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I can't ping or telnet router with its loopback IP ( CEF problem)

hello all ,

I have here a strange problem , loopback IP configured on the router for Mgmt . and I can't ping or telnet this IP

when checking CEF I can see

router # sh ip cef 10.1.1.1

IP-address, version 202, epoch 0, attached, connected

0 packets, 0 bytes

via Loopback1111, 0 dependencies

valid discard adjacency <<<<<

router #sh ip cef loopback 1111

Prefix Next Hop Interface

10.1.1.1 attached Loopback1111

while after clearing CEF , problem fixed

router # sh ip cef 10.1.1.1

10.1.1.1 , version 15, epoch 0, connected, receive

router #sh ip cef loopback 1111

Prefix Next Hop Interface

10.1.1.1 receive

IOS ver is : c2800nm-adventerprisek9-mz.124-8

Do you have any idea

Thanks

Moamen

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