Ways to identify a trunk port?

t800t800 Member Posts: 7 ■□□□□□□□□□
in CCNA & CCENT
Hi All,

Besides 'show running-config', what other ways are they to identify a trunk port?

The running-config will allow you to see something like this:

!
Interface FastEthernet 0/23
switchport mode trunk
!

Is this the only way?

Thanks,
T800
· Share on FacebookShare on Twitter

Comments

  • NetstudentNetstudent Member Posts: 1,693 ■■■□□□□□□□
    you could try show int trunk or show int fa0/1 trunk. ALso show int fa0/1 switchport should give you some trunking info. T
    There is no place like 127.0.0.1 BUT 209.62.5.3 is my 127.0.0.1 away from 127.0.0.1!
    · Share on FacebookShare on Twitter
  • mikej412mikej412 Member Posts: 10,086 ■■■■■■■■■■
    show interface trunk 
    S3750-1#show interface trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa1/0/13    desirable    n-isl          trunking      1
Fa1/0/14    desirable    n-isl          trunking      1
Fa1/0/15    desirable    n-isl          trunking      1

Port        Vlans allowed on trunk
Fa1/0/13    1-4094
Fa1/0/14    1-4094
Fa1/0/15    1-4094

Port        Vlans allowed and active in management domain
Fa1/0/13    1,104-105,199,999
Fa1/0/14    1,104-105,199,999
Fa1/0/15    1,104-105,199,999

Port        Vlans in spanning tree forwarding state and not pruned
Fa1/0/13    1,104
Fa1/0/14    1
Fa1/0/15    1

    S3750-1#show interface Fa1/0/13 trunk 

Port        Mode         Encapsulation  Status        Native vlan
Fa1/0/13    desirable    n-isl          trunking      1

Port        Vlans allowed on trunk
Fa1/0/13    1-4094

Port        Vlans allowed and active in management domain
Fa1/0/13    1,104-105,199,999

Port        Vlans in spanning tree forwarding state and not pruned
Fa1/0/13    1,104
S3750-1#

    S3750-1#show interface Fa1/0/13 switchport
Name: Fa1/0/13
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: trunk
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: isl
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none 
Administrative private-vlan mapping: none 
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
          
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
S3750-1#
    :mike: Cisco Certifications -- Collect the Entire Set!
    · Share on FacebookShare on Twitter
  • t800t800 Member Posts: 7 ■□□□□□□□□□
    Thank you! :)

    T800
    · Share on FacebookShare on Twitter
  • mwgoodmwgood Member Posts: 293
    sh int status | in trunk
    · Share on FacebookShare on Twitter
  • mikej412mikej412 Member Posts: 10,086 ■■■■■■■■■■
    mwgood wrote:
    sh int status | in trunk
    Good one :D
    S3750-1#show interfaces status | include trunk
Fa1/0/13                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/14                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/15                     connected    trunk      a-full  a-100 10/100BaseTX
    I'm sure there are even a few people working on CCNP exams will smack their forehead with the palm of their hand wondering why they didn't figure this one out sooner icon_lol.gif

    I'll post a sample with the CLI help for the output modifier and the show int status with and without the modifier.
    S3750-1#show interfaces status ?
  err-disabled  Show interface error disabled state
  inactive      Show interface inactive state
  module        Limit display to interfaces on module
  |             Output modifiers
  <cr>

S3750-1#show interfaces status | ?
  append    Append redirected output to URL (URLs supporting append operation
            only)
  begin     Begin with the line that matches
  exclude   Exclude lines that match
  include   Include lines that match
  redirect  Redirect output to URL
  tee       Copy output to URL

S3750-1#show interfaces status | include trunk
Fa1/0/13                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/14                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/15                     connected    trunk      a-full  a-100 10/100BaseTX
S3750-1#show interface status

Port      Name               Status       Vlan       Duplex  Speed Type
Fa1/0/1                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/2                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/3                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/4                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/5                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/6                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/7                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/8                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/9                      notconnect   104          auto   auto 10/100BaseTX
Fa1/0/10                     notconnect   104          auto   auto 10/100BaseTX
Fa1/0/11                     notconnect   104          auto   auto 10/100BaseTX
Fa1/0/12                     notconnect   104          auto   auto 10/100BaseTX
Fa1/0/13                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/14                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/15                     connected    trunk      a-full  a-100 10/100BaseTX
Fa1/0/16                     connected    1          a-full  a-100 10/100BaseTX
Fa1/0/17                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/18                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/19                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/20                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/21                     notconnect   1            auto   auto 10/100BaseTX
Fa1/0/22                     connected    1          a-full  a-100 10/100BaseTX
Fa1/0/23                     connected    1          a-full  a-100 10/100BaseTX
Fa1/0/24                     notconnect   1            auto   auto 10/100BaseTX
Gi1/0/1                      notconnect   1            auto   auto Not Present
Gi1/0/2                      notconnect   1            auto   auto Not Present
S3750-1#
    :mike: Cisco Certifications -- Collect the Entire Set!
    · Share on FacebookShare on Twitter
  • t800t800 Member Posts: 7 ■□□□□□□□□□
    mwgood wrote:
    sh int status | in trunk

    Never seen that command before. Very clever!

    T800
    · Share on FacebookShare on Twitter
  • bohra_ajaybohra_ajay Member Posts: 21 ■□□□□□□□□□
    Thankx for the command thats really very smart.
    · Share on FacebookShare on Twitter
  • dtlokeedtlokee Member Posts: 2,378 ■■■■□□□□□□
    mwgood wrote:
    sh int status | in trunk

    Good command to know but it won't work on the sims in the CCNA exam, none of the pipes (|) commands work.
    The only easy day was yesterday!
    · Share on FacebookShare on Twitter
  • bighornsheepbighornsheep Member Posts: 1,506
    Slightly off topic....but could you have more than one trunk between 2 switch? Or are your trunks configured to different switches?
    Jack of all trades, master of none
    · Share on FacebookShare on Twitter
  • networker050184networker050184 Mod Posts: 11,962 Mod
    You can make as many trunks as you want but spanning tree will block the redundant paths. You can build an etherchannel to effectivley use all the bandwidth of the redundant links.
    An expert is a man who has made all the mistakes which can be made.
    · Share on FacebookShare on Twitter
  • mgmguy1mgmguy1 Member Posts: 485 ■■■■□□□□□□
    Bump. I was making some notes on different show commands when I came upon this thread. It might be good to look at and make some notes for yourself.
    "A lot of fellows nowadays have a B.A., M.D., or Ph.D. Unfortunately, they don't have a J.O.B."

    Fats Domino
    · Share on FacebookShare on Twitter
  • webspiderwebspider Member Posts: 30 ■■□□□□□□□□
    Hi
    The "show interfaces status" command will display the status of all the ports in a switch
    · Share on FacebookShare on Twitter
Sign In or Register to comment.