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Tunnel Interface Questions

Hello,

I have two remote offices that I am currently replacing P2P links in and upon review of the routers in the main and remote offices, I noticed that there are tunnel interfaces configured to route via a Loopback interface.  These older circuits are DS3 lines, and the new circuit is a fibre link that is basically metro ethernet between the sites.  My question is, what is the purpose of the tunnel interfaces?  I don't see any crypto lines to enforce encryption or anything like that, the only reason I can see for them would be for QoS reasons since our VoIP system does span the WAN links.  Any input would be appreciated. 

The first office I cut over I used a simple subinterface with Vlan tagging, since that is now the fibre circuit is supposed to work and the line came up fine.  I'm just affraid I am over looking something.  I am good with firewalls and switches, but I don't touch routers every day, so I am looking for a sanity check basically.

Thanks,

Mark

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Cisco Employee

Tunnel Interface Questions

Mark,

Would it be possible to post the configuration of the two routers? It would help us in understanding what the Tunnel interfaces could have been used for.

Best regards,

Peter

Super Bronze

Tunnel Interface Questions

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Posting

As Peter notes, configs might help.  Some reasons for running tunnels include conveying site-to-site routing info or site-to-site multicast.

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