Question of the day

вопрос:

что такое cef epoch?
пример sh ip cef:

Router#sh ip cef detail
IPv4 CEF is enabled and running
VRF Default:
 79 prefixes (79/0 fwd/non-fwd)
 Table id 0
 Database epoch:        0 (79 entries at this epoch)

0.0.0.0/0, epoch 0, flags default route handler
  no route
0.0.0.0/8, epoch 0
  Special source: drop
  drop
0.0.0.0/32, epoch 0, flags receive
  Special source: receive
  receive
10.0.1.0/24, epoch 0
  recursive via 192.168.1.2
    attached to FastEthernet0/0.304
10.0.2.0/24, epoch 0
  recursive via 192.168.2.2
    attached to FastEthernet0/0.305
10.0.3.0/24, epoch 0
  recursive via 192.168.3.2
    attached to FastEthernet0/0.306
10.0.4.0/24, epoch 0
  recursive via 192.168.4.2
    attached to FastEthernet0/0.307
127.0.0.0/8, epoch 0
  Special source: drop
  drop    

ответ:

это глобальная версия таблицы FIB, т.е. у всех up-to-date записей версия должна быть равной. служит для синхронизации FIB.