Line protocol on Interface FastEthernet0, changed state to down and up

[MuncH]

Cisco c1710 Routers (Please find the attachment of the simple topology)
No routing protocols are configured yet.

R1#show ip interface brief
Ethernet0 10.0.0.1 YES NVRAM up up
FastEthernet0 192.168.1.100 YES NVRAM up up

R2#show ip interface brief
Ethernet0 10.0.0.2 YES NVRAM up up
FastEthernet0 192.168.2.100 YES NVRAM up up

Note: Tried by changing the interfaces connected to neighbor router/switch from Ethernet0 to FastEthernet0 vice versa.

Issue:
R1#
*Mar 1 00:02:21.555: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to down
*Mar 1 00:02:26.435: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
*Mar 1 00:02:31.555: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to down
*Mar 1 00:02:33.791: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up

R2#
*Mar 1 00:03:55.239: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
*Mar 1 00:04:01.435: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to down
*Mar 1 00:04:02.675: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
*Mar 1 00:04:11.435: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to down
*Mar 1 00:04:13.295: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up

[MHM Cisco World]

Config speed and duplex 

[MuncH]

Hi @MHM Cisco World,
Thanks for the quick response.
Speed is not set, and both routers are running on Full duplex.

[MHM Cisco World]

Hardcode speed and check 

[MuncH]

Hi @MHM Cisco World 
The c1710 router port fastEthernet 0, I can configure the speed but there is no option for duplex configuration.
On the other side (i86bi_Linux-L2-Adventerprisek9-ms.SSA.high_iron_20190423) Switch port ethernet 0, I can configure the duplex but there is no option for speed configuration.

please suugest further.

[MHM Cisco World]

%LINK-5-UPDOWN Vs %LINEPROTO-5-UPDOWN
first is L1 and second is L2 issue 
but the it fastether I see this issue only in serial
can I see 
show interface fastether in both router ?

[Kanan Huseynli]

Hi,

better to use L3 IOU image (although it is not official cisco image) for router rather than something on dynamips.

[Georg Pauwen]

Hello,

what kind of cables are you using ? The router-to-router requires a crossover cable, the router-to-switch requires a straight cable. Check if your interfaces support the 'auto-mdix' command.

[MuncH · Accepted solution]

Hello @MHM Cisco World @Kanan Huseynli @Georg Pauwen 
Thank you for the response.
Issue got resolved after changing the Router model from c1710 to Cisco 3725.
I found there was a duplex mismatch with my switch port.

[MHM Cisco World]

As I first guess' duplex/speed mismatch.

Great job friend 

Thanks for update  us

Have a nice day