Map Class; Configuring End-To-End Fragmentation - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - LINK LAYER CONFIGURATION GUIDE 2010-10-13 Configuration Manual

Map Class

Configuring End-to-End Fragmentation

Copyright © 2010, Juniper Networks, Inc.
If the frame is not a fragment, it is forwarded normally.
If the frame is a fragment and the upper interface is IP (that is, the interface above the
Frame Relay subinterface), then the fragment is immediately discarded.
If you enable reassembly, then received fragments undergo the reassembly process.
Packets that are not fragments are forwarded as normal.
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.
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 108.
To configure end-to-end fragmentation and reassembly:
Create a map class that you can apply to subinterfaces.
1.
host1(config)#map-class frame-relay testmap
Specify fragmentation and reassembly for the map class. Optionally, you can specify
2.
the maximum payload size of a fragment.
host1(config-map-class)#frame-relay fragment 100
Enter the physical interface on which you want to configure Frame Relay end-to-end
3.
fragmentation and reassembly.
host1(config-map-class)#interface serial 5/0:4/1
Select Frame Relay as the encapsulation method for the interface.
4.
host1(config-if)#encapsulation frame-relay ietf
Create a subinterface.
5.
host1(config-if)#interface serial 5/0:4/1.1
Add a circuit to a subinterface.
6.
host1(config-subif)#frame-relay interface-dlci 16 ietf
Chapter 2: Configuring Frame Relay
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