Cisco 7604 Configuration Manual page 498

Configuring IPv6 Address Compression
Table 34-1 Compressible Address Types and Methods
Address Type
EUI-64 based on MAC address
Embedded IPv4 address
Link Local
Others
To turn on the compression of IPv6 addresses, enter the mls ipv6 acl compress address unicast
command. To turn off the compression of IPv6 addresses, enter the no form of this command.
This example shows how to turn on address compression for IPv6 addresses:
Router(config)# mls ipv6 acl compress address unicast
Router(config)#
This example shows how to turn off address compression for IPv6 addresses:
Router(config)# no mls ipv6 acl compress address unicast
Router(config)#
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
34-4
Chapter 34
Compression Method
This address is compressed by removing 16 bits from bit
locations [39:24]. No information is lost when the hardware
compresses these addresses.
This address is compressed by removing the upper 16 bits. No
information is lost when the hardware compresses these
addresses.
These addresses are compressed by removing the zeros in bits
[95:80] and are identified using the same packet type as the
embedded IPv4 address. No information is lost when the
hardware compresses these addresses.
If the IPv6 address does not fall into any of the above
categories, it is classified as other. If the IPv6 address is
classified as other, the following occurs:
• If the compress mode is on, the IPv6 address is compressed
similarly to the EUI-64 compression method (removal of
bits [39:24]) to allow for the Layer 4 port information to be
used as part of the key used to look up the QoS TCAM, but
Layer 3 information is lost.
If the global compression mode is off, the entire 128 bits of
•
the IPv6 address are used. The Layer 4 port information
cannot be included in the key to look up the QoS TCAM
because of the size constraints on the IPv6 lookup key.
Understanding Cisco IOS ACL Support
OL-4266-08