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Why fdb aging timer shows “0”?

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TitleWhy fdb aging timer shows “0”?
Question
Why fdb aging timer shows “0” on X480 and X460-G2, 100G4X, 100G4X-xl, and BD8900 xl-series cards?

SW03.3 # show fdb
Mac                     Vlan       Age  Flags           Port / Virtual Port List
--------------------------------------------------------------------------------
00:02:2f:bd:ae:95     V0162W(0162) 0000  dhm            29
00:02:81:c0:85:c5     V0172W(0172) 0000  dhm            27
00:02:81:c0:85:c5     V0182W(0182) 0000  dhm            21
00:02:df:c1:67:9d     V0162W(0162) 0000  dhm            29
00:02:f7:0e:ad:9e     V0101W(0101) 0000  dhm            27
00:03:7f:05:c0:06     V0101W(0101) 0000  dhm            27
00:03:7f:05:c0:06     V0162W(0162) 0000  dhm            29
00:03:ab:3e:8b:80     V0101W(0101) 0000  dhm            27
00:03:ab:63:e8:66     V0161W(0161) 0000  dhm            29
Environment
  • X480
  • X460-G2
  • BD8K with 100G4X, 100G4X-xl and BD8900 xl-series cards
Answer
Hardware Aging Platforms (Only Summit X480 and X460-G2, 100G4X, 100G4X-xl and BD8900 xl-series cards)

Aging is controlled entirely by the hardware based on the traffic hit that happens for the individual FDB
entry. The age from show fdb output is alway shown as 0. The entry will be removed when it ages
out.
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