CLI Reference Guide-R04

Chapter 31 | IP Interface Commands
IPv6 Interface
– 917 –
This example displays a brief summary of IPv6 addresses configured on the switch.
Console#show ipv6 interface brief
Interface VLAN IPv6 IPv6 Address
--------------- ---------- ---------- ------------------------------------
VLAN 1 Up Up 2001:db8:0:1:2e0:cff:fe02:fd/64
VLAN 1 Up Up 2001:db8:2222:7272::72/96
Table 179: show ipv6 interface - display description
Field Description
VLAN A VLAN is marked “up” if the switch can send and receive packets on this interface,
“down” if a line signal is not present, or “administratively down” if the interface has
been disabled by the administrator.
IPv6 IPv6 is marked “enable” if the switch can send and receive IP traffic on this
interface, “disable” if the switch cannot send and receive IP traffic on this interface,
or “stalled” if a duplicate link-local address is detected on the interface.
Link-local
address
Shows the link-local address assigned to this interface
Global unicast
address(es)
Shows the global unicast address(es) assigned to this interface
Joined group
address(es)
In addition to the unicast addresses assigned to an interface, a node is required to
join the all-nodes multicast addresses FF01::1 and FF02::1 for all IPv6 nodes within
scope 1 (interface-local) and scope 2 (link-local), respectively.
FF01::1/16 is the transient interface-local multicast address for all attached IPv6
nodes, and FF02::1/16 is the link-local multicast address for all attached IPv6
nodes. The interface-local multicast address is only used for loopback
transmission of multicast traffic. Link-local multicast addresses cover the same
types as used by link-local unicast addresses, including all nodes (FF02::1), all
routers (FF02::2), and solicited nodes (FF02::1:FFXX:XXXX) as described below.
A node is also required to compute and join the associated solicited-node
multicast addresses for every unicast and anycast address it is assigned. IPv6
addresses that differ only in the high-order bits, e.g. due to multiple high-order
prefixes associated with different aggregations, will map to the same solicited-
node address, thereby reducing the number of multicast addresses a node must
join. In this example, FF02::1:FF90:0/104 is the solicited-node multicast address
which is formed by taking the low-order 24 bits of the address and appending
those bits to the prefix.
MTU Maximum transmission unit for this interface.
ND DAD Indicates whether (neighbor discovery) duplicate address detection is enabled.
number of DAD
attempts
The number of consecutive neighbor solicitation messages sent on the interface
during duplicate address detection.
ND retransmit
interval
The interval between IPv6 neighbor solicitation retransmissions sent on an
interface during duplicate address detection.
ND advertised
retransmit
interval
The retransmit interval is included in all router advertisements sent out of an
interface so that nodes on the same link use the same time value.
ND reachable
time
The amount of time a remote IPv6 node is considered reachable after a
reachability confirmation event has occurred
ND advertised
reachable time
The reachable time is included in all router advertisements sent out of an
interface so that nodes on the same link use the same time value.
ND advertised
router lifetime
Tells the neighbor receiving this message how long this router should be used as
a default router.