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Optical Services Modules Installation and Configuration Note, 12.2SR
OL-9465-03
Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules
Configuring the Interfaces
Assigning an Interface to a Multilink Bundle
To assign an interface to a multilink bundle, use the following commands in interface configuration
mode:
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:
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.
Command
Purpose
Step 1
Router(config)#
interface serial
slot/port/DS0 number: channel-group number
Selects the interface.
Step 2
Router(config-if)#
no ip address
Removes any specified IP address.
Step 3
Router(config-if)#
encapsulation ppp
Enables PPP encapsulation.
Step 4
Router(config-if)#
multilink-group
bundle-id
Designates an interface as part of a multilink bundle.
bundle-id
is the bundle number created with the
interface multilink
bundle-id
command.
Step 5
Router(config-if)#
ppp authentication chap
(Optional) Enables Challenge Handshake Authentication Protocol
(CHAP) authentication.
Step 6
Router(config-if)#
ppp chap hostname
name
(Optional) Enables the presence of multiple bundles between two
hosts.
Command
Purpose
Router(config-if)# [no]
ppp multilink
fragmentation
Enables fragmentation. By default fragmentation is enabled.
Router(config-if)# [
no
]
multilink fragment-delay
milliseconds
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.