| 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 |
A customer is nearing the 8000 address limit of their DECswitch 900EFs.
Basically it seems that the counter of active addresses is hovering
around the 7900 mark etc. They do have some LANS at 80-90% utilization
off of some of the ports. (silly, eh?)
In general:
Can the aging timing/parameters be mucked with at all in the switch?
Any guidelines on the wisdom of doing so?
Can the address space be increased?
Any likely solutions around this? (i.e. divide or sub-divide the LANS
more to decrease address use on the aggregate switch ports..)
Any thoughts are welcome.
Regards,
j
^--whose customer makes things that melt chips
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3555.1 | Melts chips? Hmmmm Motha Nature can do that 2... ZAP! :-) | NETCAD::BATTERSBY | Don't use time/words carelessly | Fri May 24 1996 13:23 | 18 |
There are two different spanning tree parameters that Bridges use to
govern the aging out of inactive forwarding database address entries.
These are, the Normal Aging Time, and the Short Aging Time. The Normal
Aging Time parameter controls address aging during normal network operation,
and the Short Aging Time parameter controls address aging after a topology
change. Defaults are 120 secs, and 30 secs, respectively.
Both parameter values can be set using MultiChassis Manager and their
values may affect network performance. Lower values may cause bridges
to delete inactive addresses more frequently, increasing network traffic
because fewer packets may be filtered if the node are truely active.
Higher values will cause bridges to remove inactive addresses less
frequently. If there are more active nodes than the size of the database,
then the forwarding database will reach its maximum and other (more active)
nodes may not be included in the current active list.
The address space cannot be increased. Subdividing the LANs would help too.
Bob
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| 3555.2 | sell sell and sell some more | BSS::RIGGEN | Mon Jun 17 1996 18:24 | 5 | |
Why can't the customer spend a few extra dollars and buy another 900EF
switch. getting that count down to 4000 mac addresses per ethernet
port.
Jeff
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