Management IP Pool

Themanagement IP pool is a collection of external IP addresses. Cisco UCS Manager reserves each block of
IPaddresses in the management IP pool for external access that terminates in the CIMC on a server.
Youcan configure service profiles and service profile templates to use IP addresses from the management IP
pool.You cannot configure servers to use the management IP pool.
AllIP addresses in the management IP pool must be in the same subnet as the IP address of thefabric
interconnect.
Themanagement IP pool must not contain any IP addresses that have been assigned as static IP addresses
fora serveror serviceprofile.
Note
Traffic Management

Oversubscription

Oversubscriptionoccurs when multiplenetwork devices areconnected to the samefabric interconnect port.
Thispractice optimizes fabric interconnect use, since ports rarely run at maximum speed for any length of
time.As a result, when configured correctly, oversubscription allows you to take advantage of unused
bandwidth.However, incorrectly configured oversubscription can result in contention for bandwidth and a
lowerquality of service to allservices that use the oversubscribed port.
Forexample, oversubscription can occur if four servers share a single uplink port, and all four servers attempt
tosend data at a cumulative rate higher than available bandwidth of uplink port.

Oversubscription Considerations

Thefollowing elementscan impact how youconfigure oversubscription in aCisco UCSdomain:
Ratio of Server-Facing Ports to Uplink Ports
Youneed to know what how many server-facing ports and uplink ports are in the system, because that ratio
canimpact performance. For example, if your system has twenty ports that can communicate down to the
serversand only two ports that can communicate up to the network, your uplink ports will be oversubscribed.
Inthis situation, the amount of traffic created by the servers can also affect performance.
Number of Uplink Ports from Fabric Interconnect to Network
Youcan choose to add more uplink ports between the Cisco UCS fabric interconnect and the upper layers of
theLAN to increase bandwidth. In Cisco UCS, you must have at least one uplink port per fabric interconnect
toensure that all servers and NICs to have access to the LAN. The number of LAN uplinks should be determined
bythe aggregate bandwidth needed by all Cisco UCS servers.
Forthe 6100 series fabric interconnects, Fibre Channel uplink ports are available on the expansion slots only.
Youmust add more expansion slots to increase number of available Fibre Channel uplinks. Ethernet uplink
portscan exist on the fixed slot and on expansion slots.
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Traffic Management