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SG550x Trunking issue

Fotiosmark
Level 1
Level 1

Hello people, Bought 4 SG550X and seems I am stumped on the "Trunking" stuff.

On my cisco 3750 I have connect a Server to a trunking port dot1q, which as per Cisco, it passes all the VLAN traffic.  (See below)

 

SW-ATH-FL-1-2-cop2#sh run int gi0/11
interface GigabitEthernet0/11
 switchport trunk encapsulation dot1q
 switchport mode trunk
 duplex full

 

SW-ATH-FL-1-2-cop2#sh mac address-table interface gi0/11
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    40f2.e951.fbae    DYNAMIC     Gi0/11
  11    0050.568f.0474    DYNAMIC     Gi0/11
  11    0050.568f.4011    DYNAMIC     Gi0/11
  11    0050.56a9.07a7    DYNAMIC     Gi0/11
  11    0050.56a9.2670    DYNAMIC     Gi0/11
  11    0050.56a9.2f5d    DYNAMIC     Gi0/11
  11    0050.56a9.6426    DYNAMIC     Gi0/11
  55    0050.568f.0aa8    DYNAMIC     Gi0/11
  55    0050.568f.127d    DYNAMIC     Gi0/11
  55    0050.568f.1284    DYNAMIC     Gi0/11
  55    0050.568f.1285    DYNAMIC     Gi0/11
  55    0050.568f.1286    DYNAMIC     Gi0/11

 

 

SW-ATH-FL-1-2-cop2#sh int gi0/11 switchport
Name: Gi0/11
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
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

 

So as you can see it passes Vlan 11, 55, and depends in what subnet each VM is working on :)

 

Now on SG550X (which Cisco made some unnecessary changes)

I have connected a simple Laptop with a VM. My laptop is on VLAN 55 and VM is on Vlan 11

 

SG-ATH-FL-1-2#sh run int gi2/0/3
interface GigabitEthernet2/0/3
 spanning-tree portfast
 switchport mode trunk

 

And it seems that it won't recognize those 2 VLANS on its Trunk Interface

SG-ATH-FL-1-2#sh mac address-table interface gi2/0/3
Flags: I - Internal usage VLAN
Aging time is 300 sec

    Vlan          Mac Address         Port       Type    
------------ --------------------- ---------- ----------
     1         00:0c:29:b7:83:24    gi2/0/3    dynamic   
     1         a0:d3:c1:56:41:4d    gi2/0/3    dynamic  

 

 

SG-ATH-FL-1-2#sh int switchport gi2/0/3
Gathering information...

S-VLAN Ethernet Type:  0x8100 (802.1q)
Name: gi2/0/3
Switchport: enable
Administrative Mode: trunk
Operational Mode: up
Access Mode VLAN: 1
Access Multicast TV VLAN: none
Trunking Native Mode VLAN: 1
Trunking VLANs: 1,11,55,100
                        2-10,12-54,56-99,101-4094 (Inactive)
General PVID: 1
General VLANs: none
General Egress Tagged VLANs: none
General Forbidden VLANs: none
General Ingress Filtering: enabled
General Acceptable Frame Type: all
General GVRP status: disabled
Customer Mode VLAN: none
Customer Multicast TV VLANs: none
Private-vlan promiscuous-association primary VLAN: none
Private-vlan promiscuous-association Secondary VLANs: none
Private-vlan host-association primary VLAN: none
Private-vlan host-association Secondary VLAN: none

VLAN Mapping Tunnel:
S-VLAN Ethernet Type:   0x0x8100 (802.1q)
  C-VLANs         Outer S-VLANs
------------    ---------------

VLAN Mapping One-to-one:
  C-VLANs         Translated S-VLANs
------------    --------------------

Classification rules:

Classification type Group ID VLAN ID
------------------- -------- -------

 

 

Anybody has any idea why theres this behavior or should I sent the SG550 back to cisco? :)

 

Thank you!!!

1 Accepted Solution

Accepted Solutions

Hello,

 

this might sound too basic, but with these small business switches, the first thing you want to do is make sure you run the latest firmware, 2.3.5.63 in your case. Which one do you currently have installed ?

View solution in original post

5 Replies 5

Fotiosmark
Level 1
Level 1
no one? :) kinda difficult...SG550x has more problems than it solves

Fotiosmark
Level 1
Level 1

anyone?

Hello,

 

this might sound too basic, but with these small business switches, the first thing you want to do is make sure you run the latest firmware, 2.3.5.63 in your case. Which one do you currently have installed ?

the issue wasn't the firmware.

The issue was that a Layer 3 Switch had Vlans, and the Layer 2 switch had only Vlan 1 (the default)

So all Vlans (depending what IP and switchport were used) were being transfered to Vlan 1, and from there to the routers.

No the best practise...but thats how the customer network is already build.

To mitigate the issue I needed to create same Vlans, on all switches and make InterVlan routing.

 

Hello,

 

glad you got it resolved...

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