Sampling VXLAN traffic

You can use sFlow technology to sample 128 bytes of a VXLAN packet starting from the outer IP header. When configuring sFlow technology, you must specify an interface on which VXLAN packets enter or exit.

• Ingress packets sampled before encapsulation-At this stage, sampled packets do not have an outer IP header. Outer Layer 2, Layer 3, and VXLAN network identifier (VNI) information are added to the packets as an sFlow extended header. 
• Ingress packets sampled before de-encapsulation-At this stage, sampled packets have an outer IP header. An sFlow extended header is added for an inner header offset. 
• Egress packets sampled after encapsulation-At this stage, sampled packets have an outer IP header. An sFlow extended header is added for an inner header offset. 
• Egress packets sampled after de-encapsulation-At this stage, sampled packets do not have an outer IP header. Outer Layer 2, Layer 3, and VNI information are added to the packets as an sFlow extended header.