Vlans through T1 link

[rcasta]

Back on december 2002 someone posted the above quoted paragraph. Knowing beforehand that some of you may think "why the h*ll do you want to go over it?" I kindly ask to let know your comments whatsoever.

SW vlan2--\ / SWvl2
SWCR1--dotq1--ROUTER1--T1--ROUTER2--dot1q--SWCR2
SW vlan3--/ \ SWvl3

Diagram explanation: SwitchCR1 has 2 access ports configured with vlans 2 and 3. It has a third port making trunking with Router1. Router1, according to the configuration hereafter posted, forwards 8021q traffic over T1 link. Router2 receives it and send it to SwitchCR2 which has 2 access ports with vlans 2 and 3. The latter ports finally lead to appropriate SwitchVlan2 and SwitchVlan3 devices.

Host side:
interface FastEthernet0/0.1
encapsulation dot1Q 2
no ip route-cache
no ip mroute-cache
bridge-group 1

interface FastEthernet0/0.2
encapsulation dot1Q 3
no ip route-cache
no ip mroute-cache
bridge-group 1

interface Serial0/0
no ip address
encapsulation frame-relay
no ip route-cache
no ip mroute-cache
no fair-queue

interface Serial0/0.1 point-to-point
no ip route-cache
no ip mroute-cache
frame-relay interface-dlci 20
bridge-group 1

Remote side:

frame-relay switching

interface FastEthernet0/0.1
encapsulation dot1Q 2
no ip route-cache
no ip mroute-cache
bridge-group 1

interface FastEthernet0/0.2
encapsulation dot1Q 3
no ip route-cache
no ip mroute-cache
bridge-group 1

interface Serial0/0
no ip address
encapsulation frame-relay
no ip route-cache
no ip mroute-cache
no fair-queue
frame-relay intf-type dce
!
interface Serial0/0.1 point-to-point
no ip route-cache
no ip mroute-cache
frame-relay interface-dlci 20
bridge-group 1

bridge 1 protocol ieee


LOOKING FORWARD TO HEARING YOUR COMMENTS,

 

[routerman]

The posted configuration will allow bridging between the VLANs, and will also allow bridging across the WAN.

But I think the inference is that this configuration will pass the 802.1q VLAN tags across as well, which I'm pretty sure it wont. This is where you need MPLS.

I found the following URL which is of interest, about bridging between vlans.

http://www.cisco.com/en/US/products...ts_feature_guide09186a008008019c.html#1023643

Your thoughts?

 

[rcasta]

routerman,

Yeah, my intention, as you keenly remarked, is passing the 802dot1q tags across the T1 link. So you say by using MPLS I will accomplish this task?

Let me look into the link provided.

thank you!