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October 21st, 2005 14:00
3324 Redundancy Collision Issue
We are having collision issues within our server rack configuration and are trying to resolve them.
Here is our configuration:
2 PowerConnect 3324s
2 PowerEdge 2850s
10 4-port hubs
1 Firewall
The hubs are connected to VLinx RS-232/TCP/IP converters, which are in turn connected to modems receiving data. Each hub is connected to both switches. Each server is connected to both switches. The NIC cards of the servers are bridged.
The main thing in this config is redundancy, meaning that if one switch fails, both servers still receive data from the 10 hubs. However, cross-connecting the servers results in the collisions.
If only one network cable from one of the servers is unplugged from one of the switches, the collisions stop occurring.
I need ideas on how to resolve this issue!
Thank you!
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DELL-Cuong N.
1K Posts
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October 26th, 2005 19:00
Not sure why you bridge the NICs. To do redundancy at the NIC you should probably use NIC teaming (read your NIC documentation for more info - some NIC require advance driver to do NIC teaming). Anyway, if you created physical loops in your network then you need to enable STP (spanning tree protocol) which will automatically disable one of the redundant paths to prevent bridging loop from occuring in the network. If a path fails then STP will run and re-establish a previously disable path. Note that STP takes about 30 seconds to converge/update the spanning tree so if it is on the failover may still take up to 30 seconds. Other option is RSTP (rapid spanning tree protocol) and enabling fastlink mode on the access ports with STP running which should make the convergence faster.
Cuong.