Which type of interface is created on the Cisco Nexus 5548 Switch to represent ports connected to
a FEX?
A.
HIF (host interface)
B.
LIF (logical interface)
C.
connected Ethernet
D.
SIF (satellite interface)
E.
VIF (virtual interface)
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According to my revision notes it’s the LIF on the parent switch, and the VIF is a logical interface on the fex?
This is from ..
http://routing-bits.com/2012/05/16/what-is-a-fabric-extender/
Lets take a deep look at the backend operations. There are various interfaces involved:
• HIF (Host Interface): Are the physical user/host interfaces on the FEX. These interfaces receive normal Ethernet traffic before it is encapsulated with the VN-Tag header. Each HIF interface is assigned a unique VN-Tag ID that is used with the encapsulation.
• NIF (Network Interface): Physical uplink interfaces on the FEX. These interfaces can only connect back to the parent switch and carries only VN-Tagged traffic.
• LIF (Logical Interface): Is the logical interface representation of the HIF and its configuration on the parent switch. Forwarding decisions are based on the LIF.
• VIF (Virtual Interface): Is a logical interface on the FEX. The parent switch assigns/pushes the config of a LIF to the VIF of an associated FEX which is mapped to a physical HIF. This is why replacing a FEX becomes trivial in that the broken FEX is unplugged and the replacement is plugged in.
The diagram below should make this a bit more clear:
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