Thursday Sep 27, 2007

Configuring vSwitch following a S10U4 (08/07) upgrade

With the release of Solaris 10 8/07 (aka S10U4), support was added to Solaris and the LDoms vSwitch for improved packet processing. The LDoms vSwitch can now program the MAC addresses of each vNet into the physical adapter, instead of configuring the shared physical adapter in promiscuous mode. An bug was introduced when adding this support to the LDoms vSwitch driver. When plumbed as a network device, the new vSwitch fails to program its own MAC address into the adapter, and hence cannot receive any packets destined for it from the external network.

In order to enable networking between the domains and the service domain, the LDoms 1.0 Admin guide (pg 42) recommends users to unplumb the physical adapter; and plumb the vSwitch instead. In order for this to function correctly, the LDoms vSwitch will need to be assigned the same MAC address as that of the physical adapter. This workaround is only necessary when the vSwitch is plumbed as a network device, and enable it to receive packets from the external network. A patch to address this issue is in the works and will be released soon.

The issue is also documented in the LDoms 1.0.1 release notes.

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Narayan Venkat

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