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Chapter 21
Configuring L2VPN Interworking
Figure 21-1
ATM
CE
In Cisco IOS Release 12.2(33)SB, the Ethernet/VLAN to ATM AAL5 AToM has the following
restrictions:
The following translations are only supported and other translations are dropped:
•
–
–
•
ATM encapsulation type supported for bridged interworking is aal5snap. However, ATM
encapsulation types supported for routed interworking are aal5snap and mux.
The existing QoS functionality for ATM is supported, including setting the ATM CLP bit.
•
Only ATM AAL5 VC mode is supported. ATM VP and port mode are not supported.
•
•
SVCs are not supported.
•
Individual AAL5 ATM cells are assembled into frames before being sent across the pseudowire.
•
Non-AAL5 traffic, (such as OAM cells) is punted to be processed at RP level. A VC that has been
configured with OAM cell emulation on the ATM PE router (using the oam-ac emulation-enable
CLI command) can send end-to-end F5 loopback cells at configured intervals toward the CE router.
When the pseudowire is down, an F5 end-to-end segment AIS/RDI (Alarm indication signal/Remote
•
defect indication) is sent from the PE router to the CE router.
If the Ethernet frame arriving from Ethernet CE includes a 802.1Q header (VLAN header), due to
•
the type of endpoint attachment (Ethernet port mode), the VLAN header stays in the frame across
the pseudowire
OL-2226-23
Protocol Stack for ATM AAL5 to Ethernet Local Switching Bridged
Interworking—With VLAN Header
ATM
PE
ATM Header
LLC
(AA-AA)
LLC(03) OUI (00)
OUI
(80-C2)
PID
(00-07)
PAD
(00-00)
MAC Header
DA
SA
Ethertype 81-00
Ethertype 81-00
VLAN Tag
VLAN Tag
Type/Length
Type/Length
Remainder of
Remainder of
MAC Frame
MAC Frame
CPCS - UU CPI
LAN FCS
Length
CRC
Ethernet without LAN FCS (AAAA030080C200070000)
Spanning tree (AAAA030080C2000E)
(Figure
21-2).
Ethernet
Eth
CE
MAC Header
DA
SA
Cisco 10000 Series Router Software Configuration Guide
Ethernet/VLAN to ATM AAL5 Interworking
21-7
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