Alcatel-Lucent 7750 SR - Ethernet Interworking VLL; Figure 38: Application of Ethernet Interworking VLL Example

Page 198 7750 SR OS Services Guide
Ethernet Interworking VLL
Figure 38: Application of Ethernet Interworking VLL Example
Figure 38 provides an example of an Ethernet interworking VLL. The Ethernet interworking VLL
provides a point-to-point Ethernet VLL service between Frame-Relay-attached users, ATM
attached users, and Ethernet-attached users across an IP/MPLS packet switched network. It
effectively provides ATM and FR bridged encapsulation termination on the existing Epipe service
of the 7750 SR.
The following connectivity scenarios are supported:
• A Frame Relay or ATM user connected to a ATM network communicating with a Ethernet
user connected to a 7750 PE node on a IP/MPLS network.
• A Frame Relay or ATM user connected to 7750 SR PE node communicating with an
Ethernet user connected to a 7750 PE node on a IP/MPLS network. This feature supports
local cross-connecting when these users are attached to the same 7750 PE node.
Users attach over an ATM UNI with RFC 2684, Multiprotocol Encapsulation over ATM
Adaptation Layer 5, tagged/untagged bridged Ethernet PDUs, a FR UNI using RFC 2427,
Multiprotocol Interconnect over Frame Relay, tagged/untagged bridged Ethernet PDUs, or an
Ethernet tagged/untagged UNI interface. However, the VCI/VPI and the data-link control layer
(DLCI) are the identifiers of the SAP in the case of ATM and FR respectively and the received tags
are transparent to the service and are thus preserved.
The Ethernet pseudowire is established using Targeted LDP (TLDP) signaling and can use the
ether or vlan VC types on the SDP. The SDP can be either an MPLS or GRE type.
ATM
IP/MPLS
IP/IPX
RFC2684
B-PDU
AAL5 ATM
IP/IPX
Ethernet (VLAN)
IP/IPX
Ethernet (VLAN)
EthoMPLS
MPLS
POS/GigE
IP/IPX
RFC2684/RFC2427
B-PDU
AAL5 ATM
FR
CE1
CE2
CE3
PE 1
PE 3
PE 2
CE4
ATM1
ATM2
APS Protected
Links
7750 SR
7750 SR
7750 SR
ATM3
OSSG059
ATM/FR
UNI
PVC/SPVC
Ethernet-MPLS
Network IWF
ATM Switching/
FRF.8.2 IWF
FRF8.2
Interworking
ATM/FR
UNI
Ethernet
(VLAN) UNI
Ethernet
(VLAN) UNI
Ethernet
PW
Ethernet
PW