hello everybody
I want to active the interfaces on the 2950 but i face to these errors:
conf t
Switch(config)#int ra
Switch(config)#int range fa
Switch(config)#int range fastEthernet 0/1 - 24
Switch(config-if-range)#no shut
Switch(config-if-range)#
00:29:28: Fa0/1 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/2 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/3 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/4 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/5 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/6 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/7 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/8 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/9 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/10 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/11 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/12 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/13 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/14 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/15 can't be brought up because it failed POST in loopback test
00:29:28: Fa0/16 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/17 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/18 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/19 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/20 can't be brought up because it failed POST i n loopback test
00:29:29: Fa0/21 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/22 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/23 can't be brought up because it failed POST in loopback test
00:29:29: Fa0/24 can't be brought up because it failed POST in loopback test
Switch(config-if-range)#
could you tell me why these errors appear, so when i want to set ip in loop back interface ,this error appears:
Switch(config)#int lo
Switch(config)#int loopback ?
<0-2147483647> Loopback interface number
Switch(config)#int loopback 21
^
% Invalid input detected at '^' marker.
help me pls
