[Linux-PowerEdge] BMC and NIC #1 interaction
r.laban+lists at ism.nl
Wed Aug 5 08:14:16 CDT 2015
Today I ran into a nice challenge. I wanted to do a "ip link set em2
down", but made a slight typo and did a "ip link set em1 down" instead.
Unfortunately, at this point em1 was the only interface with an IP
configured and thus lost my SSH connection. Luckily I had finally
managed to get SOL console redirection operational. However, when I
tried to open SOL connection all I got was timeouts. It seemed that the
BMC had dropped off the network as well. Once I got a colleague to bring
up em1 again, the BMC also started working again.
Is this expected behavior??
The hardware in question is a R210-II and both BMC and em1 where
configured to use DHCP within an untagged VLAN.
It also isn't the first time I ran into more or less similar issues with
BMC/(i)DRAC connectivity using shared ports:
* With ESXi 3.5 the default driver would kill the connectivity of the
(i)DRAC when using a shared port. A newer driver became available which
solved this issue. This was on a handful of PE2950s.
* On a set of PE860s I could not have the BMC use a tagged VLAN if that
VLAN was also configured on eth0/em1 it shared the port with.
Most of these cases can be worked around by using a dedicated port
instead of shared port. But that obviously only applies to (i)DRACs and
not the good ol' BMC. And for a simple R210-II an iDRAC Enterprise is
rather silly as it's more expensive than the server itself basically.
And iDRAC Express is so limited that it's hard to warrant its costs as well.
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