MDS 9222i IPS configuration

Unanswered Question

Hi,

I'm trying to configure my 4 port IPS, and am running into some peculiar situations that I can't seem to find resolution on.

I want to dedicate 2 of the 4 ports for iSCSI and the other 2 for FCIP. I'd like to bond 2 ports to support one IP addr, but am having a hard time doing that as well. When I try to add a GE port to a channel, it gives me a port not compatible message. Could it possible that GE IPS ports cannot be added to a port channel? The Cisco guide is rather vague, as it only gives instructions on how to do it. Any insight would be helpful.

TIA.

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Michael Brown Tue, 11/18/2008 - 07:00

Ken,

As far as I know, only the IPS-4 and IPS-8 line cards support ether-channel (bundling of ethernet ports into a single logical link). The GE ports on the 9222i each have their own IP asic and this prevents bundling them together. With the IPS-4 and IPS-8, each pair of ports share an asic. IE: GE 1 and 2, 3 and 4 and so on. So only ports 1 and 2, or 3 and 4 could be bundled. GE 1 and 3 could not since they do not share an asic.

Hope this helps,

Mike

Michael Brown Thu, 11/20/2008 - 02:51

Ken,

The IPS-4 is End of Sale, I'm not sure about the IPS-8 but it may also be End of Sale. You are correct, for FCIP redundancy, the best option is to create multiple tunnels, each using 1 GE interface, and then port-channel them together. If possible, use GE ports on different line cards so that if a line card reloads (like during an upgrade) the entire port channel will not be affected. All GE ports will flap during upgrade, they are not 'non-disruptive', but if the FCIP port channel is spread across multiple line cards, it will stay up, while the individual links flap 1 at a time during the upgrade. As for iSCSI, the best option is to use iSLB and load balance multiple incoming iSCSI connection across several GE ports. There really is no longer a need to bundle the GE ports, as the only time it was useful was for iSCSI prior to the iSLB (which is iSCSI server load balancing).

Hope this helps,

Mike

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