User manual

11 High-speed ATM configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
11-4 Nortel Networks Inc. Issue 5.3 (
30 March 2009)
When you configure the sub-interface on the interface, you make the interval between running the
shutdown command and running the undo shutdown command at least 15 seconds.
The Secure Router 8012E supports the following ATM interface features:
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Supports Permanent Virtual Circuit (PVC)
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Supports traffic shaping based on VP/VC
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Supports User-to-Network Interface (UNI) signaling
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Supports RFC1483: Multiprotocol Encapsulation over ATM Adaptation Layer 5
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Supports RFC1577: Classical IP and ARP over ATM
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Supports AAL5 (ATM Adaptation Layer 5)
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Supports nonreal-time Variable Bit Rate (nrt_VBR)
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Supports Unspecified Bit Rate (UBR)
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Supports Real-time Variable Bit Rate(rt_VBR)
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Supports Constant Bit Rate(CBR)
The Secure Router 8012E high-speed ATM sub-interface supports the Permanent Virtual Path
(PVP).
11.1.3 ATM applications
The Secure Router 8012E high-speed ATM sub-interface supports PVCs and IPoA
application.
IP over AAL5 (IPoA) bears IP packets.
The AAL5 serves as the data link layer for the communications between IP hosts in the same
network.
11.1.4 references
For more information about the ATM principle, refer to:
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RFC1755: ATM Signaling Support for IP over ATM
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RFC1926: An Experimental Encapsulation of IP Datagrams on Top of ATM
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RFC1932: IP over ATM: A Framework Document
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RFC2684: Multiprotocol Encapsulation over ATM Adaptation Layer 5
11.2 Configuring ATM interfaces
11.2.1 Establishing the configuration task
Applicable environment
The parameters of the ATM interface mainly include the clock mode, frame format, scramble
function and loopback mode. These parameters have default configurations.
ATM sub-interface parameters do not include the clock mode, frame format, scramble
function, and loopback mode and. If these parameters are configured on the ATM main
interface, the sub-interface inherits the parameters automatically.