Catalyst 3750 Changing port from trunk to access

[blait]

Hi.  On my 3750, I had a port that was configured as a trunk.  I changed the configuration of the port to this:

interface GigabitEthernet1/0/22
switchport access vlan 172
switchport mode access
switchport voice vlan 100
switchport port-security maximum 3
mls qos trust cos
spanning-tree portfast
end

Now, when I do a sh vlan, port G1/0/22 does not appear in any vlan, and the phone connected to the port cannot contact the DHCP server in vlan 172.

Switch1#sh vlan

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/37, Gi1/0/39, Gi1/0/40, Gi2/0/1, Gi2/0/3, Gi2/0/4
Gi2/0/5, Gi2/0/11, Gi2/0/13, Gi2/0/16, Gi2/0/17, Gi2/0/18
Gi2/0/23, Gi2/0/25, Gi2/0/29, Gi2/0/41, Gi3/0/3, Gi3/0/4
Gi3/0/5, Gi3/0/10, Gi3/0/15, Gi3/0/29, Gi3/0/35, Gi3/0/38
Gi3/0/40, Gi3/0/41, Gi3/0/47, Gi3/0/49, Gi3/0/50, Gi3/0/51
Gi3/0/52
10 PIX-Outside active
20 VLAN0020 active Gi2/0/22, Gi3/0/43, Gi3/0/48
99 VLAN0099 active
100 VLAN0100 active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7
Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13
Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19
Gi1/0/20, Gi1/0/21, Gi1/0/23, Gi1/0/24, Gi1/0/26, Gi1/0/27
Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33
Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45
Gi1/0/46, Gi1/0/47, Gi1/0/48, Gi2/0/2, Gi2/0/7, Gi2/0/8
Gi2/0/9, Gi2/0/10, Gi2/0/12, Gi2/0/14, Gi2/0/15, Gi2/0/20
Gi2/0/21, Gi2/0/23, Gi2/0/24, Gi2/0/26, Gi2/0/27, Gi2/0/28
Gi2/0/30, Gi2/0/31, Gi2/0/32, Gi2/0/33, Gi2/0/34, Gi2/0/35
Gi2/0/36, Gi2/0/37, Gi2/0/38, Gi2/0/39, Gi2/0/40, Gi2/0/42
Gi2/0/43, Gi2/0/44, Gi2/0/45, Gi2/0/46, Gi2/0/47, Gi2/0/48
Gi3/0/5, Gi3/0/6, Gi3/0/8, Gi3/0/9, Gi3/0/11, Gi3/0/12
Gi3/0/13, Gi3/0/16, Gi3/0/17, Gi3/0/18, Gi3/0/19, Gi3/0/20
Gi3/0/21, Gi3/0/22, Gi3/0/23, Gi3/0/24, Gi3/0/25, Gi3/0/26
Gi3/0/27, Gi3/0/28, Gi3/0/29, Gi3/0/30, Gi3/0/31, Gi3/0/32
Gi3/0/33, Gi3/0/34, Gi3/0/36, Gi3/0/37, Gi3/0/38, Gi3/0/39
Gi3/0/42, Gi3/0/44, Gi3/0/45, Gi3/0/46
102 VLAN0102 active
110 VLAN0110 active
172 VLAN0172 active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7
Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13
Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19
Gi1/0/20, Gi1/0/21, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26
Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/32, Gi1/0/33
Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/38, Gi1/0/41, Gi1/0/42
Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46, Gi1/0/47, Gi1/0/48
Gi2/0/2, Gi2/0/6, Gi2/0/7, Gi2/0/8, Gi2/0/9, Gi2/0/10, Gi2/0/14

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
Gi2/0/15, Gi2/0/19, Gi2/0/20, Gi2/0/21, Gi2/0/24, Gi2/0/26
Gi2/0/27, Gi2/0/28, Gi2/0/30, Gi2/0/31, Gi2/0/32, Gi2/0/33
Gi2/0/34, Gi2/0/35, Gi2/0/36, Gi2/0/37, Gi2/0/38, Gi2/0/39
Gi2/0/40, Gi2/0/42, Gi2/0/43, Gi2/0/44, Gi2/0/45, Gi2/0/46
Gi2/0/47, Gi2/0/48, Gi3/0/1, Gi3/0/6, Gi3/0/7, Gi3/0/8, Gi3/0/9
Gi3/0/11, Gi3/0/12, Gi3/0/13, Gi3/0/14, Gi3/0/16, Gi3/0/17
Gi3/0/18, Gi3/0/19, Gi3/0/20, Gi3/0/21, Gi3/0/22, Gi3/0/23
Gi3/0/24, Gi3/0/25, Gi3/0/26, Gi3/0/27, Gi3/0/28, Gi3/0/30
Gi3/0/31, Gi3/0/32, Gi3/0/33, Gi3/0/34, Gi3/0/36, Gi3/0/37
Gi3/0/42, Gi3/0/44, Gi3/0/45, Gi3/0/46
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
99 enet 100099 1500 - - - - - 0 0
100 enet 100100 1500 - - - - - 0 0
102 enet 100102 1500 - - - - - 0 0
110 enet 100110 1500 - - - - - 0 0
172 enet 100172 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0

Remote SPAN VLANs
------------------------------------------------------------------------------

Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------

[Martin L]

sometimes those ports get stuck.  it must be shut before changing configs.  shut it down, remove all config, add config, no shut.

Or shut it down, default port to its original config with default interface GigabitEthernet1/0/22, then add your config and do no shut

Regards, ML
**Please Rate All Helpful Responses **

[blait]

Martin,

I did as you requested but the port still does not appear in sh vlan.

[Martin L]

is the port shows up in show interface trunk ?

if you can do TDR cable test on that port. I would use another port since I think 1/0/22 is possibly bad port; it happens on those old switches after awhile; 

[blait]

Martin,

No, it doesn't show up in sh int trunk.

Switch1#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/49 on 802.1q trunking 1
Gi1/0/50 on 802.1q trunking 1
Gi1/0/51 on 802.1q trunking 1
Gi1/0/52 on 802.1q trunking 1
Gi2/0/49 on 802.1q trunking 1
Gi2/0/50 on 802.1q trunking 1
Gi2/0/51 on 802.1q trunking 1
Gi2/0/52 on 802.1q trunking 1
Gi3/0/2 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/49 1-4094
Gi1/0/50 1-4094
Gi1/0/51 1-4094
Gi1/0/52 1-4094
Gi2/0/49 1-4094
Gi2/0/50 1-4094
Gi2/0/51 1-4094
Gi2/0/52 1-4094
Gi3/0/2 1-4094

Port Vlans allowed and active in management domain
Gi1/0/49 1,10,20,99-100,102,110,172
Gi1/0/50 1,10,20,99-100,102,110,172
Gi1/0/51 1,10,20,99-100,102,110,172
Gi1/0/52 1,10,20,99-100,102,110,172
Gi2/0/49 1,10,20,99-100,102,110,172
Gi2/0/50 1,10,20,99-100,102,110,172
Gi2/0/51 1,10,20,99-100,102,110,172
Gi2/0/52 1,10,20,99-100,102,110,172
Gi3/0/2 1,10,20,99-100,102,110,172

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/49 1,10,20,99-100,102,110,172
Gi1/0/50 1,10,20,99-100,102,110,172
Gi1/0/51 1,10,20,99-100,102,110,172
Gi1/0/52 1,10,20,99-100,102,110,172
Gi2/0/49 1,10,20,99-100,102,110,172
Gi2/0/50 1,10,20,99-100,102,110,172

Port Vlans in spanning tree forwarding state and not pruned
Gi2/0/51 1,10,20,99-100,102,110,172
Gi2/0/52 1,10,20,99-100,102,110,172
Gi3/0/2 1,10,20,99-100,102,110,172

[blait]

Martin,

Sorry, it took me a while to figure out how to do this.

Switch1#test cable-diagnostics tdr int g1/0/22
TDR test started on interface Gi1/0/22
A TDR test can take a few seconds to run on an interface
Use 'show cable-diagnostics tdr' to read the TDR results.

Switch1#show cable-diagnostics tdr int g1/0/22
TDR test last run on: October 01 17:30:10

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/22 1000M Pair A 0 +/- 4 meters Pair A Normal
Pair B 0 +/- 4 meters Pair B Normal
Pair C 1 +/- 4 meters Pair C Normal
Pair D 0 +/- 4 meters Pair D Normal

[balaji.bandi]

Try -  default interface GigabitEthernet1/0/22, configure again and let us know.

[blait]

balaji.bandi,

That did remove all the configuration from the interface, but the interface still does not appear in any vlan.

[balaji.bandi]

removing not solve some time i seen this issue - not sure what version.

config t

default interface GigabitEthernet1/0/22

interface GigabitEthernet1/0/22

paster the config here

[blait]

balaji.bandi,

Switch1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch1(config)#default int g1/0/22
Interface GigabitEthernet1/0/22 set to default configuration
Switch1(config)#
Switch1#sh run int g1/0/22
Building configuration...

Current configuration : 39 bytes
!
interface GigabitEthernet1/0/22
end

Switch1#sh vlan

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/37, Gi1/0/39, Gi1/0/40, Gi2/0/1, Gi2/0/3, Gi2/0/4
Gi2/0/5, Gi2/0/11, Gi2/0/13, Gi2/0/16, Gi2/0/17, Gi2/0/18
Gi2/0/23, Gi2/0/25, Gi2/0/29, Gi2/0/41, Gi3/0/3, Gi3/0/4
Gi3/0/5, Gi3/0/10, Gi3/0/15, Gi3/0/29, Gi3/0/35, Gi3/0/38
Gi3/0/40, Gi3/0/41, Gi3/0/47, Gi3/0/49, Gi3/0/50, Gi3/0/51
Gi3/0/52
10 PIX-Outside active
20 VLAN0020 active Gi2/0/22, Gi3/0/43, Gi3/0/48
99 VLAN0099 active
100 VLAN0100 active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7
Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13
Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19
Gi1/0/20, Gi1/0/21, Gi1/0/23, Gi1/0/24, Gi1/0/26, Gi1/0/27
Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33
Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45
Gi1/0/46, Gi1/0/47, Gi1/0/48, Gi2/0/2, Gi2/0/7, Gi2/0/8
Gi2/0/9, Gi2/0/10, Gi2/0/12, Gi2/0/14, Gi2/0/15, Gi2/0/20
Gi2/0/21, Gi2/0/23, Gi2/0/24, Gi2/0/26, Gi2/0/27, Gi2/0/28
Gi2/0/30, Gi2/0/31, Gi2/0/32, Gi2/0/33, Gi2/0/34, Gi2/0/35
Gi2/0/36, Gi2/0/37, Gi2/0/38, Gi2/0/39, Gi2/0/40, Gi2/0/42
Gi2/0/43, Gi2/0/44, Gi2/0/45, Gi2/0/46, Gi2/0/47, Gi2/0/48
Gi3/0/5, Gi3/0/6, Gi3/0/8, Gi3/0/9, Gi3/0/11, Gi3/0/12
Gi3/0/13, Gi3/0/16, Gi3/0/17, Gi3/0/18, Gi3/0/19, Gi3/0/20
Gi3/0/21, Gi3/0/22, Gi3/0/23, Gi3/0/24, Gi3/0/25, Gi3/0/26
Gi3/0/27, Gi3/0/28, Gi3/0/29, Gi3/0/30, Gi3/0/31, Gi3/0/32
Gi3/0/33, Gi3/0/34, Gi3/0/36, Gi3/0/37, Gi3/0/38, Gi3/0/39
Gi3/0/42, Gi3/0/44, Gi3/0/45, Gi3/0/46
102 VLAN0102 active
110 VLAN0110 active
172 VLAN0172 active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7
Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13
Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19
Gi1/0/20, Gi1/0/21, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26
Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/32, Gi1/0/33
Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/38, Gi1/0/41, Gi1/0/42
Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46, Gi1/0/47, Gi1/0/48
Gi2/0/2, Gi2/0/6, Gi2/0/7, Gi2/0/8, Gi2/0/9, Gi2/0/10, Gi2/0/14

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
Gi2/0/15, Gi2/0/19, Gi2/0/20, Gi2/0/21, Gi2/0/24, Gi2/0/26
Gi2/0/27, Gi2/0/28, Gi2/0/30, Gi2/0/31, Gi2/0/32, Gi2/0/33
Gi2/0/34, Gi2/0/35, Gi2/0/36, Gi2/0/37, Gi2/0/38, Gi2/0/39
Gi2/0/40, Gi2/0/42, Gi2/0/43, Gi2/0/44, Gi2/0/45, Gi2/0/46
Gi2/0/47, Gi2/0/48, Gi3/0/1, Gi3/0/6, Gi3/0/7, Gi3/0/8, Gi3/0/9
Gi3/0/11, Gi3/0/12, Gi3/0/13, Gi3/0/14, Gi3/0/16, Gi3/0/17
Gi3/0/18, Gi3/0/19, Gi3/0/20, Gi3/0/21, Gi3/0/22, Gi3/0/23
Gi3/0/24, Gi3/0/25, Gi3/0/26, Gi3/0/27, Gi3/0/28, Gi3/0/30
Gi3/0/31, Gi3/0/32, Gi3/0/33, Gi3/0/34, Gi3/0/36, Gi3/0/37
Gi3/0/42, Gi3/0/44, Gi3/0/45, Gi3/0/46
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
99 enet 100099 1500 - - - - - 0 0
100 enet 100100 1500 - - - - - 0 0
102 enet 100102 1500 - - - - - 0 0
110 enet 100110 1500 - - - - - 0 0
172 enet 100172 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0

Remote SPAN VLANs
------------------------------------------------------------------------------

Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------

[balaji.bandi]

can you post show version and show switch

[blait]

BB

Switch1#sh ver
Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(55)SE11, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Wed 17-Aug-16 13:28 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02D00000

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

Switch1 uptime is 2 years, 22 weeks, 2 days, 5 hours, 14 minutes
System returned to ROM by power-on
System restarted at 10:54:07 EDT Sun Apr 29 2018
System image file is "flash:/c3750-ipbasek9-mz.122-55.SE11.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

cisco WS-C3750G-48PS (PowerPC405) processor (revision C0) with 131072K bytes of memory.
Processor board ID FOC0933U10Z
Last reset from power-on
4 Virtual Ethernet interfaces
156 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:15:2B:96:B6:80
Motherboard assembly number : 73-9365-08
Power supply part number : 341-0108-02
Motherboard serial number : FOC09323HQ0
Power supply serial number : DCA09260LAY
Model revision number : C0
Motherboard revision number : A0
Model number : WS-C3750G-48PS-S
System serial number : FOC0933U10Z
SFP Module assembly part number : 73-7757-03
SFP Module revision Number : A0
SFP Module serial number : CAT09290LC9
Top Assembly Part Number : 800-25408-02
Top Assembly Revision Number : A0
Version ID : 02
CLEI Code Number : CNMWN00ARB
Hardware Board Revision Number : 0x05

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
1 52 WS-C3750G-48PS 12.2(55)SE11 C3750-IPBASEK9-M
2 52 WS-C3750G-48PS 12.2(55)SE11 C3750-IPBASEK9-M
* 3 52 WS-C3750G-48PS 12.2(55)SE11 C3750-IPBASEK9-M

Switch 01
---------
Switch Uptime : 2 years, 12 weeks, 1 day, 6 hours, 33 minutes
Base ethernet MAC Address : 00:1A:A1:67:48:80
Motherboard assembly number : 73-10216-08
Power supply part number : 341-0108-03
Motherboard serial number : FOC10501LY0
Power supply serial number : DCA1046A1BN
Model revision number : F0
Motherboard revision number : C0
Model number : WS-C3750G-48PS-S
System serial number : FOC1050Y4TC
Top assembly part number : 800-26853-01
Top assembly revision number : B0
Version ID : V05
CLEI Code Number : 449724

Switch 02
---------
Switch Uptime : 2 years, 22 weeks, 2 days, 6 hours, 3 minutes
Base ethernet MAC Address : 00:19:2F:31:3E:00
Motherboard assembly number : 73-10216-13
Power supply part number : 341-0108-04
Motherboard serial number : FOC10331KA6
Power supply serial number : DCA1812A03F
Model revision number : F0
Motherboard revision number : C0
Model number : WS-C3750G-48PS-S
System serial number : FOC1033Y2DE
SFP Module serial number : NSN
Top assembly part number : 800-26853-05
Top assembly revision number : E0
Version ID : V10
CLEI Code Number : COMB300BRC

Configuration register is 0xF

[blait]

Switch1#sh switch
Switch/Stack Mac Address : 0015.2b96.b680
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
1 Member 001a.a167.4880 15 0 Ready
2 Member 0019.2f31.3e00 1 0 Ready
*3 Master 0015.2b96.b680 1 0 Ready

[balaji.bandi]

Looks good - can you post-show interface GigabitEthernet1/0/22 switchport

[blait]

Switch1#show interface GigabitEthernet1/0/22 switchport
Name: Gi1/0/22
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: down
Administrative Trunking Encapsulation: negotiate
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 associations: none
Administrative private-vlan trunk mappings: 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