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