EoMPLS - Ethernet over MPLS
EoMPLS encapsulates ethernet frames in MPLS packets and forwards them across the MPLS network. Each frame is transported as a single packet, and the PE routers connected to the backbone add and remove labels as appropriate for packet encapsulation
EoMPLS Operation
The ingress PE router receives an Ethernet frame and encapsulates the packet by removing the preamble, the start of frame delimiter (SFD), and the frame check sequence (FCS). The rest of the packet header is not changed.
The ingress PE router adds a point-to-point virtual connection (VC) label and a label switched path (LSP) tunnel label for normal MPLS routing through the MPLS backbone.
The network core routers use the LSP tunnel label to move the packet through the MPLS backbone and do not distinguish Ethernet traffic from any other types of packets in the MPLS backbone.
At the other end of the MPLS backbone, the egress PE router receives the packet and de-encapsulates the packet by removing the LSP tunnel label if one is present. The PE router also removes the VC label from the packet.
The PE router updates the header, if necessary, and sends the packet out the appropriate interface to the destination switch.
EoMPLS Type 1 - Port mode
Allows all traffic on a port to share a single VC across an MPLS networkTopology
Configurations
CE1#show running-config
vlan 455
name PPPoE-H1-40fl
interface GigabitEthernet4/0/0
switchport
switchport trunk allowed vlan 455
switchport mode trunk
no mls qos trust
interface Vlan455
ip address 192.168.14.1 255.255.255.0
PE1#show running-config
mpls ldp router-id Loopback0
mpls ip
vlan 455
name PPPoE-H1-40fl
interface Loopback0
ip address 192.168.22.22 255.255.255.255
interface GigabitEthernet3/0/0
no ip address
negotiation auto
interface GigabitEthernet3/0/0.1
encapsulation dot1Q 455
xconnect 192.168.33.33 455 encapsulation mpls
interface GigabitEthernet3/1/0
ip address 192.168.23.2 255.255.255.0
negotiation auto
mpls ip
router ospf 1
router-id 2.2.2.2
log-adjacency-changes detail
network 192.168.0.0 0.0.255.255 area 0
PE2#show running-config
mpls ldp router-id Loopback0
mpls ip
vlan 455
name PPPoE-H1-40fl
interface Loopback0
ip address 192.168.33.33 255.255.255.255
interface GigabitEthernet4/0/0
ip address 192.168.23.3 255.255.255.0
mpls ip
mls qos trust dscp
interface GigabitEthernet6/2.1
encapsulation dot1Q 455
xconnect 192.168.22.22 455 encapsulation mpls
router ospf 1
router-id 3.3.3.3
network 192.168.0.0 0.0.255.255 area 0
CE2#show running-config
vlan 455
name PPPoE-H1-40fl
interface GigabitEthernet3/3
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 455
switchport mode trunk
interface Vlan455
ip address 192.168.14.4 255.255.255.0
Configurations Verification
Checking MPLS link on PE1 and PE2PE1#show mpls ldp bindings 192.168.33.33 32
lib entry: 192.168.33.33/32, rev 6
local binding: label: 17
remote binding: lsr: 192.168.33.33:0, label: imp-null
PE2#show mpls ldp bindings 192.168.22.22 32
lib entry: 192.168.22.22/32, rev 6
local binding: label: 17
remote binding: lsr: 192.168.22.22:0, label: imp-null
Checking MPLS connectivity on PE1 and PE2
PE1#ping mpls ipv4 192.168.33.33 255.255.255.255
Sending 5, 100-byte MPLS Echos to 192.168.33.33/32,
timeout is 2 seconds, send interval is 0 msec:
Type escape sequence to abort.
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
Checking MPLS forwarding table on PE1 and PE2 to see if the VC labels are present
PE1#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
17 Pop Label 192.168.33.33/32 160 Gi3/1/0 192.168.23.3
18 No Label l2ckt(8193) 282808 Gi3/0/0.1 point2point
PE2#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label l2ckt(1) 132 Gi6/2.1 point2point
17 Pop Label 192.168.22.22/32 0 Gi4/0/0 192.168.23.2
Checking L2 VC on PE1 and PE2
PE1#show mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Gi3/0/0.1 Eth VLAN 455 192.168.33.33 455 UP
PE1#show mpls l2transport vc 455 detail
Local interface: Gi3/0/0.1 up, line protocol up, Eth VLAN 455 up
Destination address: 192.168.33.33, VC ID: 455, VC status: up
Output interface: Gi3/1/0, imposed label stack {16}
Preferred path: not configured
Default path: active
Next hop: 192.168.23.3
Create time: 02:54:21, last status change time: 02:22:16
Signaling protocol: LDP, peer 192.168.33.33:0 up
Targeted Hello: 192.168.22.22(LDP Id) -> 192.168.33.33, 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 BFD dataplane status rcvd: Not sent
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 18, remote 16
PWID: 8193
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
Control Word: Off (configured: autosense)
VC statistics:
transit packet totals: receive 4264, send 2
transit byte totals: receive 289948, send 132
transit packet drops: receive 0, seq error 0, send 0
PE2#show mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Gi6/2.1 Eth VLAN 455 192.168.22.22 455 UP
PE2#show mpls l2transport vc 455 detail
Local interface: Gi6/2.1 up, line protocol up, Eth VLAN 455 up
Interworking type is Ethernet
Destination address: 192.168.22.22, VC ID: 455, VC status: up
Output interface: Gi4/0/0, imposed label stack {18}
Preferred path: not configured
Default path: active
Next hop: 192.168.23.2
Create time: 02:53:28, last status change time: 02:22:52
Last label FSM state change time: 02:22:52
Signaling protocol: LDP, peer 192.168.22.22:0 up
Targeted Hello: 192.168.33.33(LDP Id) -> 192.168.22.22, 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 BFD dataplane status rcvd: Not sent
Last BFD peer monitor status rcvd: No fault
Last local AC circuit status rcvd: No fault
Last local AC circuit status sent: No fault
Last local PW i/f circ status rcvd: 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 18
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
Control Word: Off (configured: autosense)
SSO Descriptor: 192.168.22.22/455, local label: 16
Dataplane:
SSM segment/switch IDs: 4097/4096 (used), PWID: 1
VC statistics:
transit packet totals: receive 2, send 4286
transit byte totals: receive 132, send 351434
transit packet drops: receive 0, seq error 0, send 0
Checking L2 xconnect on PE1 and PE2
PE2#show xconnect interface GigabitEthernet 6/2.1
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP pri ac Gi6/2.1:455(Eth VLAN) UP mpls 192.168.22.22:455 UP
PE1#show xconnect interface GigabitEthernet 3/0/0.1
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP ac Gi3/0/0.1:455(Eth VLAN) UP mpls 192.168.33.33:455 UP
Segment 1 is the attach circuit (ie PE CE link)
Segment 2 is the core circuit (ie PE PE link)
Checking the L2 VC binding
PE1#show mpls l2transport binding 455
Destination Address: 192.168.33.33, VC ID: 455
Local Label: 18
Cbit: 0, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
Remote Label: 16
Cbit: 0, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
PE2#show mpls l2transport binding 455
Destination Address: 192.168.22.22,VC ID: 455
Local Label: 16
Cbit: 0, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
Remote Label: 18
Cbit: 0, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
Pinging from CE1 to CE2 to confirm the VC functionality
CE1#ping 192.168.14.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.14.4, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/1 ms
CE1#
EoMPLS Type 2 - VLAN mode
Transports Ethernet traffic from a source 802.1Q VLAN to a destination 802.1Q VLAN through a single VC over an MPLS networkTopology
Configurations
CE1#show running-config
vlan 455
name PPPoE-H1-40fl
interface TenGigabitEthernet2/1
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 455
switchport mode trunk
interface Vlan455
ip address 192.168.14.1 255.255.255.0
PE1#show running-config
mpls ldp router-id Loopback0
mpls ip
vlan 455
name PPPoE-H1-40fl
interface Loopback0
ip address 192.168.22.22 255.255.255.255
interface TenGigabitEthernet2/0/0
switchport
switchport trunk allowed vlan 455
switchport mode trunk
no mls qos trust
interface GigabitEthernet3/1/0
ip address 192.168.23.2 255.255.255.0
negotiation auto
mpls ip
interface Vlan455
no ip address
xconnect 192.168.33.33 455 encapsulation mpls
router ospf 1
router-id 2.2.2.2
log-adjacency-changes detail
network 192.168.0.0 0.0.255.255 area 0
PE2#show running-config
mpls ldp router-id Loopback0
mpls ip
vlan 455
name PPPoE-H1-40fl
interface Loopback0
ip address 192.168.33.33 255.255.255.255
interface GigabitEthernet4/0/0
ip address 192.168.23.3 255.255.255.0
mpls ip
mls qos trust dscp
interface GigabitEthernet6/2
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 455
switchport mode trunk
interface Vlan455
no ip address
xconnect 192.168.22.22 455 encapsulation mpls
router ospf 1
router-id 3.3.3.3
network 192.168.0.0 0.0.255.255 area 0
CE2#show running-config
vlan 455
name PPPoE-H1-40fl
interface GigabitEthernet3/3
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 455
switchport mode trunk
interface Vlan455
ip address 192.168.14.4 255.255.255.0
Configurations Verification
Checking MPLS link on PE1 and PE2PE1#show mpls ldp bindings 192.168.33.33 32
lib entry: 192.168.33.33/32, rev 6
local binding: label: 17
remote binding: lsr: 192.168.33.33:0, label: imp-null
PE2#show mpls ldp bindings 192.168.22.22 32
lib entry: 192.168.22.22/32, rev 6
local binding: label: 17
remote binding: lsr: 192.168.22.22:0, label: imp-null
Checking MPLS connectivity on PE1 and PE2
PE1#ping mpls ipv4 192.168.33.33 255.255.255.255
Sending 5, 100-byte MPLS Echos to 192.168.33.33/32,
timeout is 2 seconds, send interval is 0 msec:
Type escape sequence to abort.
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
Checking MPLS forwading table on PE1 and PE2 to see if the VC labels are present
PE1#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label l2ckt(4096) 556 Vl455 point2point
17 Pop Label 192.168.33.33/32 0 Gi3/1/0 192.168.23.3
PE2#show mpls forwarding-table
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label l2ckt(1) 624 Vl455 point2point
17 Pop Label 192.168.22.22/32 0 Gi4/0/0 192.168.23.2
Checking L2 VC on PE1 and PE2
PE1#show mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
Vl455 Eth VLAN 455 192.168.33.33 455 UP
PE1#show mpls l2transport vc 455 detail
Local interface: Vl455 up, line protocol up, Eth VLAN 455 up
Destination address: 192.168.33.33, VC ID: 455, VC status: up
Output interface: Gi3/1/0, imposed label stack {16}
Preferred path: not configured
Default path: active
Next hop: 192.168.23.3
Create time: 00:22:09, last status change time: 00:17:41
Signaling protocol: LDP, peer 192.168.33.33:0 up
Targeted Hello: 192.168.22.22(LDP Id) -> 192.168.33.33, 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 BFD dataplane status rcvd: Not sent
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
PWID: 4096
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
MAC Withdraw: sent:1, received:0
Sequencing: receive disabled, send disabled
Control Word: On (configured: autosense)
VC statistics:
transit packet totals: receive 5, send 6
transit byte totals: receive 556, send 624
transit packet drops: receive 0, seq error 0, send 0
Checking L2 xconnect on PE1 and PE2
PE2#show xconnect interface Vlan 455
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP pri ac Vl455:455(Eth VLAN) UP mpls 192.168.22.22:455 UP
PE1#show xconnect interface Vlan 455
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP ac Vl455:455(Eth VLAN) UP mpls 192.168.33.33:455 UP
Segment 1 is the attach circuit (ie PE CE link)
Segment 2 is the core circuit (ie PE PE link)
Checking the L2 VC binding
PE1#show mpls l2transport binding 455
Destination Address: 192.168.33.33, VC ID: 455
Local Label: 16
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
Remote Label: 16
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
PE2#show mpls l2transport binding 455
Destination Address: 192.168.22.22,VC ID: 455
Local Label: 16
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
Remote Label: 16
Cbit: 1, VC Type: Ethernet, GroupID: 0
MTU: 1500, Interface Desc: n/a
VCCV: CC Type: CW [1], RA [2], TTL [3]
CV Type: LSPV [2], BFD/Raw [5]
Pinging from CE1 to CE2 to confirm the VC functionality
CE1#ping 192.168.14.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.14.4, timeout is 2 seconds:
!!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/1 ms
CE1#
prajsree[at]gmail.com
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