>forced
>to
>>assume that WIN98 is NOT generating a RIF, but instead is sending a
>NETBIOS
>>name-query. I am still looking for feedback on this. Any help would be
>>appreciated. Also, all Cisco documentation that I have read says that
>you
>>have to do SRB for Token Ring. I guess that I am misunderstanding
>something
>>because I am successfully doing transparent bridging between two remote
>>Token-Rings. Any feedback? Please comment. Jim
>>
>>-----Original Message-----
>>From: Jim Mathers
>>Sent: Sunday, June 17, 2001 10:35 AM
>>To: 'ccielab@groupstudy.com'
>>Subject: question about NETBIOS, RIF fields, and DLSw+
>>
>>
>>Hello,
>>
>>I have two hosts connected to two different MAUs that in turn connect
>to
>two
>>different routers via Token-Ring interfaces in my lab. The two routers
>are
>>separated via an IP backbone. I have configured DLSw+ to bridge between
>the
>>two Token Rings. The hosts are running WIN98 with only NETBEUI
>configured.
>>When I click on Network Neighborhood, the hosts do not find each other.
>Nor
>>does DLSw build a circuit from end to end. I get my DLSw+ Peers to
>connect
>>fine. I have been troubleshooting this all night and after getting very
>>frustrated, I pulled up the DLSw+ troubleshooting document on Cisco's
>web
>>site. It says that it is possible that the Operating System (WIN 98) on
>my
>>hosts will not generate a RIF, and, if this is the case, DLSw+ will
>fail
>>because the router will look for a RIF on the incoming frames. If the
>frames
>>do not contain RIFs, then the router will not be able to source-route
>bridge
>>the packet onto the virtual ring. Has anyone seen this? I want to put
>this
>>behind me. I just finally joined the list and thought it would be a
>good
>>idea to bounce this of off the crowd. My lab is scheduled for September
>23rd
>>in San Jose. Thanks in advance.
>>
>>Jim Mathers
>>**Please read:http://www.groupstudy.com/list/posting.html
>>**Please read:http://www.groupstudy.com/list/posting.html
>**Please read:http://www.groupstudy.com/list/posting.html
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