EoMPLS

EoMPLS

EoMPLS is the most popular form of VPWS/AToM.
Some unneeded headers are removed from the frame in transit.
  • Preamble and Start of Frame Delimiter (SFD)
  • Frame Check Sequence (FCS)
In Ethernet port mode, all VLAN information is transmitted, but the VLAN tag may be overwritten on the egress PE
 
Ethernet Virtual Circuits (EVCs) define aspects of attachment and virtual circuits
  • Frame matching based on one or more VLAN tags
  • Optional VLAN tag manipulation
  • Traffic forwarding
  • Additional services, such as QoS policies
 
Redundancy for the tunnel
  • Redundant remote PE routers
  • Redundant attachment circuits to the CE
  • Redundant Pseudowires
If the path between the PE routers can be repaired with the IGP, the original PW will be rerouted.
If the failure prevents repair of the primary PW, it will switch to the backup PW
two-way redundancy there are two PEs on both sides
  • Full mesh of PW
  • Only one PW will be active, the rest are in standby
  • Requires Multi-Chassis Link Aggregation Group (MC-LAG)
  • Interchassis Communication Protocol (ICCP) is used to form the redundancy groups
 
IOS-XR
int g0/0/0/0.10 l2transport encapsulation dot1q 10 mtu 1514 int g0/0/0/0.999 l2transport encapsulation untagged mtu 1514 l2vpn xconnect group CustB_VPN p2p tag 10 interface g0/0/0/0.10 nei ipv4 10.5.5.5 pw-id 10 p2p untagged interface g0/0/0/0.999 nei ipv4 10.5.5.5 pw-id 999 show l2vpn xconnect show l2vpn xconnect interface g0/0/0/0.10 detail
IOS-XE
int g4 service instance 10 ethernet encapsulation dot1q 10 service instance 999 ethernet encapsulation untagged l2vpn xconnect context tag10 member pseudowire 10 10.2.2.2 10 encapsulation mpls member g4 service-instance 10 l2vpn xconnect context untagged member pseudowire 999 10.2.2.2 999 encapsulation mpls member g4 service-instance 999 show l2vpn atom vc show l2vpn atom vc vcid 10