Home » Cisco » 350-080 » Which statements are true about the subswitch ID that is filled in the header?
Refer to the exhibit.
Which statements are true about the subswitch ID that is filled in the header? (Choose three.)
A. FabricPath switches running vPC use this field to identify the specific virtual switch.
B. FabricPath switches running vPC+ use this field to identify the specific vPC+ PortChannel on which traffic is to be forwarded.
C. The subswitch ID field is locally significant to each vPC+ switch pair.
D. The subswitch ID field must be unique within the FabricPath domain.
E. In the absence of vPC+, this field is set to 0.
Correct Answer: BCE
Explanation/Reference:
Explanation:
In releases prior to NX-OS 6.1(2), the sub-switch ID (sSID) field identifies the source or destination VPC+ port-channel interface associated with a particular VPC+ switch pair. FabricPath switches running VPC+ use this field to identify the specific VPC+ port-channel on which traffic is to be forwarded. The sSID value is locally significant to each VPC+ switch pair. Note that, because this field is 8 bits, using the sSID to identify VPC+ portchannels imposes a limit of roughly 250 VPC+ port-channels per VPC+ switch pair (244 to be precise).
Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-687554.html