Dell MX9116n EMC SmartFabric OS10 User Guide - Page 592

IPv6 addresses

Page 592 highlights

Ethernet 1/1/20 up Management 1/1/1 up Vlan 1 up / up / up / up fe80::eef4:bbff:fefb:fa30/64 2020::1/64 fe80::eef4:bbff:fefb:f9ef/64 fe80::eef4:bbff:fefb:fa59/64 Enabled Enabled Enabled IPv6 addresses An IPv6 address consists of a 48-bit global routing prefix, optional 16-bit subnet ID, and a 64-bit interface identifier in the extended universal identifier (EUI)-64 format. IPv6 128-bit addresses are represented as a series of eight 16-bit hexadecimal fields separated by colons: x:x:x:x:x:x:x:x. 2001:0db8:0000:0000:0000:0000:1428:57a Leading zeros in each field are optional. You can also use two colons (::) to represent successive hexadecimal fields of zeros, but you can use this short version only one time in each address: 2001:db8::1428:57ab In the following example, all the addresses are valid and equivalent: • 2001:0db8:0000:0000:0000:0000:1428:57ab • 2001:0db8:0000:0000:0000::1428:57ab • 2001:0db8:0:0:0:0:1428:57ab • 2001:0db8:0:0::1428:57ab • 2001:0db8::1428:57ab • 2001:db8::1428:57ab Write IPv6 networks using CIDR notation. An IPv6 network or subnet is a contiguous group of IPv6 addresses which must be a power of two. The initial bits of addresses, which are identical for all hosts in the network, are the network's prefix. A network is denoted by the first address in the network and the size in bits of the prefix in decimal, separated with a slash. Because a single host is seen as a network with a 128-bit prefix, host addresses may be written with a following /128. For example, 2001:0db8:1234::/48 stands for the network with addresses 2001:0db8:1234:0000:0000:0000:0000:0000 through 2001:0db8:1234:ffff:ffff:ffff:ffff:ffff. As soon as you assign an IPv6 address, IPv6 packet processing is enabled on an interface. You can manually disable and re-enable IPv6 processing on an interface configured with an IPv6 address using the no ipv6 enable and ipv6 enable commands. To remove all IPv6 addresses from an interface, use the no ipv6 address command. To remove a specific IPv6 address, use the ipv6 address ipv6-address/mask command. Link-local addresses When an OS10 switch boots up, an IPv6 unicast link-local address automatically assigns to an interface using stateless configuration. A link-local address allows IPv6 devices on a local link to communicate without requiring a globally unique address. IPv6 reserves the address block FE80::/10 for link-local unicast addressing. Global addresses To enable stateless autoconfiguration of an IPv6 global address and set the interface to Host mode, use the ipv6 address autoconfig command. The router receives network prefixes in IPv6 router advertisements (RAs). An interface ID appends to the prefix. In Host mode, IPv6 forwarding is disabled. The no ipv6 address autoconfig command disables IPv6 global address autoconfiguration, and sets the interface to Router mode with IPv6 forwarding enabled. DHCP-assigned addresses As an alternative to stateless autoconfiguration, you can enable a network host to obtain IPv6 addresses using a DHCP server via stateful autoconfiguration using the ipv6 address dhcp command. A DHCPv6 server uses a prefix pool to configure a network address on an interface. The interface ID automatically generates. NOTE: On the management interfaces or management VLANs, when the IP address is acquired using DHCPv6, the IPv6 address with a /128 prefix-mask is assigned to the interface. However, to preserve backward compatibility and allow reachability, a static route with a /64 prefix-mask is also made available. Manally configured addresses 592 Layer 3

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  • 1,265
  • 1,266
  • 1,267
  • 1,268
  • 1,269
  • 1,270
  • 1,271
  • 1,272
  • 1,273
  • 1,274
  • 1,275
  • 1,276
  • 1,277
  • 1,278
  • 1,279
  • 1,280
  • 1,281
  • 1,282
  • 1,283
  • 1,284
  • 1,285
  • 1,286
  • 1,287
  • 1,288
  • 1,289
  • 1,290
  • 1,291
  • 1,292
  • 1,293
  • 1,294
  • 1,295
  • 1,296
  • 1,297
  • 1,298
  • 1,299
  • 1,300
  • 1,301
  • 1,302
  • 1,303
  • 1,304
  • 1,305
  • 1,306
  • 1,307
  • 1,308
  • 1,309
  • 1,310
  • 1,311
  • 1,312
  • 1,313
  • 1,314
  • 1,315
  • 1,316
  • 1,317
  • 1,318
  • 1,319
  • 1,320
  • 1,321
  • 1,322
  • 1,323
  • 1,324
  • 1,325
  • 1,326
  • 1,327
  • 1,328
  • 1,329
  • 1,330
  • 1,331
  • 1,332
  • 1,333
  • 1,334
  • 1,335
  • 1,336
  • 1,337
  • 1,338
  • 1,339
  • 1,340

Ethernet 1/1/20
up
/ up
fe80::eef4:bbff:fefb:fa30/64
2020::1/64
Enabled
Management 1/1/1
up
/ up
fe80::eef4:bbff:fefb:f9ef/64
Enabled
Vlan 1
up
/ up
fe80::eef4:bbff:fefb:fa59/64
Enabled
IPv6 addresses
An IPv6 address consists of a 48-bit global routing prefix, optional 16-bit subnet ID, and a 64-bit interface identifier in the extended
universal identifier (EUI)-64 format.
IPv6 128-bit addresses are represented as a series of eight 16-bit hexadecimal fields separated by colons: x:x:x:x:x:x:x:x.
2001:0db8:0000:0000:0000:0000:1428:57a
Leading zeros in each field are optional. You can also use two colons (::) to represent successive hexadecimal fields of zeros, but you can
use this short version only one time in each address:
2001:db8::1428:57ab
In the following example, all the addresses are valid and equivalent:
2001:0db8:0000:0000:0000:0000:1428:57ab
2001:0db8:0000:0000:0000::1428:57ab
2001:0db8:0:0:0:0:1428:57ab
2001:0db8:0:0::1428:57ab
2001:0db8::1428:57ab
2001:db8::1428:57ab
Write IPv6 networks using CIDR notation. An IPv6 network or subnet is a contiguous group of IPv6 addresses which must be a power of
two. The initial bits of addresses, which are identical for all hosts in the network, are the network's prefix.
A network is denoted by the first address in the network and the size in bits of the prefix in decimal, separated with a slash. Because a
single host is seen as a network with a 128-bit prefix, host addresses may be written with a following /128.
For example,
2001:0db8:1234::/48
stands for the network with addresses
2001:0db8:1234:0000:0000:0000:0000:0000
through
2001:0db8:1234:ffff:ffff:ffff:ffff:ffff
.
As soon as you assign an IPv6 address, IPv6 packet processing is enabled on an interface. You can manually disable and re-enable IPv6
processing on an interface configured with an IPv6 address using the
no ipv6 enable
and
ipv6 enable
commands.
To remove all IPv6 addresses from an interface, use the
no ipv6 address
command. To remove a specific IPv6 address, use the
ipv6 address
ipv6-address/mask
command.
Link-local addresses
When an OS10 switch boots up, an IPv6 unicast link-local address automatically assigns to an interface using stateless configuration. A
link-local address allows IPv6 devices on a local link to communicate without requiring a globally unique address. IPv6 reserves the address
block FE80::/10 for link-local unicast addressing.
Global addresses
To enable stateless autoconfiguration of an IPv6 global address and set the interface to Host mode, use the
ipv6 address
autoconfig
command. The router receives network prefixes in IPv6 router advertisements (RAs). An interface ID appends to the prefix.
In Host mode, IPv6 forwarding is disabled.
The
no ipv6 address autoconfig
command disables IPv6 global address autoconfiguration, and sets the interface to Router mode
with IPv6 forwarding enabled.
DHCP-assigned addresses
As an alternative to stateless autoconfiguration, you can enable a network host to obtain IPv6 addresses using a DHCP server via stateful
autoconfiguration using the
ipv6 address dhcp
command. A DHCPv6 server uses a prefix pool to configure a network address on an
interface. The interface ID automatically generates.
NOTE:
On the management interfaces or management VLANs, when the IP address is acquired using DHCPv6, the IPv6
address with a /128 prefix-mask is assigned to the interface. However, to preserve backward compatibility and allow
reachability, a static route with a /64 prefix-mask is also made available.
Manally configured addresses
592
Layer 3