GRE TUNNEL/Ethernet-broadcast-like?

[rcasta]

Hello,

A question barely came up to mind: Would it be possible to "join" a broadcast domain, not by means of a LAN switch but from one remote router to another, using GRE Tunnels?

Since I haven't done it before, I kind of thought that it'll be possible. For instance, having:

R1eth0(no ip address)--GRE TUNNEL-Ser0--CLOUD--GRE_TUNN--
Ser1---R2eth0(no ip address)

Under this scenario, couldn't R1's eth0 be also part of R2's eth0 broadcast domain? If it's possible, how could the config be like?

Best regards,

 

[rcasta]

Thinking of it, I guess my intention is to build a BRIDGE over the GRE tunnel...isn't it?

best regards,

 

[routerman]

I looked at doing this some time ago, when I investigated this I couldn't find any reason why it wouldnt work. However when I applied the config I got a message stating that it was an unsupported option, I think that's Cisco's way of saying your on your own with this one!

I wanted to pass IPX packets that didnt have L3, so had to use the bridge option. It didnt work very well.

 

[rcasta]

That sounds like bad news. What config did you apply?

any pointers will help,

thank you,

 

[rcasta]

My last,sadly unsuccessful configuration:

R1
int Tunnel 10
no ip address
tunnel source R1_Serial0
tunnel destination R2_Serial0
bridge-group 1
(when configuring the latter this happened
R1(config-if)#bridge-group 1
% This command is an unreleased and unsupported feature
)

int ethernet 0
no ip address
bridge-group 1

int ser0
ip address 192.168.1.1/30

bridge 1 protocol ieee
-----------------------------------------------------
R2

bridge irb

int Tunnel 10
no ip address
tunnel source R2_Serial0
tunnel destination R1_Serial0
bridge-group 1

int ethernet 0
no ip address
bridge-group 1

int ser0
ip address 192.168.1.2/30

int bvi 1
ip address 172.18.1.1/24

bridge 1 protocol ieee
bridge 1 route ip

Any thoughts or comments on this?