Solved: Cisco and non Cisco router WAN interfaces

Uuganbayar Gankhuyag · ‎03-19-2013

Hi Guys,

I have problem with router interface uplink problem.

Cisco and non Cisco router WAN interfaces have connected throug cable around 40-50m long.

Problem is either one of router is temp/Power ,etc.../ down link is not coming back auto. We have to reload Cisco router to get uplink.

I am sure you guys having similiar issue before.

How did you solve this ?

Do you any suggestion to kind of issue ?

anisaini · ‎03-19-2013

you need to identify the underlying cause of the wan going down and making device unreachable.

from the problem description it appears that you are using some DSL connection on wan, either pppoe or pppoa.

IF my assumption is right then you may be using one of the cisco's 800 series or ADSL/VDSL/SHDSL card on ISR routers.

So for these DSL connections you may need to upgrade the firmware as this kind of a disconnect as you have reported are more often seen due to firmware issues.

If the connection is other than DSL like FR ATM ISDN or LL then you need different approach depending on kind of connections you are using.

Reply if it helps

View solution in original post

Giuseppe Larosa · ‎03-19-2013

Hello Uuganbayar,

you have not specified what type of WAN interface and what type of encapsulation you are using ( PPP likely in a multivendor context).

Before reloading the router, you should try to restart the interface with a shut/no shut cycle

conf t

interface WAN

shut

! wait 30 seconds

no shut

This gives the interface a change to restart the neighbor state machine for the link protocol in use and it should fix the issue.

where WAN is just a placeholder for the real name of the WAN interface

Hope to help

Giuseppe

Uuganbayar Gankhuyag · ‎03-19-2013

Giuseppe,

Thank you for reply

yes i do shut/no shut command but this Cisco router is in remote location once link is down i don't have access to router. we have to reload manually with someone there/not always possible/.

Encapsulation : ARPA

I have tried IP SLA with EMM. But it reloading the router what i am not intended suppose i have done wrong /wrong input/

Giuseppe Larosa · ‎03-19-2013

Hello Uuganbayar,

I see the cisco router becomes isolated when the link fails.

>> Encapsulation : ARPA

It is an ethernet link.

If I correctly understand you are trying to implement an EEM policy that checking an IP SLA does some action on the router itself.

I would suggest to try to implement the EEM policy to perform the action of the shut/no shut cycle of the interface instead of reloading the device when the IP SLA fails.