| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
My customer is about to implement an extended LAN based on CISCO AGS+
and DECbridge 620s.
The network will consist of an AGS+ FDDI network and a DECbridge 620
FDDI network. The 2 FDDI networks will be interconnected via a common
Ethernet segment. The reason for this approach as opposed to a common
FDDI ring is the AGS+ does not support translation bridging at present.
It is planned to use 802.1d STP protocol to form a single spanning tree
across the two networks.
Has anyone been in this situation before? Are there any known compatibilty
issues between CISCOs and Digitals 802.1d implemenations? Are there
any other general compatibility issues (aside from the fact that CISCO
AGS+ do not support translation bridging and offer extemely poor
bridging performance- see previous entries in this conference)?
In particular when CISCO refer to forward delay in their documentation
- do they really mean the 802.1d forward delay or are they referring to
the Digital forwarding delay (2 X 802.1d forward delay)?
Thanks
Gary
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 736.1 | LEVERS::ANIL | Anil Rijsinghani | Tue Oct 06 1992 16:27 | 9 | |
I don't believe there are any outstanding interoperability problems
in 802.1d STP between DEC and Cisco bridging on Ethernet ports.
My guess would be that their forward-delay is defined the same as ours
in LB100 spanning tree (one way to tell is by looking at whether
the default is 15 or 30). Note that the Bridge MIB defines forward-delay
as in 802.1d; this applies to all SNMP implementations including ours.
agr
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