R0106-HP MSR Router Series Layer 2 - WAN Configuration Guide(V7)

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Configuring the ATM AAL5 encapsulation type
ATM AAL5 encapsulation includes the following types:
• aal5snap—Logical Link Control (LLC)/Subnet Access Protocol (SNAP) encapsulation.
• aal5mux—MUX multiplexing encapsulation.
• aal5nlpid—RFC 1490 encapsulation.
Different encapsulations use different formats and support different mappings.
• aal5snap supports IPoA, IPoEoA, PPPoA, and PPPoEoA mappings.
• aal5mux supports IPoA, IPoEoA, PPPoA, and PPPoEoA mappings, but can only support one
protocol at a time.
• aal5nlpid supports IPoA mapping.
Follow these guidelines when you configure ATM AAL5 encapsulation types:
• Devices on the two ends must be configured with the same ATM AAL5 encapsulation types.
• Only aal5snap supports InARP. You cannot configure InARP when aal5mux or aal5nlpid is used.
• Although a PVC or PVC-group can carry multiple protocols, a specific encapsulation type might not
support some of the applications (such as IPoA, IPoEoA, PPPoA, and PPPoEoA). In such cases, the
system displays error prompts.
• When you change the encapsulation type for a PVC or PVC-group, and the mappings that you have
configured conflict with the new encapsulation type, the PVC or PVC-group deletes the
configurations of all conflicting mappings.
To configure the ATM AAL5 encapsulation type:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter ATM interface view
or ATM subinterface view.
interface atm { interface-number |
interface-number.subnumber }
N/A
3. Enter PVC view or
PVC-group view.
• Enter PVC view:
pvc { pvc-name [ vpi/vci ] | vpi/vci }
• Enter PVC-group view:
pvc-group group-number
Use either method.
4. Configure the ATM AAL5
encapsulation type.
encapsulation { aal5mux | aal5nlpid |
aal5snap }
The default encapsulation
type is aal5snap.
Configuring the ATM service type
ATM supports the following service types: CBR, UBR, VBR-RT, and VBR-NRT. You can configure service
types for PVCs, and configure different transmission priorities for PVCs associated with the UBR, VBR-NRT,
and VBR-RT services. A greater value represents a higher priority. PVCs with higher priorities occupy
more bandwidths. PVCs with the same priority occupy the same bandwidths. You cannot configure
transmission priorities for CBR services.
To configure the ATM service type: