Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Руководство по настройке

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Map Class
Within Frame Relay, a map class acts as a container or context for fragmentation
and reassembly parameters. Within the map class context, you can explicitly enable
fragmentation and reassembly.
After you define a map class, you can apply it to an unlimited number of
subinterfaces. This allows you to change fragmentation and reassembly parameters
one time and have the changes immediately reflected in all subinterfaces configured
to use that map class.
Configuring End-to-End Fragmentation
You configure end-to-end fragmentation and reassembly on a subinterface in much
the same way you configure a standard Frame Relay interface. In this example,
end-to-end fragmentation and reassembly is configured on a single subinterface with
a 100-byte fragment size (maximum payload size). All tasks are mandatory unless
otherwise noted.
NOTE: The procedure described in this section assumes that a physical interface has
been configured. See “Before You Configure Frame Relay” on page 110.
To configure end-to-end fragmentation and reassembly:
1.
Create a map class that you can apply to subinterfaces.
host1(config)# map-class frame-relay testmap
2.
Specify fragmentation and reassembly for the map class. Optionally, you can
specify the maximum payload size of a fragment.
host1(config-map-class)# frame-relay fragment 100
3.
Enter the physical interface on which you want to configure Frame Relay
end-to-end fragmentation and reassembly.
host1(config-map-class)# interface serial 5/0:4/1
4.
Select Frame Relay as the encapsulation method for the interface.
host1(config-if)# encapsulation frame-relay ietf
5.
Create a subinterface.
host1(config-if)# interface serial 5/0:4/1.1
6.
Add a circuit to a subinterface.
host1(config-subif)# frame-relay interface-dlci 16 ietf
7.
Assign a local IP address to the circuit.
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End-to-End Fragmentation and Reassembly
JUNOSe 11.1.x Link Layer Configuration Guide