I plan to connect 12 LAN patch cords from a pair of stacked Cisco
Access LAN switches to a pair of ESXi hosts.
I have 2 options:
a) 1 port per host to each switch's port that's assigned Management
b) 1 port per host to each switch's port that's assigned vMotion
c) the remaining 10 ports per server: 5 to each switch that has various
data/prod/user access VLAN(s) assigned to the switch ports
a) all switch ports are trunked (with Management, vMotion, data/prod
VLANs permitted to all ports on both the switches): so just need any
6 ports on each host to each switch (as all ports on the switches are
I think option 2 has better flexibility.
However, which of the above 2 options are better in terms of :
a) suppose 1 switch completely fails, I would like minimal downtime
to the VMs. I think with option 2, I've seen half of the VMs in each
ESXi host will become unpingable for about 5 secs & then they
become pingable again. Any other configuration to even not to
have this 5 secs downtime?
b) I think with Option 1, there could be an STP reconfiguration (can't
recall the right term to use for this Spanning Tree Protocol
that needs to recalculate itself) timing which could be 30secs?
c) which is a best practice among the 2 options & why
d) there's been a bug of ESXi 5.1 that caused crippling Unicast traffic
flooding, so which of the 2 options can isolate/contain such issue better?