Figure e-4 – Cisco OL-21636-01 User Manual
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Cisco IP Solution Center L2VPN and Carrier Ethernet User Guide, 6.0
OL-21636-01
Appendix E ISC Layer 2 VPN Concepts
L2VPN Service Provisioning
For the N-PE that is serving Site A, a VLAN interface (Layer 3 interface) is created to terminate all L2
traffic for the customer, and an EoMPLS tunnel is configured on this interface.
Note
This configuration is based on the Cisco 7600 Optical Services Router. Other routers, such as the Cisco
7200, have different configurations.
The VC ID that defines the EoMPLS tunnel is 200. (See
Figure E-4
Ethernet over MPLS Configuration
Note that the VC ID has to be the same on both ends of the EoMPLS tunnel. On each N-PE, there is
mapping done between the VLANs to the EoMPLS tunnel. (See
.)
Figure E-5
EoMPLS Tunnel
For the overall connection, this mapping is: VLAN ID <-> VC ID <-> VLAN ID.
138358
N_PE1
10.1.1.1
N_PE2
10.2.2.2
VLAN 100
VLAN 200
VC ID must match
VC ID must be unique
between PE-POP pairs
MPLS Core
N_PE1
interface loopback0
ip address 10.1.1.1/32
mpls label protocol ldp
mpls ldp router-id loopback0
interface vlan 100
mpls 12transport route 10.2.2.2 200
N_PE2
interface loopback0
ip address 10.2.2.2/32
mpls label protocol ldp
mpls ldp router-id loopback0
interface vlan 200
mpls 12transport route 10.1.1.1 200
97072
Mapping VLAN ID to VC ID
7
VLAN 200
7
VLAN 100
Mapping VC ID to VLAN ID
VC ID = 7
Two mapping tables: VLAN ID <-> VC ID