I have one network uisng bgp for WAN and eigrp for LAN for a customer. For HQ and branch, i used routing eigrp for the LAN conection from HQ to branch and from branch to HQ.
HQ have one tunnel connection to the branch.Tunnel also using eigrp.Branch also have one tunnel to HQ.
Connection from branch to HQ and HQ to branch working good. But after 2 weeks, i found that the LAN connection to the HQ lost.When show ip route at the HQ, i can't see the LAn network segment.But at the branch network for LAN segment still in the router eigrp. Tunnel to HQ at the branch still up.But ping LAN to LAN from HQ to branch and branch to HQ failed.
My questions as below:
1)Need your advise on why is the network LAN segment of the branch missing and couldn't see from the HQ?
2)What are the course of the problem ?
3) What should i do in order to prevent the problem to happen again?