Quiz Entry - updated: 2026.07.14
How do you read the output of show ipv6 interface brief, and how does its format differ from the IPv4 version?
It lists each interface's combined status in brackets as [status/protocol] (e.g. [up/up], [administratively down/down]) followed by the interface's IPv6 addresses on indented lines — there are no separate columns like the IPv4 output.
show ipv6 interface brief Output:
R1# show ipv6 interface brief
GigabitEthernet0/0/0 [up/up]
FE80::201:C9FF:FE89:4501
2001:DB8:ACAD:10::1
GigabitEthernet0/0/1 [up/up]
FE80::201:C9FF:FE89:4502
2001:DB8:FEED:224::1
Vlan1 [administratively down/down]
unassigned
How to read it:
| Element | Meaning |
|---|---|
[up/up] |
[Status/Protocol] — Layer 1 / Layer 2 state, same meaning as the IPv4 columns |
[administratively down/down] |
Interface was disabled with shutdown |
FE80::... |
The interface's link-local address (auto-generated) |
2001:DB8:... |
The configured global unicast address |
unassigned |
No IPv6 address configured |
Difference from IPv4: show ip interface brief uses one row with separate Status and Protocol columns, while show ipv6 interface brief combines them into a [up/up] bracket and lists each interface's IPv6 addresses below.
Go deeper:
IPv6 — link-local and global addresses (Wikipedia) — why each interface lists both an FE80::link-local and a global address.