Cisco 10000 Series Configuration Manual page 551

Chapter 16 Fragmenting and Interleaving Real-Time and Nonreal-Time Packets
FRF.12 Fragmentation
Configuration Examples for Attaching a Map Class to a Frame Relay Interface and Subinterface
Example 16-9 shows how to attach a map class with fragmentation enabled to a Frame Relay interface.
In the example, fragmentation is enabled in the map class named lfi_map_class and the fragment size is
set at 300 bytes. The QoS service policy named policy_13 is also applied to the map class for outbound
traffic. The map class is applied to the serial interface 5/0/0/1:0, which has two subinterfaces configured.
Serial subinterface 5/0/0/1:0.1 has DLCI 17 and subinterface 5/0/0/1:0.2 has DLCI 18. Because the map
class with fragmentation enabled is applied to the main interface, traffic on DLCI 17 and DLCI 18 is
subject to fragmentation and interleaving.
Example 16-9 Attaching a Map Class to a Frame Relay Interface
Router(config)# map-class frame-relay lfi_map_class
Router(config-map-c)# frame-relay fragment 300
Router(config-map-c)# service-policy output policy_13
Router(config-map-c)# no frame-relay adaptive-shaping
!
Router(config)# interface serial 5/0/0/1:0
Router(config-if)# hold-queue 4096 in
Router(config-if)# no ip address
Router(config-if)# no ip directed-broadcast
Router(config-if)# encapsulation frame-relay
Router(config-if)# frame-relay class lfi_map_class
!
Router(config)# interface serial 5/0/0/1:0.1 point-to-point
Router(config-subif)# ip address 192.168.1.1 255.255.255.0
Router(config-subif)# no ip directed-broadcast
Router(config-subif)# frame-relay interface-dlci 17
!
Router(config)# interface serial 5/0/0/1:0.2 point-to-point
Router(config-subif)# ip address 192.168.2.1 255.255.255.0
Router(config-subif)# no ip directed-broadcast
Router(config-subif)# frame-relay interface-dlci 18
Example 16-10 shows how to attach a map class with fragmentation enabled to a subinterface. In the
example, fragmentation is enabled in the map class named lfi_map_class and the fragment size is set at
300 bytes. The QoS service policy named policy_13 is also applied to the map class for outbound traffic.
The map class is applied to the serial subinterface 5/0/0/1:0.1 on which DLCI 17 is configured.
Therefore, Frame Relay traffic on DLCI 17 is subject to fragmentation and interleaving. Because the
lfi_map_class is also attached to serial subinterface 5/0/0/1:0.2, traffic on DLCI 18 is also subject to
fragmentation and interleaving.
If the configuration example specified to apply another map class to subinterface 5/0/0/1:0.2, and that
Note
map class did not enable fragmentation, then DLCI 18 traffic would not be subject to LFI—only
DLCI 17 traffic would be fragmented and interleaved.
Example 16-10 Attaching a Map Class to a Frame Relay Subinterface
Router(config)# map-class frame-relay lfi_map_class
Router(config-map-c)# service-policy output policy_13
Router(config-map-c)# frame-relay fragment 300
Router(config-map-c)# no frame-relay adaptive-shaping
!
Router(config)# interface serial 5/0/0/1:0
Router(config-if)# hold-queue 4096 in
Router(config-if)# no ip address
Router(config-if)# no ip directed-broadcast
Cisco 10000 Series Router Quality of Service Configuration Guide
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