AS on-top of another AS

[mazlan.alatif]

Hi,

Have anyone here tried or have any idea how to run one AS on top of another AS?

I would like to use my current backbone network (AS1)and run another AS (AS2) on the same infra.

example:

physical

========

RA--R1--R2---RB

logical

-------

R1--[AS1]--R2

RA--[AS2]--RB (on top of AS1)

I am thinking of EoMPLS using cat3750. Maybe you guys have any brilliant idea to that I can just use router to do the trick.

Your ideas and help is higly appricated.

Thank..

--mazlan

[pkhatri]

Hi Mazlan,

One simple option is to create a GRE tunnel between RA and RB and then run BGP directly between RA and RB using AS2. You will not need to change anything on R1 or R2 at all.

Hope that helps - pls rate the post if it does.

Paresh

[sbhadrav@cisco.com]

Use the no mpls l2transport route destination vc-id or no xconnect destination vc-id encapsulation
mpls interface command to delete the EoMPLS tunnel.
This example shows how to configure an EoMPLS tunnel between switch PE1’s VLAN 3 interface and
PE2’s VLAN 4 interface.
PE1 has an IP address 10.0.0.1/32, and PE2 has IP address 20.0.01/32. Both provider-edge routers are
configured with an MPLS connection to the MPLS core. The VC ID is 123.
Enter these commands on the PE1 switch:
Switch(config)# interface loopback0
Switch(config-if)# ip address 10.10.10.10 255.255.255.255
Switch(config-if)# exit
Switch(config)# interface vlan 3
Switch(config-if)# mpls l2transport route 20.0.0.1 123
Enter these commands on the PE2 switch:
Switch(config)# interface loopback0
Switch(config-if)# ip address 20.20.20.20 255.255.255.255
Switch(config-if)# exit
Switch(config)# interface vlan 4
Switch(config-if)# mpls l2transport route 10.0.0.1 123