Fabric Interconnect Modes and Vlan config

Configureing to LAN :-
Basic Concept if one blade in cisco ucs need to communicate with other blade in same chasis or a diffrent chassis communication does not happen through fabric extenders internal ,commincation is passed thorugh FEX which query fabric interconnect for sending the information from one blade to another.

Fabric interconnect operate in two modes :

1)Ethernet End Host Mode (default) network sees this as host with bunch of MAC addresses of blades and VM's,no spanning tree

2)Ethernet Switching Mode you have to be carefull about spanning tree and other network issues.

Ethernet End host mode :-
FI only learn MAC address from the servers and VM's in Chasis they donot learn MAC addresses from outside network,server MAC addresses can move between uplinks and FI during failover.

Ethernet Switching Mode :-
stp is introduced and uplinks will be blocked not recommaneded.Port channels should be use LACP.

PIN Groups :
UCS by default will round robin the servers to all the uplinks.But if you want a specify a port and PIN it to a server you can use pin groups.
Example :DMZ ports