H3C Technologies H3C SR8800 - Manual (Page 66)

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Step Command Remarks
3. Configure a virtual circuit on
the interface.
fr dlci dlci-number
By default, no virtual circuits are
created on interfaces.
NOTE:
If the DLCI of a PVC is changed on the DCE interface, you can reset both the DCE and DTE interfaces or
execute the reset inarp command on both ends to enable the DTE to re-learn the correct address mappings
as soon as possible. Before doing that, make sure that no services will be interrupted.
Configuring frame relay subinterface
Overview
Frame relay offers the following types of interfaces: main interface and subinterface. The subinterface is
of logical structure, which can be configured with protocol address and virtual circuit. One physical
interface can include multiple subinterfaces, which do not exist physically. However, for the network layer,
the subinterface and main interface make no difference and both can be configured with virtual circuits
to connect to remote routers.
The subinterface of frame relay falls into the following types: point-to-point (P2P) subinterface and
point-to-multipoint (P2MP) subinterface. A P2P subinterface connects a single remote router and a P2MP
subinterface connects multiple remote routers. A P2MP subinterface can be configured with multiple
virtual circuits, each of which sets up an address map with its connected remote network address to
distinguish different connections. Address maps can be set up manually or dynamically set up by InARP.
The methods to configure a virtual circuit and address map for P2P subinterfaces and P2MP
subinterfaces are different, as described below.
• P2P subinterface
Because a P2P subinterface has only one peer address, the peer address is implicitly determined
when a virtual circuit is configured for the subinterface. As a result, you do not need to configure
dynamic or static address mapping for P2P subinterface.
• P2MP subinterface
For a P2MP subinterface, a peer address can be mapped to the local DLCI through static address
mapping or InARP which only needs to be configured on the main interface. If static address
mapping is required, it is necessary to set up static address map for each virtual circuit.
Configuration procedure
To configure a frame relay subinterface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a subinterface and
enter subinterface view.
interface interface-type
interface-number.subnumber
[ p2mp | p2p ]
By default, no frame relay
subinterface is created. On
creation, the type of a frame relay
subinterface is p2mp by default.
3. Configure a virtual circuit on
a frame relay subinterface. See “ Configuring frame relay local
virtual circuit .”
N/A