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New Member

Complex GRE tunnel: Help needed.

Hi All.

Consider the following scenario.

Node A. --->Switch---->C7609--{...Internet..}--C7200--NodeB

Node A has IP 192.168.1.1

Node B has IP 192.168.1.2

So far I have a working gre tunnel between the routers.

How do I get Node A to talk to Node B ?

Any help appreciated.

Thanks,

Ken

5 REPLIES
Hall of Fame Super Gold

Re: Complex GRE tunnel: Help needed.

Hi Ken,
Is this a trick question or are you going to post the config?

Re: Complex GRE tunnel: Help needed.

Consider the following topology

Router1 [S0](64.45.15.17) ------ Internet -------(65.17.89.11)[S0]Router2---192.168.1.0/24
        |_(10.0.0.1)_____________GRE Tunnel____________________(10.0.0.2)_|

Router1
*******

interface Tunnel0
ip address 10.0.0.1 255.255.255.252
tunnel source 64.45.15.17
tunnel destination 65.17.89.11

ip route 192.168.1.0 255.255.255.0 Tunnel0
ip route 65.17.89.11 255.255.255.255 Serial0

Router2
*******

interface Tunnel0
ip address 10.0.0.2 255.255.255.252
tunnel source 65.17.89.11
tunnel destination 64.45.15.17

ip route 64.45.15.17 255.255.255.255 Serial0

hope this helps.
New Member

Re: Complex GRE tunnel: Help needed.

I have the basic tunnel between the cisco routers up but i suspect my whole approach seems wrong.

Node A. --->Switch---->C7609--{...Internet..}--C7200--NodeB

Node A has IP 192.168.1.1

Node B has IP 192.168.1.2

Unfortunatelly the iterfaces are all ethernet and it is the nodes that i need to get to talk.

New Member

Re: Complex GRE tunnel: Help needed.

I have decided to go with an EoMPLSoGRE setup.

So far I have:

the gre tunnel up

the mpls l2transport vc up

the setup is:

asr1004====GRE====c7206

the xconnect is on ge interfaces in the 2 boxes and the ce is a pc on one end and a switch on the other.

My challenge is the vc does not seem to pass any traffic. Specifically when I sh mpls forwarding-table I see no bytes switched.

Also on the c7200 the outgoing interface is 'none'

All assistance will be appreciated.

Cisco Employee

Re: Complex GRE tunnel: Help needed.

The configuration for this is relatively straightforward, so if the code and platform you're operating support the feature you should be fine.

-Configure a GRE Tunnel between your PEs.

-Enable MPLS over Tunnel

-Establish Routing over Tunnel for LDP endpoints

-Verify LDP adjacency

-Configure Pseudowire Class with 'encapsulation mpls'

-Configure the xconnect on the Attachment Circuit.

Validate the state of your vc with the 'show mpls l2transport vc' command.

hth,

jm

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