EoMPLS Carrying Ethernet Trunk
EoMPLS Carrying Ethernet Trunk
Network topology:
Here, the AC is an Ethernet Trunk. The CE interfaces connected to PE routers are configured with 802.1Q sub-interfaces. Hence, the Ethernet frames are tagged when the PE router receives them. This results in a PE router carrying the whole 802.1Q trunk across the MPLS Pseudowire.
Configuration:
The CE routers are configured with 802.1Q sub-interfaces.
CE Configuration
interface Fastethernet 0/0
no ip address
!
interface Fastethernet 0/0.100
encapsulation dot1q 100
ip address 10.100.1.1 255.255.255.252
!
interface Fastethernet 0/0.200
encapsulation dot1q 200
ip address 10.200.1.1 255.255.255.252
!
CE1# show ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES manual up up
FastEthernet0/0.100 10.100.1.1 YES manual up up
FastEthernet0/0.200 10.200.1.1 YES manual up up
FastEthernet0/1 unassigned YES NVRAM administratively down down
CE2# show ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES NVRAM up up
FastEthernet0/0.100 10.100.1.2 YES manual up up
FastEthernet0/0.200 10.200.1.2 YES manual up up
FastEthernet0/1 unassigned YES NVRAM administratively down down
The PE configuration remain similar to EoMPLS Carrying Simple Ethernet.
PE Configuration
PE1 router:
pseudowire-class MPLS_Encapsulation
encapsulation mpls
!
interface Loopback 0
ip address 1.1.1.1 255.255.255.255
ip ospf 1 area 0
!
interface Fastethernet 0/0
description Connected to CE1
no ip address
xconnect 3.3.3.3 2000 pw-class MPLS_Encapsulation
!
PE2 router:
interface Loopback 0
ip address 3.3.3.3 255.255.255.255
ip ospf 1 area 0
!
interface Fastethernet 0/0
description Connected to CE2
no ip address
xconnect 1.1.1.1 2000 encapsulation mpls
!
VC Status verification:
The debug mpls l2transport signalling message command displays the VC labels exchanged between peers after the targeted-LDP session is established. It also shows each peer sends a Label Mapping message which contains FEC TLV, Label TLV and optional interface parameters. VC Type 5 indicates Ethernet Port mode.
Label Mapping message exchange
00:47:08.747: AToM LDP [3.3.3.3]: Sending label mapping msg
00:47:08.751: AToM LDP [3.3.3.3]: Sending label mapping msg vc type 5, cbit 1, vc id 2000, group id 0, vc label 16, status 0x7/LDP 0x1/ADJ 0x0, mtu 1500, vc handle 0x64000001
00:47:08.787: AToM LDP [3.3.3.3]: Received label mapping msg, id 17, GR instance 2
00:47:08.787: AToM LDP [3.3.3.3]: Received label mapping msg, id 17, GR instance 2 vc type 5, cbit 1, vc id 2000, group id 0, vc label 16, status 0x7/LDP 0x1/ADJ 0x0, mtu 1500, vc handle 0x64000001
The VC status can be verified as below. It also shows the Labels exchanged and Label stack that will be imposed on packets transported over L2 circuit.
VC status verification
PE1# show mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Fa0/0 Ethernet 3.3.3.3 2000 UP
PE1# show mpls l2transport vc detail
Local interface: Fa0/0 up, line protocol up, Ethernet up
Destination address: 3.3.3.3, VC ID: 2000, VC status: up
Output interface: Fa1/0, imposed label stack {17 16}
Preferred path: not configured
Default path: active
Next hop: 10.1.1.2
Create time: 00:11:30, last status change time: 00:01:03
Signaling protocol: LDP, peer 3.3.3.3:0 up
Targeted Hello: 1.1.1.1(LDP Id) -> 3.3.3.3, LDP is UP
Status TLV support (local/remote) : enabled/supported
LDP route watch : enabled
Label/status state machine : established, LruRru
Last local dataplane status rcvd: No fault
Last local SSS circuit status rcvd: No fault
Last local SSS circuit status sent: No fault
Last local LDP TLV status sent: No fault
Last remote LDP TLV status rcvd: No fault
Last remote LDP ADJ status rcvd: No fault
MPLS VC labels: local 16, remote 16
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
Control Word: On (configured: autosense)
VC statistics:
transit packet totals: receive 7, send 7
transit byte totals: receive 726, send 903
transit packet drops: receive 0, seq error 0, send 0
The following packet capture shows the label imposed on IP packets transported over the L2 circuit.