| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
About The different DECHUB 900 switches. How do they switch. 1. When they take in a packet from the ethernet, do they hold the packet to check the crc before they put it out on the FDDI. ? 2. Do they only look at the first porsion af the packet, and then start to forward ? 3 Can switches be put in to a kind of "repeater mode " ? ( Cross posted in FDDI ) Jan.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2806.1 | 900's series switch support the "store-and-forward" algorithm | ULYSSE::YLOUPC::LOUIS | Thu Sep 28 1995 09:44 | 24 | |
>> About The different DECHUB 900 switches. How do they switch.
>>
>> 1. When they take in a packet from the ethernet, do they hold the packet
>> to check the crc before they put it out on the FDDI. ?
Yes - they use the store-and-forward algorithm. This means that the switch waits
to receive an entire packet, check the packet quality (runt, CRC, misaligned)
and if no error only forward it to the adequate LAN.
This algorythm garantees the integrity of the packet.
2. Do they only look at the first porsion af the packet, and then start
to forward ?
NO - But the Gigawitch/F supports this Cut-through algorithm and can be disable for
specific ports to allow store-and-forward feature.
The packet is transmitted as soon as it reads the destination address.
3 Can switches be put in to a kind of "repeater mode " ?
I don't think so.
I believe the Ethernet switching module (ESM) of Decswitch400 supports
this feature.
yves
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| 2806.2 | Thanks ! | COPCLU::PALMANN | Jan Palmann C/S Comms. Copenhagen | Thu Sep 28 1995 11:54 | 1 |