I have assigned two IP addresses on the same subnet to the the E1 and E2 ports on my SLC and now I am getting strange behavior. For instance, if I disable either port both of them stop working. Why is this?

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It is strongly recommended that the IP addresses of the two ethernet ports on an SLC be on different IP subnets.

It is intended that the 2nd ethernet port be used for a separate, redundant network connection completely independent of the connection on the 1st ethernet port. A completely independent network connection will by definition be on a different IP subnet.

The underlying operating system of the SLCs does not allow two ethernet interfaces on the same network. If you do assign IP addresses on the same network to the two ethernet ports they will be treated as a single ethernet interface. In this case, if you disable either port, the subnet for that port will be removed from the routing table, effectively disabling both interfaces that share that same subnet.

Also, outgoing traffic may be sent out of either interface regardless of which source IP address is used. This can cause unusual behavior on the network.

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[Originally Published On: 02/28/2006 01:58 PM]