Communication problem between Cisco 3560 and Cisco SG300.

[jitesh.mahajan]

Dear Support,

I have a Cisco SG300 and Cisco 3560 switches.

3560 is my Core Switch and SG300 is access switch.

From 3560 VLAN information is not passed to SG300.

3560 Configuration:

interface GigabitEthernet0/23
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2,10,11
switchport mode trunk

SG300 Configuration:

interface gigabitethernet49
spanning-tree link-type point-to-point
switchport mode general
switchport general allowed vlan add 2,10-11 tagged
macro description switch

Please suggest how this issue is resolve.

Regards,

JItesh Mahajan.

[Aleksandra Dargiel]

Hi Jlitesh,

First of all please note Small Business switches are not supporting VTP but I guess you have noticed this since SG300 trunk is configured manually. 

Secondly your VLAN 1 is tagged on Catalyst while it is untagged (native) on SG300.

I would recommend you to remove VLAN 1 tagged from catalyst and add "switchport trunk native VLAN 1".

I hope this helps.

Aleksandra

[jitesh.mahajan]

Dear Aleksandra,

Thanks for your reply.

can you please send me the steps for this....

Regards,

JItesh Mahajan.

[Aleksandra Dargiel]

Hi Jltesh,

Please find below related commands:

catalyst(config)#interface gi0/23
catalyst(config-if)#switchport trunk allowed vlan remove vlan 1
catalyst(config-if)#switchport trunk native vlan 1

If you still have some problems on this trunk it would be worth checking mac address table for this port on each switch:

show mac address-table interfaces GigabitEthernet0/23 (or 49 when on SG300).

Regards,

Aleksandra

[jitesh.mahajan]

Dear Aleksandra,

Below Configuration is right or wrong for 3560 and SG300.

3560 Configuration:

interface GigabitEthernet0/23
switchport trunk encapsulation dot1q

switchport trunk allowed vlan remove VLAN 1

switchport native vlan 1
switchport trunk allowed vlan 1,2,10,11
switchport mode trunk

SG300 Configuration:

interface gigabitethernet49
spanning-tree link-type point-to-point
switchport mode general
switchport general allowed vlan add 2,10-11 tagged
macro description switch

Regards,

JItesh Mahajan.

[Aleksandra Dargiel]

Hi Jltesh,

I think the best way to verify this is to get the following command:

Catalyst: show interfaces trunk

SG300: show vlan

also show MAC address table interface [ge49 or ge0/23] to verify the operational status

Regards,

Aleksandra