• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1021
  • Last Modified:

Why does fa0 and fa1 not show up in show interface status

Fa0 and Fa1 do not show in "sh interface status" but do in "sh ip interface brief"?

1811#sh interface status

Port    Name               Status       Vlan       Duplex Speed Type
Fa2                        notconnect   1            auto    auto 10/100BaseTX
Fa3                        notconnect   1            auto    auto 10/100BaseTX
Fa4                        notconnect   1            auto    auto 10/100BaseTX
Fa5                        notconnect   1            auto    auto 10/100BaseTX
Fa6                        notconnect   1            auto    auto 10/100BaseTX
Fa7                        notconnect   1            auto    auto 10/100BaseTX
Fa8                        notconnect   1            auto    auto 10/100BaseTX
Fa9                        notconnect   1            auto    auto 10/100BaseTX

1811#sh ip interface br
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0            YES NVRAM  up                    up
FastEthernet1              unassigned      YES NVRAM  administratively down down
FastEthernet2              unassigned      YES unset  up                    down
FastEthernet3              unassigned      YES unset  up                    down
FastEthernet4              unassigned      YES unset  up                    down
FastEthernet5              unassigned      YES unset  up                    down
FastEthernet6              unassigned      YES unset  up                    down
FastEthernet7              unassigned      YES unset  up                    down
FastEthernet8              unassigned      YES unset  up                    down
FastEthernet9              unassigned      YES unset  up                    down
Vlan1                      unassigned      YES NVRAM  up                    down
Async1                     unassigned      YES NVRAM  down                  down
  • 3
  • 2
2 Solutions
Dragon0x40Author Commented:
interface FastEthernet0
 description $ETH-WAN$
 ip address
 duplex auto
 speed auto
interface FastEthernet1
 no ip address
 duplex auto
 speed auto
interface FastEthernet2
interface FastEthernet3
interface FastEthernet4
Don JohnstonInstructorCommented:
It would help to know what platform...

But I'll take a wild guess and say that this is a router with a switch module installed. "show int status" is a switch command and only the interfaces on the switch module are showing with that command.
Looks like because the first two ports are being treated as routed ports, so they won't show up with "sh int status".
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Don JohnstonInstructorCommented:
Actually, routed ports show up with a "show int status" on a multilayer switch. On the VLAN column, L3 ports show as "routed".

But on a router with switch module, only the switch module ports show up with a "show int status".
Dragon0x40Author Commented:
thanks donjohnston and Soulja,

It is an 1811 router.

I guess that Fa0 and Fa1 are strictly layer 3 ports and Fa2 - 9 are strictly layer 2 ports.

1811(config)#int fa1
1811(config-if)#switchport ?
% Unrecognized command

1811(config-if)#no switchport ?
  access     Set access mode characteristics of the interface
  mode       Set trunking mode of the interface
  priority   Set 802.1p priorities
  protected  Configure an interface to be a protected port
  trunk      Set trunking characteristics of the interface
  voice      Voice appliance attributes
Don JohnstonInstructorCommented:
You are correct. The switch module ports are layer 2 only.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Cloud Class® Course: CompTIA Cloud+

The CompTIA Cloud+ Basic training course will teach you about cloud concepts and models, data storage, networking, and network infrastructure.

  • 3
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now