1-4

User

Guide

for

the

Cisco

Application

Networking

Manager

5.2

OL-26572-01

Chapter

1

Overview

IPv6

Considerations

•

A

unique-local

address

is

an

optional

IPv6

unicast

address

that

is

used

for

local

communication

within

an

organization

and

it

is

si

milar

to

a

private

IPv4

address

(f

or

example,

10.10.2.1).

unique-local

addresses

have

a

global

scope,

but

they

are

not

routable

on

the

Internet,

and

they

are

assigned

by

a

central

authority.

All

unique-local

addresses

have

a

predefined

prefix

of

FC00::/7.

You

can

configure

only

one

IPv6

unique-local

address

on

an

interface.

In

a

redundant

configuration,

you

can

configure

an

IPv6

peer

unique-local

address

on

the

active

that

is

synchronized

to

the

standby

ACE.

You

can

configure

only

one

peer

unique-local

IPv6

address

on

an

interface.

•

A

global

address

is

an

IPv6

unicast

address

that

is

used

for

general

IPv6

communication.

Each

global

address

is

unique

across

the

entire

Internet.

Therefore,

its

scope

is

global.

The

low

order

64

bits

can

be

assigned

in

several

ways,

including

autoconfiguration

using

the

EUI-64

format.

You

can

configure

onl

y

one

gl

obally

uni

que

IPv6

address

on

an

i

nterface.

In

a

redundant

configuration,

you

can

configure

an

IPv6

peer

global

address

that

is

synchronized

to

the

standby

ACE.

When

you

configure

redundancy

with

active

and

st

andby

ACEs,

you

can

configure

a

VLAN

interface

that

has

an

alias

global

IPv6

address

that

is

shared

between

the

active

and

standby

ACEs.

The

al

ias

IPv6

address

ser

ves

as

a

shared

gateway

for

the

two

ACEs

i

n

a

re

dundant

configuration.

You

can

configure

only

one

alias

global

IPv6

address

on

an

interface.

•

A

multicast

address

is

used

for

communications

from

one

source

to

many

destinations.

IPv6

multicast

addresses

function

in

a

manner

that

is

similar

to

IPv4

multicast

addresses.

All

multicast

addresses

have

a

predefined

prefix

of

FF00::/8.

•

The

ACE

supports

abbreviated

IPv6

addresses.

When

using

double

colons

(::)

for

leading

zeros

in

a

contiguous

block,

they

can

only

be

used

once

in

an

address.

Leading

zeros

can

be

omitted.

Trailing

zeros

cannot

be

omitted.

The

DM

will

abbreviate

an

IPv6

address

after

you

finish

typing

it.

If

you

enter

the

entire

address

with

a

block

of

contiguous

zeros,

the

DM

collapses

it

into

the

double

colons.

For

example:

FF01:0000:0000:0000:0000:0000:0000:101

becomes

FF01::101.

•

The

ACE

uses

the

Neighbor

Discovery

(ND)

protocol

to

manage

and

learn

the

mapping

of

IPv6

to

Media

Access

Control

(MAC)

addresses

of

nodes

attached

to

the

local

link.

The

ACE

uses

this

information

to

forward

and

transmit

IPv6

packets.

The

neighbor

discovery

protocol

enables

IPv6

nodes

and

routers

to:

–

Determine

the

link-layer

address

of

a

neighbor

on

the

same

link

–

Find

neighboring

routers

–

Keep

track

of

neighbors

The

IPv6

neighbor

discovery

process

uses

ICMPv6

messages

and

solicited-node

multicast

addresses

to

determine

the

link-layer

address

of

a

neighbor

on

the

same

network

(local

link),

verify

the

reachability

of

a

neighbor,

and

keep

track

of

neighbor

routers.

The

IPv6

neighbor

discovery

process

uses

the

fol

lowing

mechanisms

for

its

operation:

–

Neighbor

Solicitation

–

Neighbor

Advertisement

–

Router

Solicitation

–

Router

Advertisement

–

Duplicate

Address

Detection

•

The

ACE

supports

IPv6-to-IPv6

L4/L7

SLB,

i

ncluding

support

for

IPv6

VIP,

predictor,

probe,

serverfarm,

sticky,

access-list,

object-group,

interface,

source

NAT,

OCSP,

and

CRL.