Dear Mr. Tom,

Thank you for your answer!

This is the running ports:

This PO1 connect to C2960s

!

interface Port-channel1

description Connect To MO01

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 10,20,30,40,50,60,70,80,99

switchport mode trunk

switchport nonegotiate

storm-control broadcast level 10.00

This PO2 connect to SG300

!

interface Port-channel2

description Connect To MO02

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 10,20,30,40,50,60,70,80,99

switchport mode trunk

switchport nonegotiate

storm-control broadcast level 10.00

This is 2 ports connect to C2960s

!

interface GigabitEthernet1/0/11

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 10,20,30,40,50,60,70,80,99

switchport mode trunk

switchport nonegotiate

storm-control broadcast level 10.00

channel-group 1 mode active

!

interface GigabitEthernet1/0/12

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 10,20,30,40,50,60,70,80,99

switchport mode trunk

switchport nonegotiate

storm-control broadcast level 10.00

channel-group 1 mode active

This is 2 ports connect to SG300

!

interface GigabitEthernet1/0/13

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 10,20,30,40,50,60,70,80,99

switchport mode trunk

switchport nonegotiate

storm-control broadcast level 10.00

channel-group 2 mode active

!

interface GigabitEthernet1/0/14

switchport trunk encapsulation dot1q

switchport trunk native vlan 999

switchport trunk allowed vlan 10,20,30,40,50,60,70,80,99

switchport mode trunk

switchport nonegotiate

storm-control broadcast level 10.00

channel-group 2 mode active

!

Best regards,

Truoc

Hi Truoc, can you show the cdp neighbor detail from each switch (catalyst and smb)?

-Tom
Please mark answered for helpful posts

Dear Mr. Tom,

Actually I have 1 Catalyst 3750x-24, 1 Catalyst 2960s-48, 4 Cisco SG300-52 and some Linksys Cisco SRW2024.

Then I show 2 CDP neighbor on 2 swith to you, can you view this detail and help me how to fix my issue.

I saw the detail in Catalyst say Native VLAN in my SG300 is #1 but I already switch port-channel in SW300 to Native VLAN999!

Then now I can't switch manual port member channel to Native VLAN 999, the message as below:

MO02(config)#int gi49
MO02(config-if)#switchport trunk native vlan 999
Port gi49 belongs to a port-channel

Thank you so much!

Truoc.

Here is detail of CDP:

Catalyst C3750x

Core3750x#show cdp neighbors detail
-------------------------
Device ID: 70105c122f75
Entry address(es):
  IP address: 172.16.16.19
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/22,  Port ID (outgoing port): gi50
Holdtime : 170 sec

Version :
1.3.0.62

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 19500, Power available: 0, Power m
anagement level: -1
Management address(es):

-------------------------
Device ID: 70105c122f75
Entry address(es):
  IP address: 172.16.16.19
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/21,  Port ID (outgoing port): gi49
Holdtime : 170 sec

Version :
1.3.0.62

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 8397, Power available: 0, Power ma
nagement level: -1
Management address(es):

-------------------------
Device ID: C2960s
Entry address(es):
  IP address: 172.16.16.11
  IP address: 172.16.16.11
Platform: cisco WS-C2960S-48TS-L,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/11,  Port ID (outgoing port): GigabitEthernet1/0/4
8
Holdtime : 129 sec

Version :
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 15.0(2)SE4,
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Wed 26-Jun-13 02:59 by prod_rel_team

advertisement version: 2
Protocol Hello:  OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0AA7278
0000000000102270170105CA7278070105CA72780000000
VTP Management Domain: 'tmi.com'
Native VLAN: 999
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 1, Power available: 0, Power manag
ement level: -1
Management address(es):
  IP address: 172.16.16.11
  IP address: 172.16.16.11

-------------------------
Device ID: C2960s
Entry address(es):
  IP address: 172.16.16.11
  IP address: 172.16.16.11
Platform: cisco WS-C2960S-48TS-L,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/12,  Port ID (outgoing port): GigabitEthernet1/0/4
7
Holdtime : 129 sec

Version :
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 15.0(2)SE4,
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Wed 26-Jun-13 02:59 by prod_rel_team

advertisement version: 2
Protocol Hello:  OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0AA7278
0000000000102270170105CA7278070105CA72780000000
VTP Management Domain: 'tmi.com'
Native VLAN: 999
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 1, Power available: 0, Power manag
ement level: -1
Management address(es):
  IP address: 172.16.16.11
  IP address: 172.16.16.11

-------------------------
Device ID: 54781ae8dcf3
Entry address(es):
  IP address: 172.16.16.12
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/13,  Port ID (outgoing port): gi49
Holdtime : 122 sec

Version :
1.3.0.62

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 14202, Power available: 0, Power m
anagement level: -1
Management address(es):

-------------------------
Device ID: 54781ae8dcf3
Entry address(es):
  IP address: 172.16.16.12
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/14,  Port ID (outgoing port): gi50
Holdtime : 122 sec

Version :
1.3.0.62

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 531, Power available: 0, Power man
agement level: -1
Management address(es):

-------------------------
Device ID: 70105c121f1a
Entry address(es):
  IP address: 172.16.16.15
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/18,  Port ID (outgoing port): gi51
Holdtime : 179 sec

Version :
1.3.0.62

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 32174, Power available: 0, Power m
anagement level: -1
Management address(es):

-------------------------
Device ID: 70105c121f1a
Entry address(es):
  IP address: 172.16.16.15
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/17,  Port ID (outgoing port): gi52
Holdtime : 179 sec

Version :
1.3.0.62

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 14080, Power available: 0, Power m
anagement level: -1
Management address(es):

-------------------------
Device ID: 70105c1218af
Entry address(es):
  IP address: 172.16.16.17
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/20,  Port ID (outgoing port): gi50
Holdtime : 127 sec

Version :
1.2.9.44

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 8954, Power available: 0, Power ma
nagement level: -1
Management address(es):

-------------------------
Device ID: 70105c1218af
Entry address(es):
  IP address: 172.16.16.17
Platform: Cisco SG300-52 (PID:SRW2048-K9)-VSD,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/19,  Port ID (outgoing port): gi49
Holdtime : 127 sec

Version :
1.2.9.44

advertisement version: 2
Native VLAN: 1
Duplex: full
Power Available TLV:

    Power request id: 0, Power management id: 22873, Power available: 0, Power m
anagement level: -1
Management address(es):

Core3750x#

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

Cisco SG300:

MO02#show cdp neighbors detail
---------------------------------------------
Device-ID: Core3750x
Advertisement version: 2
Platform: cisco WS-C3750X-24
Capabilities: Router Switch IGMP
Interface: gi49, Port ID (outgoing port): GigabitEthernet1/0/13
Holdtime: 138
Version: Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.
0(2)SE4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Cop
Duplex: full
Native VLAN: 999
SysObjectID: 0.0
VTP Management Domain: tmi.com
Primary Management Address: IP 192.168.0.1,
Secondary Management Address: IP 192.168.0.1,
Addresses:
          IP 192.168.0.1
          IP 192.168.0.1
---------------------------------------------
Device-ID: Core3750x
Advertisement version: 2
Platform: cisco WS-C3750X-24
Capabilities: Router Switch IGMP
Interface: gi50, Port ID (outgoing port): GigabitEthernet1/0/14
Holdtime: 138
Version: Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.
0(2)SE4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Cop
Duplex: full
Native VLAN: 999
SysObjectID: 0.0
VTP Management Domain: tmi.com
Primary Management Address: IP 192.168.0.1,
Secondary Management Address: IP 192.168.0.1,
Addresses:
          IP 192.168.0.1
          IP 192.168.0.1
MO02#

Hi Truoc, so it is the problem, your smb switch native vlan is 1 when it should be 999. How to fix it would be to delete the link aggregation on the smb switch then recreate it. Before making other commands for vlans you need to use the command

switchport mode trunk

switchport trunk native vlan 999

then you may do your additional vlans

switchport trunk allowed vlan add .... .... .... ....

When you create a LAG on the smb switch it cannot be a member of any vlan so it will default to vlan 1 which is where your untag packet resides. So once the lag has been created you need to modify the default vlan first then tag your packets.

Also if you don't want to delete the lag I believe you can remove all vlans off the lag then modify the default vlan

switchport trunk allowed vlan remove ....

-Tom
Please mark answered for helpful posts

Dear Mr. Tom,

I try to do as your guide for step by step but still can't.

1. If I setup 1 port to native vlan 999, is it work. I saw PVID in web config of this port displayed 999

2. If I setup LAG to native vlan 999 after that I setup 2 port to LAG, I saw the PVID in web config is: LAG have PVID 999, port have PVID 1. Still have same CDP message.

Now, I try to setup default vlan to 999 and reboot the switch, all is work. No CDP message showing...

So I don't know this setup good or not?! Please advise!

Thank and best regards,

Truoc

Hi Truoc, the default vlan should not make any difference.

Here is how I configured my switch-

config t

vlan database

vlan 999

int fa01

channel-group 1 mode on

int fa02

channel-group 1 mode on

int po1

switchport trunk native vlan 999

end

wr mem

This makes my etherchannel vlan 999 untagged without error.

-Tom
Please mark answered for helpful posts

Dear Mr. Tom,

I reset my SG300 to default and do the setting same as your config, result is: po1 untagged vlan 999 but interface gi1 and gi2 still untagged vlan 1.

Best regards,

Truoc

I have the same situation, but all vlan is the same. Could you help me?

switch42f189#show interfaces switchport ge52
Port : gi52
Port Mode: Trunk
Gvrp Status: disabled
Ingress Filtering: true
Acceptable Frame Type: admitAll
Ingress UnTagged VLAN ( NATIVE ): 1

Port is member in:

Vlan               Name               Egress rule Port Membership Type
---- -------------------------------- ----------- --------------------
 1                  1                  Untagged          Static
 2               Name 2                 Tagged           Static
 40              Name 3                 Tagged           Static
 50              Name 3                 Tagged           Static
 51              Name 4                 Tagged           Static
 52              Name 5                 Tagged           Static
 53              Name 6                 Tagged           Static
 54              Name 7                 Tagged           Static

Forbidden VLANS:
Vlan               Name
---- --------------------------------

Classification rules:
switch42f189#12-Jan-2014 18:24:35 %CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi52.

Everybody find a solution to this problem ?

In fact, i have the same problem.

anyone found a solution? have a similar problem but on a sg350 -> 3750