Zyxel ZyWALL-USG50 Router Manual PDF (Setup & Configuration Guide)

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Chapter 14 Routing Protocols

ZyWALL USG 50 User’s Guide

306

14.3.2

OSPF Area Add/Edit Screen

The

OSPF Area Add/Edit

screen allows you to create a new area or edit an

existing one. To access this screen, go to the

OSPF

summary screen (see

Section

14.3 on page 299

), and click either the

Add

icon or an

Edit

icon.

Figure 185

Configuration > Network > Routing > OSPF > Add

The following table describes the labels in this screen.

Table 85

Configuration > Network > Routing > OSPF > Add

LABEL

DESCRIPTION

Area ID

Type the unique, 32-bit identifier for the area in IP address format.

Type

Select the type of OSPF area.

Normal

- This area is a normal area. It has routing information about

the OSPF AS and about networks outside the OSPF AS.

Stub

- This area is an stub area. It has routing information about the

OSPF AS but not about networks outside the OSPF AS. It depends on a

default route to send information outside the OSPF AS.

NSSA

- This area is a Not So Stubby Area (NSSA), per RFC 1587. It has

routing information about the OSPF AS and networks that are outside

the OSPF AS and are directly connected to the NSSA. It does not have

information about other networks outside the OSPF AS.

Authentication

Select the default authentication method used in the area. This

authentication protects the integrity, but not the confidentiality, of

routing updates.

None

uses no authentication.

Text

uses a plain text password that is sent over the network (not very

secure).

MD5

uses an MD5 password and authentication ID (most secure).

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14.3.3

Virtual Link Add/Edit Screen

The

Virtual Link Add/Edit

screen allows you to create a new virtual link or edit

an existing one. When the OSPF add or edit screen (see

Section 14.3.2 on page

Text

Authentication

Key

This field is available if the

Authentication

is

Text

. Type the password

for text authentication. The key can consist of alphanumeric characters

and the underscore, and it can be up to 8 characters long.

MD5

Authentication

ID

This field is available if the

Authentication

is

MD5

. Type the default ID

for MD5 authentication in the area. The ID can be between 1 and 255.

MD5

Authentication

Key

This field is available if the

Authentication

is

MD5

. Type the default

password for MD5 authentication in the area. The password can consist

of alphanumeric characters and the underscore, and it can be up to 16

characters long.

Virtual Link

This section is displayed if the

Type

is

Normal

. Create a virtual link if

you want to connect a different area (that does not have a direct

connection to the backbone) to the backbone. You should set up the

virtual link on the ABR that is connected to the other area and on the

ABR that is connected to the backbone.

Add

Click this to create a new virtual link.

Edit

Double-click an entry or select it and click

Edit

to open a screen where

you can modify the entry’s settings.

Remove

To remove an entry, select it and click

Remove

. The ZyWALL confirms

you want to remove it before doing so.

#

This field is a sequential value, and it is not associated with a specific

area.

Peer Router ID

This is the 32-bit ID (in IP address format) of the other ABR in the

virtual link.

Authentication

This is the authentication method the virtual link uses. This

authentication protects the integrity, but not the confidentiality, of

routing updates.

None

uses no authentication.

Text

uses a plain text password that is sent over the network (not very

secure). Hover your cursor over this label to display the password.

MD5

uses an MD5 password and authentication ID (most secure).

Hover your cursor over this label to display the authentication ID and

key.

Same as Area

has the virtual link also use the

Authentication

settings above.

OK

Click

OK

to save your changes back to the ZyWALL.

Cancel

Click

Cancel

to exit this screen without saving.

Table 85

Configuration > Network > Routing > OSPF > Add (continued)

LABEL

DESCRIPTION

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306

) has the Type set to Normal, a Virtual Link table displays. Click either the

Add

icon or an entry and the

Edit

icon to display a screen like the following.

Figure 186

Configuration > Network > Routing > OSPF > Add > Add

The following table describes the labels in this screen.

14.4

Routing Protocol Technical Reference

Here is more detailed information about RIP and OSPF.

Table 86

Configuration > Network > Routing > OSPF > Add > Add

LABEL

DESCRIPTION

Peer Router ID

Enter the 32-bit ID (in IP address format) of the other ABR in the virtual

link.

Authentication

Select the authentication method the virtual link uses. This

authentication protects the integrity, but not the confidentiality, of

routing updates.

None

uses no authentication.

Text

uses a plain text password that is sent over the network (not very

secure).

MD5

uses an MD5 password and authentication ID (most secure).

Same as Area

has the virtual link also use the

Authentication

settings above.

Text

Authentication

Key

This field is available if the

Authentication

is

Text

. Type the password

for text authentication. The key can consist of alphanumeric characters

and the underscore, and it can be up to 8 characters long.

MD5

Authentication

ID

This field is available if the

Authentication

is

MD5

. Type the default ID

for MD5 authentication in the area. The ID can be between 1 and 255.

MD5

Authentication

Key

This field is available if the

Authentication

is

MD5

. Type the default

password for MD5 authentication in the area. The password can consist

of alphanumeric characters and the underscore, and it can be up to 16

characters long.

OK

Click

OK

to save your changes back to the ZyWALL.

Cancel

Click

Cancel

to exit this screen without saving.

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Authentication Types

Authentication is used to guarantee the integrity, but not the confidentiality, of

routing updates. The transmitting router uses its key to encrypt the original

message into a smaller message, and the smaller message is transmitted with the

original message. The receiving router uses its key to encrypt the received

message and then verifies that it matches the smaller message sent with it. If the

received message is verified, then the receiving router accepts the updated

routing information. The transmitting and receiving routers must have the same

key.

The ZyWALL supports three types of authentication for RIP and OSPF routing

protocols:

•

None

- no authentication is used.

•

Text

– authentication using a plain text password, and the (unencrypted)

password is sent over the network. This method is usually used temporarily to

prevent network problems.

•

MD5

– authentication using an MD5 password and authentication ID.

MD5 is an authentication method that produces a 128-bit checksum, called a

message-digest, for each packet. It also includes an authentication ID, which can

be set to any value between 1 and 255. The ZyWALL only accepts packets if these

conditions are satisfied.

•

The packet’s authentication ID is the same as the authentication ID of the

interface that received it.

•

The packet’s message-digest is the same as the one the ZyWALL calculates

using the MD5 password.

For RIP, authentication is not available in RIP version 1. In RIP version 2, you can

only select one authentication type for all interfaces. For OSPF, the ZyWALL

supports a default authentication type by area. If you want to use this default in

an interface or virtual link, you set the associated

Authentication Type

field to

Same as Area

. As a result, you only have to update the authentication

information for the area to update the authentication type used by these

interfaces and virtual links. Alternatively, you can override the default in any

interface or virtual link by selecting a specific authentication method. Please see

the respective interface sections for more information.

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