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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance

OL-26645-02

Chapter 1 Overview

IPv6 Considerations

When you configure redundancy with active and standby ACEs, you can configure a VLAN

interface that has an alias global IPv6 address that is shared between the active and standby ACEs.

The alias IPv6 address serves as a shared gateway for the two ACEs in a redundant 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:

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Determine the link-layer address of a neighbor on the same link

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Find neighboring routers

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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 following mechanisms for its operation:

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Neighbor Solicitation

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Neighbor Advertisement

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Router Solicitation

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Router Advertisement

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Duplicate Address Detection

• The ACE supports IPv6-to-IPv6 L4/L7 SLB, including support for IPv6 VIP, predictor, probe,

server farm, sticky, access-list, object-group, interface, source NAT, OCSP, and CRL.

• The probe must have the same IP address type (IPv6 or IPv4) as the real server. For example, you

cannot configure an IPv6 probe to an IPv4 real server.

• You can associate both IPv6 and IPv4 probes to a server farm.

• Only the following Layer 7 protocol will support IPv6:

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Layer 7 HTTP/HTTPS/DNS

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Layer 4 TCP/UDP

• The ACE supports the following:

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IPv6-to-IPv4 SLB and IPv4-to-IPv6 SLB for L7 HTTP/HTTP/TCP/UDP

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Source NAT support of IPv6

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IPv6 access-list and object group

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DHCPv6 relay

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