ZTE ZXDSL 931VII Netvigator Router Manual PDF (Setup & Configuration Guide)

Page 116 / 198 Scroll up to view Page 111 - 115

ZXDSL 931WII Operation manual

F

IGURE

136 D

EFAULT

G

ATEWAY

N

OTICE

Click

Save/Apply

to save the conﬁguration so that the changes

can take effect.

Static Routes

Background

Networking devices forward packets using route information that

is either manually conﬁgured or dynamically learned using a rout-

ing protocol. Static routes are manually conﬁgured and deﬁne an

explicit path between two networking devices.

Unlike a dynamic

routing protocol, static routes are not automatically updated and

must be manually re-conﬁgured if the network topology changes.

The beneﬁts of using static routes include security and resource

efﬁciency. Static routes use less bandwidth than dynamic routing

protocols and no CPU cycles are used to calculate and communi-

cate routes.

The main disadvantage to using static routes is the

lack of automatic re-conﬁguration if the network topology changes.

Static routes can be redistributed into dynamic routing protocols

but routes generated by dynamic routing protocols cannot be re-

distributed into the static routing table.

No algorithm exists to

prevent the conﬁguration of routing loops that use static routes.

Static routes are useful for smaller networks with only one path to

an outside network and to provide security for a larger network for

certain types of trafﬁc or links to other networks that need more

control. In general, most networks use dynamic routing protocols

to communicate between networking devices but may have one or

two static routes conﬁgured for special cases.

Adding Static

Route

1.

Select

Advanced Setup > Routing > Static Routes

to dis-

play the interface as shown in

F

i

g

u

r

e

1

3

7

.

110

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Chapter 11 Routing Conﬁguration

F

IGURE

137 A

DDING

S

TATIC

R

OUTE

2.

Enter

the

Destination

Nnetwork

Address

and

Subnet

Mask

.

3.

Select the

Use Interface

.

4.

If select

LAN/br0

interface, you need to deﬁne

Use Gateway

IP Address

, as shown in

F

i

g

u

r

e

1

3

8

.

F

IGURE

138 A

DDING

S

TATIC

R

OUTE WITH

LAN B

RIDGE

I

NTERFACE

5.

Click

Save/Apply

to

save

the

conﬁguration

so

that

the

changes can take effect.

Removing Static

Route

Select the

Remove

check box in the table and click

Remove

to

apply the settings.

Policy Routing

1.

Select

Advanced Setup > Routing > Policy Routing

to dis-

play the interface as shown in

F

i

g

u

r

e

1

3

9

.

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ZXDSL 931WII Operation manual

F

IGURE

139 P

OLICY

R

OUTING

O

VERVIEW

2.

Click

Add

in the above interface to enter the interface as shown

in

F

i

g

u

r

e

1

4

0

.

F

IGURE

140 A

DDING

P

OLICY

R

OUTING

3.

T

a

b

l

e

2

is a description of the different options.

T

ABLE

22 P

OLICY

R

OUTING

C

ONFIGURATION

O

PTIONS

Term

Description

Policy Name

Deﬁne policy name.

Physical LAN Port

Deﬁne physical LAN port.

Source IP

Deﬁne source IP address.

Use Interface

Select the WAN interface. If se-

lect IPoE as WAN interface, de-

fault gateway must be conﬁg-

ured, and if selected WAN inter-

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Chapter 11 Routing Conﬁguration

Term

Description

face is in vlanMux mode, VLAN

trunk must be set.

Default Gateway

Deﬁne default gateway IP add-

erss.

4.

Click

Save/Apply

to

save

the

conﬁguration

so

that

the

changes can take effect.

RIP

Background

The Routing Information Protocol (RIP) is one of the most endur-

ing of all routing protocols.

RIP is also one of the more easily

confused protocols because a variety of RIP-like routing protocols

proliferated, some of which even used the same name!

RIP and

the myriad RIP-like protocols were based on the same set of algo-

rithms that use distance vectors to mathematically compare routes

to identify the best path to any given destination address. These

algorithms emerged from academic research that dates back to

1957.

The open standard version of RIP today, sometimes referred to as

IP RIP, is formally deﬁned in two documents: Request For Com-

ments (RFC) 1058 and Internet Standard (STD) 56. As IP-based

networks became more and larger in scale, it became apparent

to the Internet Engineering Task Force (IETF) that RIP needed to

be updated.

Consequently, the IETF released RFC 1388 in Jan-

uary 1993, which then superseded RFC 1723, which described RIP

2 (the second version of RIP) in November 1994.

These RFCs

described an extension of RIP capabilities but did not attempt to

abandon the previous versions of RIP. RIP 2 enabled RIP messages

to carry more information, which permitted the use of a simple

authentication mechanism to secure table updates.

More impor-

tantly, RIP 2 supported subnet masks, a critical feature that was

not available in RIP.

This section summarizes the basic capabilities and features as-

sociated with RIP. Topics include the routing update process, RIP

routing metrics, routing stability, and routing timers.

Routing Updates

RIP sends routing-update messages at regular intervals and when

the network topology changes. When a router receives a routing

update that includes changes to an entry, it updates its routing

table to reﬂect the new route.

The metric value for the path is

increased by 1, and the sender is indicated as the next hop. RIP

routers maintain only the best route (the route with the lowest

metric value) to a destination.

After updating its routing table,

the 931WII immediately begins transmitting routing updates to

inform other network routers of the change.

These updates are

sent independently of the regularly scheduled updates that RIP

routers send.

RIP Routing Metric

RIP uses a single routing metric (hop count) to measure the dis-

tance between the source and a destination network. Each hop in

a path from source to destination is assigned a hop count value,

which is typically 1. When a router receives a routing update that

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ZXDSL 931WII Operation manual

contains a new or changed destination network entry, the 931WII

adds 1 to the metric value indicated in the update and enters the

network in the routing table. The IP address of the sender is used

as the next hop.

RIP Conﬁguration

1.

Select

Advanced Setup > Routing > RIP

to display the in-

terface as shown in

F

i

g

u

r

e

1

4

1

.

F

IGURE

141 RIP C

ONFIGURATION

2.

Select the desired RIP

Version

and

Operation

.

3.

Select the

Enabled

check-box.

4.

Click

Save/Apply

to

save

the

conﬁguration

so

that

the

changes can take effect.

114

Conﬁdential and Proprietary Information of ZTE CORPORATION

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