Quiz Entry - updated: 2026.07.14
What are the key show commands for verifying router interface configuration?
show ip interface brief for a status summary, show running-config interface for the exact config, and show ip route to confirm the connected networks appeared.
| Command | Purpose |
|---|---|
show ip interface brief |
Quick summary of all interfaces — IP (Internet Protocol) address, status, protocol |
show ipv6 interface brief |
Same for IPv6 — shows link-local and global addresses |
show running-config interface [id] |
Exact commands configured on a specific interface |
show ip route |
IPv4 routing table — shows connected (C) and local (L) routes |
show ipv6 route |
IPv6 routing table |
Route table codes (Cisco IOS 15+):
- C (Connected): Directly connected network (e.g., 192.168.10.0/24)
- L (Local): The router's own interface address (e.g., 192.168.10.1/32 for IPv4, /128 for IPv6)
The local host route has an AD (Administrative Distance) of 0 and uses a /32 mask (IPv4) or /128 mask (IPv6). It allows the router to efficiently process packets destined to its own interface.
Tip: show ip interface brief is the single most useful command for a quick health check — it shows all interfaces, their IPs, and up/down status in one view.
Go deeper:
Routing table (Wikipedia) — the table show ip routeprints, including connected (C) and host (/32) entries.