| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 3518.1 | Any answers? | CHEFS::PADDICK | Michael Paddick - BRS Bristol, UK | Mon May 13 1996 09:38 | 3 |
| Doesn't anyone have any comments on .0 ??
|
| 3518.2 | | NPSS::WADE | Network Systems Support | Mon May 13 1996 10:11 | 7 |
|
I'll take some time in the lab this morning and post my results.
Bill Wade
Network Product Support
|
| 3518.3 | | NPSS::WADE | Network Systems Support | Tue May 14 1996 15:55 | 25 |
|
I worked on this in the lab and was unable to reproduce the problem.
FDDI
----------------------- backup
| |
DEFBA(A) (B)DEFBA --------HUBwatch PC
| | 3
|7 7|
-----------------------
|
root
Disabling port 7 on B caused no problems and the PC stayed with port 3.
I tried with both LB100 and IEEE 802.1d spanning tree mode via the
root.
Is your DEFBA in Spanning Tree auto-select mode?
What version of code is running on the DEFBA?
Bill Wade
Network Product Support
|
| 3518.4 | Channel 3 internal or external? | CHEFS::PADDICK | Michael Paddick - BRS Bristol, UK | Thu May 16 1996 11:38 | 14 |
| Bill,
How was your PC connected to port 3?
Was it via a crossed UTP cable direct into the port, or was it via some
form of repeater card across the thin-wire channel (3)?
I can't get access to our network todey, but I will try to repeat the
exercise. I did try repeatedly on the day it was happening.
Regards,
Meic.
|
| 3518.5 | Answer to .3 questions | CHEFS::PADDICK | Michael Paddick - BRS Bristol, UK | Thu May 16 1996 11:50 | 12 |
| Bill,
To anser questions in .3 that I forgot:-
The DEFBA is running "HW=v1/2,RO=v0.4,SW=v1.5.2"
It's running LB100 mode, and is not autoselect.
(We have LB100's in our LAN).
Regards,
Meic.
|
| 3518.6 | DECswitch900EF doe not default to the thinwire.... | NETCAD::BATTERSBY | Don't use time/words carelessly | Thu May 16 1996 11:54 | 9 |
| There is a veiled reference made in .0 to the use of the
hub backplane thinwire channel. Please keep in mind when
using the DECswitch900EF, that there is no port that defaults
to the backplane thinwire channel nor is there any default
connection made to the thinwire channel. Port 3 can be re-directed
to the thinwire channel as an *option* from HUBwatch, but there
is *no* default connection made to the thinwire channel.
Bob
|
| 3518.7 | | NPSS::WADE | Network Systems Support | Thu May 16 1996 12:06 | 13 |
| Mike,
The DEFBA is locked down to IEEE 802.1d spanning tree mode by default.
If you have LB100s in your net you need to set the DEFBAs to
auto-select so they will revert to LB100 spanning tree mode.
Looks like you have two spanning trees running here.
For my test I came in through the front panel port 3.
Bill
|
| 3518.8 | | CHEFS::PADDICK | Michael Paddick - BRS Bristol, UK | Thu May 16 1996 13:25 | 22 |
| Re: .6 I know that port 3 doesn't 'default' to the thinwire, and
I wasn't hinting at that in .0.
We have the DECserver-90TL on the backplane 'thin-wire' channel, and
therefore have to have port 3 of the DEFBA on that channel, as port 3
is the only one that can connect to the 'thin-wire'.
Re: .7 As I stated, the DEFBA is set up for LB100 mode, because I know
for a fact that there are LB100's in the LAN. Therefore, we only have a
LB100 STP domain across all our bridges. I know it's set up for LB100,
because I set it that way (not autoselect) with HUBwatch.
Bill,
Is there any chance you could repeat the exercise with port 3
facing in to the backplane, maybe via a repeater to the PC, or perhaps
you have a DECserver you could put in there and try to ping it etc.
like I have here.
This may be the significant difference.
I will try to repeat your configuration and see if it still happens
here. My guess is that it wont.
Meic.
|
| 3518.9 | Autoselect is only way DEFBA's will see LB100's... | NETCAD::BATTERSBY | Don't use time/words carelessly | Thu May 16 1996 13:44 | 9 |
| >> because I set it that way (not autoselect) with HUBwatch.
Ok let's get our terminology correct....
Uhmmm what Bill is trying to tell you is that in order for the
DEFBA's to *see* the LB100 spanning tree hellos, you must *set*
the DEFBA's to autoselect. The DEFBA's aren't going to hear the
LB100's unless you *set* them *to* autoselect mode. Got it? :-)
Bob :-)
|
| 3518.10 | Definitely LB100, and Definitely goes wrong. | CHEFS::PADDICK | Michael Paddick - BRS Bristol, UK | Fri May 17 1996 09:14 | 21 |
| OK Bob,
Sorry. I have got the DECswitch set up for Autoselect, and it has
switched itself into LB100 mode having seen a LB100 multicast inbound.
The important thing from the point of my 'problem' is that all the
bridges in our LAN are running in LB100 mode, as they now are.
I know that I need the DECswitch to be in Autoselect. I just got a bit
confused with the terminology.
I *definitely* do not have multiple STP domains. The root bridge as
perceived by the DEFBA is the same as the one seen by all other bridges
in our LAN.
Anyway; Bill,
I have repeated the experiment this morning, and it is definitely
behaving in the way I described, if the DECserver, or any other device
is on port the backplane 'thin-wire' channel via port 3.
It seems that the DECswitch's frowarding tables get confused when a
port is disabled by SNMP, as different from physically 'broken' by
unplugging the cable.
Meic.
|
| 3518.11 | | NPSS::WADE | Network Systems Support | Fri May 17 1996 09:53 | 21 |
|
I'll give it another try with the DEFBA(B) port 3 redirected to the BP
thinwire and the HUBwatch PC coming in to the thinwire through a repeater
port -
FDDI
----------------------- backup
| |
DEFBA(A) (B)DEFBA ----------------
| | 3(BP thinwire) |
|7 7| |
----------------------- |
| repeater
root |
|
|
HUBwatch PC
Bill
|
| 3518.12 | Thank ewe. | CHEFS::PADDICK | Michael Paddick - BRS Bristol, UK | Fri May 17 1996 10:02 | 6 |
| Thanks Bill,
Your diagram in .11 looks the same as I have here.
Meic.
|
| 3518.13 | | NPSS::WADE | Network Systems Support | Fri May 17 1996 18:42 | 13 |
| I was able to reproduce the MAC address moving to the disabled port.
The communication between modules on the thinwire through port 3 on
the DEFBA did not appear to be disrupted as the address moved back to
port 3. It looks like the address moves to the disabled port if the
source is quiet. Strange.
I advise you to open an IPMT against the DEFBA so we can track the problem.
Bill Wade
Network Product Support
|
| 3518.14 | IPMT on its way. | COMICS::BUTT | Give me the facts real straight. | Mon May 20 1996 05:14 | 6 |
| Bill
Mike has filed an IPMT for this problem. You should see it soon !
Rgds Richard.
|