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A virtual service can be removed completely from both redundant Cisco Nexus 1100 Series appliances, or from
only one. If one of the redundant pair of virtual services becomes unusable, it can be removed from the Cisco
Nexus 1100 Series platform on which it resides. This approach facilitates recovery by preserving the remaining
virtual service in the pair. Use of this service may be needed if a new instance of the service must be provisioned.
Network Connectivity
The Cisco Nexus 1110-S has six 1 Gigabit Ethernet interfaces available for network connectivity: two 1 Gigabit
Ethernet LOM interfaces and four 1 Gigabit Ethernet interfaces, available through a PCI card (Figure 4). In additon,
the Cisco Nexus 1110-X has two 10 Gigabit Ethernet interfaces that will be enabled in a later software release.
These interfaces are not shown in Figure 4.
Figure 4.
Connections on Cisco Nexus 1100 Series VSAs
Four types of traffic flow through these interfaces: management, control, packet, and VSB data traffic. The Cisco
Nexus 1100 Series is not in the data path of everyday virtual machine data traffic. However, when Cisco NAM or
VSG VSBs are deployed, data traffic from selected virtual machines will flow to the Cisco Nexus 1100 Series to be
processed by the respective network service. The decision to use or not use these other VSBs influences the
choice of network connectivity option used for connecting the Cisco Nexus 1100 Series to the network.
Management VLAN
The management VLAN is used for management of the Cisco Nexus 1100 Series VSA. When one of the four static
uplink options is used, the Cisco Nexus 1100 Series and its hosted VSBs share the same management VLAN. In a
static topology, the management VLAN on a VSB cannot be changed directly. Since the management VLAN is
inherited from the Cisco Nexus 1100 Series VSA, if you change the management VLAN for the Cisco Nexus 1100
Series, then the change is applied to both the Cisco Nexus 1100 Series VSA and all its hosted VSBs at the next
reload.
However, this constraint does not exist in flexible topology, and the management VLAN of a VSB can be different
from the Cisco Nexus 1100 Series host.
Control VLAN
The control VLAN is a Layer 2 interface used for communication between the redundant Cisco Nexus 1100 Series
appliances. This interface handles low-level control packets such as heartbeats as well as any configuration data
that needs to be exchanged between the Cisco Nexus 1100 Series appliances.
