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Connect two Catalyst 3750G

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informatiquecns
Level 1
Level 1

‎11-25-2011 02:19 AM - edited ‎03-07-2019 03:35 AM

Hello,

I try to connect two switch Catalyst 3750G without success.

switch1 (192.168.2.10 vlan 2) <=> (192.168.2.11 vlan2) switch2

I use this configuration for swich1 :

enable

configure terminal

enable password MDP

end

copy running-config startup-config

configure terminal

hostname switch1

interface vlan 2

ip address 192.168.2.10 255.255.255.0
exit

ip default-gateway 192.168.2.252

end

copy running-config startup-config

configure terminal

vlan 2

name zone_client

end

copy running-config startup-config

configure Terminal

interface Gi1/0/3

switchport mode trunk

switchport trunk encapsulation dot1q

switchport nonegotiate

switchport trunk native vlan 2

switchport trunk allowed vlan 1,2,3,4

end

copy running-config startup-config

I use this configuration for swich2 :

enable

configure terminal

enable password MDP

end

copy running-config startup-config

configure terminal

hostname switch1

interface vlan 2

ip address 192.168.2.11 255.255.255.0
exit

ip default-gateway 192.168.2.252

end

copy running-config startup-config

configure terminal

vlan 2

name zone_client

end

copy running-config startup-config


configure Terminal

interface Gi1/0/3

switchport mode trunk

switchport trunk encapsulation dot1q

switchport nonegotiate

switchport trunk native vlan 2

switchport trunk allowed vlan 1,2,3,4

end

copy running-config startup-config

when i use ping in console terminal, ping fail.

Somebody can help me?

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cadet alain
VIP Alumni
VIP Alumni
In response to informatiquecns

‎11-28-2011 02:57 AM

Hi,

it didn't take the switchport mode trunk command because you configured it before switchport trunk encapsulation dot1q

so reenter this command switchport mode trunk and it should be good,  I still wonder how I didn't remark that before.

Regards.

Alain

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Thotsaphon Lueangwattanaphong
Level 7
Level 7
In response to informatiquecns

‎11-28-2011 02:58 AM

Hi,

    You need to add "switchport mode trunk" on Gi1/0/3 on both switches.

!

interface GigabitEthernet1/0/3

switchport trunk encapsulation dot1q

switchport trunk native vlan 2

switchport trunk allowed vlan 1-4

switchport mode trunk

!

HTH,

Toshi

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cadet alain
VIP Alumni
VIP Alumni
In response to informatiquecns

‎11-28-2011 07:39 AM

Hi,

PC<=>(Vlan 2 in access mode)switch1(vlan 2 in trunk mode)<=> (vlan in tagged mode ) HP swich <=> Gateway

If on sw1 Vlan 2 is the native vlan , it will be sent on the trunk untagged so it must be untagged also on the HP switch or you can force tagging of vlan 2( the native vlan) on the Cisco with the global config command: vlan dot1q tag native

Regards.

Alain

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cadet alain
VIP Alumni
VIP Alumni

‎11-25-2011 03:00 AM

Hi,

verify your vlan interface is up/up ---> sh ip int br | i Vlan

Regards.

Alain

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informatiquecns
Level 1
Level 1
In response to cadet alain

‎11-25-2011 05:24 AM

Thank you cadet alain for your reply.

switch2>
switch2>enable
Password:
switch2#sh ip int br | i Vlan
Vlan1                  unassigned      YES unset  up                    up
Vlan2                  192.168.2.11    YES manual up                    down
switch2#


switch1>enable
Password:
switch1#sh ip int br | i Vlan
Vlan1                  unassigned      YES unset  up                    up
Vlan2                  192.168.2.10    YES manual up                    down
switch1#

I don't understand what is down. Can you explain?

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cadet alain
VIP Alumni
VIP Alumni
In response to informatiquecns

‎11-25-2011 05:44 AM

Hi,

what is the output of :

show vlan brief

sh spanning-tree vlan 2

Regards.

Alain

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informatiquecns
Level 1
Level 1
In response to cadet alain

‎11-28-2011 01:06 AM

switch1#sh ip int br | i Vlan
Vlan1                  unassigned      YES manual up                    up
Vlan2                  192.168.2.10    YES manual up                    down
switch1#show vlan brief

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          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
                                                Gi1/0/22, Gi1/0/23, Gi1/0/24
                                                Gi1/0/25, Gi1/0/26, Gi1/0/27
                                                Gi1/0/28
2    zone_client                      active
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
switch1#
switch1#sh spanning-tree vlan 2

Spanning tree instance(s) for vlan 2 does not exist.

switch1#

Gi1/0/3 doesn't seems in VLAN 2 but i don't know why...

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Thotsaphon Lueangwattanaphong
Level 7
Level 7
In response to informatiquecns

‎11-28-2011 01:16 AM

Hello,

    Please post "show interface trunk" on both switches.

Toshi

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informatiquecns
Level 1
Level 1
In response to Thotsaphon Lueangwattanaphong

‎11-28-2011 01:27 AM

switch2#show interface trunk

switch1#show interface trunk

switch1#

(answer nothing )

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Thotsaphon Lueangwattanaphong
Level 7
Level 7
In response to informatiquecns

‎11-28-2011 01:32 AM

Hello,

    it's kinda weird.  Please post "show vtp status" and "show ip interface brief" on both switches. 

Toshi

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informatiquecns
Level 1
Level 1
In response to Thotsaphon Lueangwattanaphong

‎11-28-2011 01:51 AM

switch1#show vtp status

VTP Version                     : running VTP1 (VTP2 capable)

Configuration Revision          : 1

Maximum VLANs supported locally : 1005

Number of existing VLANs        : 6

VTP Operating Mode              : Server

VTP Domain Name                 :

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : *************************************

Configuration last modified by 0.0.0.0 at 3-1-93 00:05:45

Local updater ID is 0.0.0.0 (no valid interface found)

switch1#

switch2>enable

Password:

Password:

switch2#show vtp status

VTP Version                     : running VTP1 (VTP2 capable)

Configuration Revision          : 1

Maximum VLANs supported locally : 1005

Number of existing VLANs        : 6

VTP Operating Mode              : Server

VTP Domain Name                 :

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Disabled

MD5 digest                      : *************************************

Configuration last modified by 0.0.0.0 at 3-1-93 00:29:00

Local updater ID is 0.0.0.0 (no valid interface found)

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informatiquecns
Level 1
Level 1
In response to informatiquecns

‎11-28-2011 01:53 AM

switch1#show ip interface brief

Interface              IP-Address      OK? Method Status                Protocol

Vlan1                  unassigned      YES manual up                    up

Vlan2                  192.168.2.10    YES manual up                    down

GigabitEthernet1/0/1   unassigned      YES unset  down                  down

GigabitEthernet1/0/2   unassigned      YES unset  down                  down

GigabitEthernet1/0/3   unassigned      YES unset  up                    up

GigabitEthernet1/0/4   unassigned      YES unset  down                  down

GigabitEthernet1/0/5   unassigned      YES unset  down                  down

GigabitEthernet1/0/6   unassigned      YES unset  down                  down

GigabitEthernet1/0/7   unassigned      YES unset  down                  down

GigabitEthernet1/0/8   unassigned      YES unset  down                  down

GigabitEthernet1/0/9   unassigned      YES unset  down                  down

GigabitEthernet1/0/10  unassigned      YES unset  down                  down

GigabitEthernet1/0/11  unassigned      YES unset  down                  down

GigabitEthernet1/0/12  unassigned      YES unset  down                  down

GigabitEthernet1/0/13  unassigned      YES unset  down                  down

GigabitEthernet1/0/14  unassigned      YES unset  down                  down

GigabitEthernet1/0/15  unassigned      YES unset  down                  down

GigabitEthernet1/0/16  unassigned      YES unset  down                  down

GigabitEthernet1/0/17  unassigned      YES unset  down                  down

GigabitEthernet1/0/18  unassigned      YES unset  down                  down

GigabitEthernet1/0/19  unassigned      YES unset  down                  down

GigabitEthernet1/0/20  unassigned      YES unset  down                  down

GigabitEthernet1/0/21  unassigned      YES unset  down                  down

GigabitEthernet1/0/22  unassigned      YES unset  down                  down

GigabitEthernet1/0/23  unassigned      YES unset  down                  down

GigabitEthernet1/0/24  unassigned      YES unset  down                  down

GigabitEthernet1/0/25  unassigned      YES unset  down                  down

GigabitEthernet1/0/26  unassigned      YES unset  down                  down

GigabitEthernet1/0/27  unassigned      YES unset  down                  down

GigabitEthernet1/0/28  unassigned      YES unset  down                  down

switch1#

switch2#show ip interface brief

Interface              IP-Address      OK? Method Status                Protocol

Vlan1                  unassigned      YES manual up                    up

Vlan2                  192.168.2.11    YES manual up                    down

GigabitEthernet1/0/1   unassigned      YES unset  down                  down

GigabitEthernet1/0/2   unassigned      YES unset  down                  down

GigabitEthernet1/0/3   unassigned      YES unset  up                    up

GigabitEthernet1/0/4   unassigned      YES unset  down                  down

GigabitEthernet1/0/5   unassigned      YES unset  down                  down

GigabitEthernet1/0/6   unassigned      YES unset  down                  down

GigabitEthernet1/0/7   unassigned      YES unset  down                  down

GigabitEthernet1/0/8   unassigned      YES unset  down                  down

GigabitEthernet1/0/9   unassigned      YES unset  down                  down

GigabitEthernet1/0/10  unassigned      YES unset  down                  down

GigabitEthernet1/0/11  unassigned      YES unset  down                  down

GigabitEthernet1/0/12  unassigned      YES unset  down                  down

GigabitEthernet1/0/13  unassigned      YES unset  down                  down

GigabitEthernet1/0/14  unassigned      YES unset  down                  down

GigabitEthernet1/0/15  unassigned      YES unset  down                  down

GigabitEthernet1/0/16  unassigned      YES unset  down                  down

GigabitEthernet1/0/17  unassigned      YES unset  down                  down

GigabitEthernet1/0/18  unassigned      YES unset  down                  down

GigabitEthernet1/0/19  unassigned      YES unset  down                  down

GigabitEthernet1/0/20  unassigned      YES unset  down                  down

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cadet alain
VIP Alumni
VIP Alumni
In response to Thotsaphon Lueangwattanaphong

‎11-28-2011 01:54 AM

Hi Toshi,

He already posted the sh ip int br output and the vlan 2 interface was up/down

@ informatique cns: the vlan is active on switch 1 but it is not showing on g1/0/3 because this is a trunk

g1/0/3 is an access port in vlan 1 as sh vlan br outputs:

1    default                          active    Gi1/0/1, Gi1/0/2, Gi1/0/3

So as Toshi remarked and as your sh int trunk output proves there is something wrong with the trunk.

Can you do on both switches sh int g1/0/3 switchport and sh int g1/0/3 status and sh spanning-tree

@ Toshi by default VTP is OFF as Domain= null and if there is no trunk it can't anything

Regards.

Alain

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informatiquecns
Level 1
Level 1
In response to cadet alain

‎11-28-2011 02:04 AM

switch2#sh int g1/0/3 switchport
Name: Gi1/0/3
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 2 (zone_client)
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: 1-4
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
switch1#
switch1#
switch1#sh int g1/0/3 switchport
switch2#sh int g1/0/3 switchport
Name: Gi1/0/3
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 2 (zone_client)
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: 1-4
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

***************

switch1# sh int g1/0/3 status

Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/3                      connected    1          a-full a-1000 10/100/1000BaseTX
switch1#
switch2# sh int g1/0/3 status

Port      Name               Status       Vlan       Duplex  Speed Type
Gi1/0/3                      connected    1          a-full a-1000 10/100/1000BaseTX

****************

switch1# sh spanning-tree

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     2c3f.3876.0200
             Cost        4
             Port        3 (GigabitEthernet1/0/3)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     68bc.0ceb.8200
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/3             Root FWD 4         128.3    P2p


switch1#
switch2# sh spanning-tree

VLAN0001
  Spanning tree enabled protocol ieee
  Root ID    Priority    32769
             Address     2c3f.3876.0200
             This bridge is the root
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     2c3f.3876.0200
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/3             Desg FWD 4         128.3    P2p

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Thotsaphon Lueangwattanaphong
Level 7
Level 7
In response to cadet alain

‎11-28-2011 02:06 AM

Hi Alain,

     Ahh, he alreay posted the outout of "show ip int brief" ;- ). I just want to make sure that there is nothing wrong with vtp mismatch its gonna break the trunk.

     It seems your port acting as access port.  Operational Mode: static access.

    Please post "show running".  To make sure that you correctly configured.

HTH,

Toshi

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cadet alain
VIP Alumni
VIP Alumni
In response to Thotsaphon Lueangwattanaphong

‎11-28-2011 02:21 AM

Hi Toshi,

Bu why are these access ports as he configured them as unconditional trunks ?

We only got sw2 output for sh int switchport but  there is something strange:

switch2#sh int g1/0/3 switchport

Name: Gi1/0/3

  Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: native

Negotiation of Trunking: On  

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 2 (zone_client)

Administrative Native VLAN tagging: enabled

Is this the default to tag the native vlan ?  I don't think so 

Can the OP post the same output for sw1.

Regards.

Alain

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Thotsaphon Lueangwattanaphong
Level 7
Level 7
In response to cadet alain

‎11-28-2011 02:24 AM

Hi Alian,

      It should not be a problem with changing native vlan.  I need to see the whole configuration. It has to be Operational Mode: trunk.

HTH,

Toshi

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