Delta Electronics Sonet OC-48/SDH User Manual download pdf (Page 17)

Chapter 2

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Interfaces

translates into 255.255.255.0. Forgetting to specify the prefix length results in the router assum-

ing a length of 32 bits, or /32. The text description on the interface is enclosed in quotation marks

to allow for the spaces in the text. This convention is consistent throughout the JUNOS software

syntax.

It turns out that we made a mistake in assigning the fxp0 IP address. It should have an

address of 172.16.1.1 /24. Because the inet family supports multiple addresses, simply entering

the new address results in the interface having two IP addresses. We don’t want this to happen,

so let’s first delete the old information and then correct our mistake:

[edit interfaces fxp0]

user@Cabernet# delete unit 0 family inet address 172.16.0.1/24

user@Cabernet# set unit 0 family inet address 172.16.1.1/24

While only a virtual entity, the loopback interface of the router closely simulates the opera-

tion of a broadcast interface. The configuration syntax is similar in nature, so we’ll investigate

it at this point. Both an IP address and a description are assigned:

[edit interfaces lo0]

user@Cabernet# set unit 0 family inet address 192.168.1.1/32

user@Cabernet# set description "This is the router's loopback interface"

One major difference of the loopback interface is the prefix length of the addresses—only a

32-bit prefix length is supported in the JUNOS software.

ATM Interfaces

Let’s continue on and configure the interface to Merlot. All ATM interfaces in the JUNOS soft-

ware require some configuration of physical properties: the maximum number of virtual circuits

allowed on a virtual path and the encapsulation of the interface. We also assign a description

to the interface:

[edit interfaces at-0/2/0]

user@Cabernet# set atm-options vpi 0 maximum-vcs 200

user@Cabernet# set encapsulation atm-pvc

user@Cabernet# set description "Connection to Merlot"

Then, we can configure the logical properties of the interface:

[edit interfaces at-0/2/0]

user@Cabernet# set unit 100 point-to-point

user@Cabernet# set unit 100 family inet address 10.0.1.1/24

user@Cabernet# set unit 100 vci 0.100

SONET Interfaces

SONET interfaces don’t require any physical-level configuration, as did the ATM interface.

We’ll be adding some to our interface, however. A description is in order to provide for easier

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Delta Electronics Sonet OC-48/SDH User Manual Page 17