Fr Dlci To Ethernet Vlan 802.1Q Atom-Bridged Interworking - Cisco 10000-2P2-2DC Software Configuration Manual

Chapter 21 Configuring L2VPN Interworking
Figure 21-14
FR
CE
FR DLCI to Ethernet VLAN 802.1Q AToM—Bridged Interworking
This interworking type provides interoperability between FR attachment VC and Ethernet VLAN
Attachment VC connected to different PE routers. The bridged encapsulation is used, corresponding to
the Bridged (Ethernet) Interworking mechanism.
The interworking function is performed in the same way as for FR to Ethernet port case, implemented
on the PE connected to the FR attachment VC, based upon a multiprotocol interconnect over Frame
Relay (see
As in the ATM to VLAN case, one difference exists on Ethernet side due the existence of the VLAN
header in the incoming packet. The PE on the VLAN side discards the VLAN header of the incoming
frames from the VLAN CE, and the PE inserts a VLAN header into the Ethernet frames traveling from
the MPLS cloud. The frames sent on the pseudowire (with VC type 5) are Ethernet frames without the
VLAN header.
The
Figure 21-15
FR
CE
OL-2226-23
Protocol Stack for FR to Ethernet AToM Bridged Interworking—Without VLAN Header
FR Link
FR
PE
Q.922 Address
Ctrl (03) Pad (00)
NLPD (80) OUI (00)
OUI (80-C2)
PID (00-07)
MAC Header
DA
SA
Type/Length
Remainder of
MAC Frame
FCS
Figure 21-14).
Figure 21-15 shows the protocol stack for FR to VLAN AToM Bridged Interworking.
Protocol Stack for FR to VLAN AToM Bridged Interworking
FR Link
FR
PE
Q.922 Address
Ctrl (03) Pad (00)
NLPD (80) OUI (00)
OUI (80-C2)
PID (00-07)
MAC Header
DA
SA
Type/Length
Remainder of
MAC Frame
FCS
MPLS Emulated VC of
Tunnel Label
VC Label
Control Word
MAC Header
DA
SA
Type/Length
Remainder of
MAC Frame
MPLS Emulated VC of
Tunnel Label
VC Label
Control Word
MAC Header
DA
SA
Type/Length
Remainder of
MAC Frame
Cisco 10000 Series Router Software Configuration Guide
Ethernet/VLAN to Frame Relay Interworking
Ethernet
Eth
PE
Tunnel Label
VC Label
Control Word
MAC Header MAC Header
DA DA
SA SA
Type/Length Type/Length
Remainder of Remainder of
MAC Frame MAC Frame
LAN FCS
Ethernet
Eth
PE
Tunnel Label
VC Label
MAC Header
Control Word
DA
MAC Header
SA
DA
SA
Ethertype 81-00
VLAN Tag
Type/Length Type/Length
Remainder of Remainder of
MAC Frame MAC Frame
LAN FCS
Eth
VLAN
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