Cisco OSM-12CT3/T1 - Optical Services Module Multiplexor Configuration page 13

Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules
Assigning an Interface to a Multilink Bundle
To assign an interface to a multilink bundle, use the following commands in interface configuration
mode:
Command
Step 1
Router(config)# interface serial
slot/port/DS0 number: channel-group number
Step 2
Router(config-if)# no ip address
Step 3
Router(config-if)# encapsulation ppp
Step 4
Router(config-if)# multilink-group
bundle-id
Step 5
Router(config-if)# ppp authentication chap
Step 6
Router(config-if)# ppp chap hostname name
The following example shows how to create a multilink interface and add it to a multilink bundle:
Router(config)# interface serial 1/0/0:1
Router(config-if)# no ip address
Router(config-if)# encapsulation ppp
Router(config-if)# multilink-group 1
Router(config-if)# CNTL/Z
Router#
Enabling PPP Multilink Fragmentation
By default, PPP multilink fragmentation is enabled. To enable PPP multilink fragmentation after it has
been disabled, perform this task in interface configuration mode:
Command
Router(config-if)# [no] ppp multilink
fragmentation
Router(config-if)# [no] multilink fragment-delay
milliseconds
Enabling fragmentation reduces the delay latency among bundle links, but adds some load to the CPU.
Disabling fragmentation may result in better throughput.
If your data traffic is consistently of a similar size, we recommend disabling fragmentation. In this case,
the benefits of fragmentation may be outweighed by the added load on the CPU.
OL-9465-03
Purpose
Selects the interface.
Removes any specified IP address.
Enables PPP encapsulation.
Designates an interface as part of a multilink bundle.
bundle-id is the bundle number created with the interface multilink
bundle-id command.
(Optional) Enables Challenge Handshake Authentication Protocol
(CHAP) authentication.
(Optional) Enables the presence of multiple bundles between two
hosts.
Purpose
Enables fragmentation. By default fragmentation is enabled.
Specifies the tolerable delay in sending the fragment on the
multilink. This delay is used to compute fragment size of the
packet. Three supported fragment sizes are 128, 256, 512. Default
delay is 30ms.
Optical Services Modules Installation and Configuration Note, 12.2SR
Configuring the Interfaces
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