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Webcast-Catalyst9k
New Member

Interface up/down every 2 hours

I'm using a Cisco SOHO 71 with IOS 12.2 It has two 10mb ethernet ports and serves as a NAT gateway on a Surfboard cable modem. E1 faces the modem and gets its IP via DHCP from the ISP, Charter communications.

I'm logging to a computer on the LAN (E0) side, and its picking up these strange error messages:

2003-06-10 23:03:40 %LINK-5-CHANGED: Interface Ethernet1, changed state to administratively down

2003-06-10 23:03:40 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to down

2003-06-10 23:03:43 %LINK-3-UPDOWN: Interface Ethernet1, changed state to up

2003-06-10 23:03:43 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to up

2003-06-11 01:03:41 %LINK-5-CHANGED: Interface Ethernet1, changed state to administratively down

2003-06-11 01:03:41 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to down

2003-06-11 01:03:45 %LINK-3-UPDOWN: Interface Ethernet1, changed state to up

2003-06-11 01:03:45 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to up

2003-06-11 03:03:43 %LINK-5-CHANGED: Interface Ethernet1, changed state to administratively down

2003-06-11 03:03:43 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to down

2003-06-11 03:03:46 %LINK-3-UPDOWN: Interface Ethernet1, changed state to up

2003-06-11 03:03:46 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to up

2003-06-11 05:03:45 %LINK-5-CHANGED: Interface Ethernet1, changed state to administratively down

2003-06-11 05:03:45 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to down

2003-06-11 05:03:48 %LINK-3-UPDOWN: Interface Ethernet1, changed state to up

2003-06-11 05:03:48 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to up

2003-06-11 07:03:47 %LINK-5-CHANGED: Interface Ethernet1, changed state to administratively down

2003-06-11 07:03:47 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to down

2003-06-11 07:03:50 %LINK-3-UPDOWN: Interface Ethernet1, changed state to up

2003-06-11 07:03:50 %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet1, changed state to up

Every two hours the outside interface goes down for 3 seconds, but it says ADMINISTRATIVELY DOWN. I assure you I am not doing a shutdown/no shutdown...heck I'm not even home when most the time...and that I an the only person with access to the router.

Any idea why this is happening?? Here is the E1 part of the config:

interface Ethernet1

mac-address 0001.0273.e831

ip address dhcp client-id Ethernet1 hostname myrtr

ip access-group 101 in

ip nat outside

no keepalive

no cdp enable

4 REPLIES
New Member

Re: Interface up/down every 2 hours

BUMP...lol

New Member

Re: Interface up/down every 2 hours

going by your log .. check to see is you have any device/electrical starting every two hrs that is in close proximity to your cisco device. the exact nature of the int going down every two hrs being predictable suggests that there is some external force causing it to drop .. the only thing i can think of is if you have any airconditioning units or some other powerful source of emf causing it to drop...

hint .. find out what goes on every two hrs in yur facility... and since it says admin down .. check if you have any NMS that is doing some changes in the specified time period

let us know how u solve this one....

New Member

Re: Interface up/down every 2 hours

HI

I think this problem occured from the other side maybe, set the Keepalive command in your interface and check the other side.check the snmp-community access that is it write or read access if you set snmp-server on your router.

NIX TECH.

Mohsen.

New Member

Re: Interface up/down every 2 hours

well im running a syslog service (kiwi express syslog) not smtp. I don't know much about smtp but its a whole different protocol.

I considered the possibilty that since the IP is DHCPed, that the lease is expiring and thats where the error is being created. But apparently Charters DHCP leases are for 6 hours...not 2.

I haven't ruled out an ISP problem though....I think im going to leave the router unplugged from the cable modem for a few hours and see if the interface administrative shutdown still happens.

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