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тАО12-12-2006 11:50 AM
тАО12-12-2006 11:50 AM
Somebody told me he is "almost 100% sure" VMS on Alpha does NOT support the spanning tree algorithm. I find it mind-boggling! Is it true?
I'd appreciate any help. Specifically, if this is true, can I have a fully redundant LAN interconnect i.e connect the 3 WE0s to one VLAN and the 3 WE1s to another, separate VLAN and hope the cluster does not fail if one of the VLANs fail?
THanks
Ziggy
Solved! Go to Solution.
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тАО12-12-2006 12:06 PM
тАО12-12-2006 12:06 PM
Re: Multiple interfaces and Spanning Tree
the second NICs to that device -- totally separate
and should keep the cluster going if you have any
VLAN problems.
Don't configure any IP or DECnet on these, use
them only for SCS traffic.
Dave
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тАО12-12-2006 12:16 PM
тАО12-12-2006 12:16 PM
Re: Multiple interfaces and Spanning Tree
Ziggy
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тАО12-12-2006 12:44 PM
тАО12-12-2006 12:44 PM
Re: Multiple interfaces and Spanning Tree
devices also removes a single point of failure.
Dave
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тАО12-13-2006 01:13 AM
тАО12-13-2006 01:13 AM
SolutionYes. Spanning tree is part of the 802.1 standard for bridges. Naturally, a normal host doesn't support it; why should it?
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тАО12-13-2006 05:30 AM
тАО12-13-2006 05:30 AM
Re: Multiple interfaces and Spanning Tree
Maybe I should rephrase the question: Can multiple active NICs on an Alpha be connected to the same LAN for the purpose of running redundant SCS communications with other nodes in the cluster?
The IP issue is irrelevant here, since FailsafeIP can handle it.
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тАО12-13-2006 08:46 PM
тАО12-13-2006 08:46 PM
Re: Multiple interfaces and Spanning Tree
OK, the answer to that question is that you can pretty much make any arbitrary topology, as long as all the nodes share a LAN somewhere, pairwise. If you have a spare dual NIC you could even make point-to-point connections as a backup. Otherwise, connecting to separate switches and tying the switches together works well, unless something DoSses your LAN.
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тАО12-13-2006 08:51 PM
тАО12-13-2006 08:51 PM
Re: Multiple interfaces and Spanning Tree
Yes - and by default SCS use all NICs to form a redundant/shared connection between cluster nodes. All NICs with same performance (SCS rating based on speed, delay, reliability) then form a virtual circuit(s) to other node(s) in cluster.
You can see formed channels (NIC to NIC) via 'mc scacp sho chann' and virtual circuit (bundles of NICs) via 'mc scacp show vc' - depends on VMS version.
Jiri