| Title: | DECbrouter-90T2,-T2A,-T1 |
| Notice: | Kits, DOCs, Release notes, SPDs notes 1-10 |
| Moderator: | FOUNDR::SHEEHAN |
| Created: | Wed Dec 23 1992 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1313 |
| Total number of notes: | 4889 |
A customer has asked me a question I'm struggling to provide a
definitive answer to as I have no immediate access to manuals or kit
and insufficient knowledge about the device. I hope someone can
help....
If I configure a DECbrouter 90T1 into a Hub900, what happens re: the
Ethernet port connection ?
a) does it default to the internal hub backplane Thinwire ?
b) can I reset it to use the front panel UTP port using Hubwatch/MCM ?
c) will/does it autosense which Ethernet port to connect to ?
d) will/can it failover between UTP/backplane ports ?
I have a nagging doubt that the front panel UTP port can be used when
in a hub900 slot as the ThinWire takes/keeps the connection. However, I
spoke with someone in CSC who thinks it may be possible to override
this using the telnet CLI SET Interface (?) facilities....
As background the customer want to provide resilience in his network
configuration. The basic idea is to have 2 hub900 chassis each with 3
DECbrouters and a DECswitch 900EF installed. The 900EFs will connect on
a common FDDI ring. The Brouters will (preferably) use their front UTP
Ethernet ports to connect to the alternate hub's 900EF Ethernet ports
in a 1-1 relationship. ie. oodles of bandwidth, port resilience etc.
The thoughts are that should a 900EF module fail, the Brouters can
"failover" from the front UTP to the rear ThinWire Ethernet ports (in
hub) and continue working....... albeit with "reduced bandwidth". The
fact that the WAN port on each Brouter is only able to run at "Mbps max
seems to have escaped them - and I believe they're running sub-2Mbps
links anyway !
I have serious doubts if this failover would happen "automagically"
anyway apart from the actual availability of the front Ethernet ports
to be used for the cross-links. At best even if the UTP's are usable I
see that the failover might have to be managed manually.
Can someone prove/disprove the above ?
Rog
harveyr@mail.dec.com
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1311.1 | answers | CHEFS::HARVEY | Baldly going into the unknown... | Mon Jun 02 1997 16:37 | 15 |
I received this via email and thought it useful to post to close down
the .0 query......
>> Funny you should ask! Actually we tested this the other day and
>> it appears if you have an Ethernet connection from the UTP (10baseT)
>> port out the front of the DECbrouter it takes priority over the
>> Thinwire or when in a HUB the HUB backplane Ethernet connection.
>> So your answer is yes.
>> Regards,
>> Neil Sheehan
>> NPS/NSTG Router Support
Rog
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