As a network administrator, you see a very high number of receive discards in the...

As a network administrator, you see a very high number of receive discards in the interface statistics of an ISL within your VCS fabric. After further investigation, the discards are found to be incrementing due to tail drops.

(Truncated example of the interface stats)

Receive Statistics:

1632132 packets, 220809631 bytes

Unicasts: 1632131, Multicasts: 0, Broadcasts: 1

64-byte pkts: 985885, Over 64-byte pkts: 415575, Over 127-byte pkts: 88870

Over 255-byte pkts: 86119, Over 511-byte pkts: 17667, Over 1023-byte pkts: 38016

Over 1518-byte pkts(Jumbo): 0

Runts: 0, Jabbers: 0, CRC: 0, Overruns: 0

Errors: 0, Discards: 912313

Referring to the exhibit, what would be the cause of the discards?