Nortel Networks Passport Module 8672A - Manual (Page 26)

26 Chapter 1 About the Passport 8672ATM Module
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RFC 1483 Support
The system software on the Passport 8672ATM Module supports the
configuration of RFC 1483 LAN clients with multiprotocol encapsulation. RFC
1483 supports standards-based methods of encapsulation that enable connectivity
with third-party ATM devices. Multiprotocol encapsulation provides the
capability to set up PVCs between Centillion ATM virtual ports (VPorts) and
other clients based on LLC encapsulation. The current Centillion platform only
supports bridged variations of RFC 1483.
The Passport 8672ATM Module supports the following types of RFC 1483
ELANs:
• RFC 1483 bridged 802.3. The links can be set up within a single device or
with another switch. Multiple RFC 1483 links can be set up within one
ELAN. In all cases, the PVCs must be set up without loops; STP must be
disabled. Both LLC and NULL encapsulation are supported.
• RFC 1483 routed IP and IPX. An RFC 1483 routed VLAN always contains
only one PVC, corresponding to a point-to-point link between routers. The
ATM ELAN is bridged to a single Ethernet VLAN. The software adds and
removes the MAC header, as appropriate. When configuring an IP and IPX
routed circuit, the ATM port must be the only port assigned to the VLAN.
ATM ports do not support bridge/router (BROUTER) configurations.
Physical description
The Passport 8672ATM Module (Figure 1) is a single-slot module for the Passport
8600 Series chassis. Online LEDs indicate module operation.
Figure 1 Passport 8672ATM module
9901EA
Online MDA 2 MDA 1
8672 ATM