connection to a non-cisco switch port

[selcuks2001]

Hello all,
We have a Cisco switch conencted to a non-Cisco switch. The switches are conencted to each other via a trunk port which carries 4 vlans.
The trunk port configuration of the Cisco switch seems to be easy.i.e. (Or only it seems to be so)

interface FastEthernet 0/1
switchport mode trunk

Are there any other configurations which has to be entered under the ethernet interface (trunk interface)? Will the native VLAN also be included in the configuration under the interface?
Regards
SSS

 

[RookThis]

what type of switches are they? i.e. model numbers...

connecting two switches together will require a reversing cable as well if I'm not mistaken.. Is it working for you now?

 

[ADB100]

By default if you configure an IOS switch to be a trunk (switchport mode trunk) then the defaults will be to allow all VLAN's and to set the Native VLAN to #1.
It is however recommended to have unique unused Native VLAN's per trunk or if possible use all tagged and don't have a Native VLAN (new feature but not available on all switches/IOS). It is also recommended to only specifically allow the VLAN's that need to pass. Make sure you don't introduce any STP issues though so get it down on paper first.

HTH

Andy

 

[selcuks2001]

Well let me give more detail.
On our site thereis a Extreme Networks Switch of ehich model is Summit48i. On the other site there is a Cisco 4500 switch. We want to connect them. Well it is obvious that we have to use crossover cable when connecting two switches but in this case we are connecting the switches with their Gigabit Ethernet ports. (We are using fiber optic patches.) So we don't need any crossover cables in this case.
If we connect two Summit48i switches together we won't face any problems in trunk ports. But there has been a problem if there is a Cisco switch on the other site. We don't know the reason yet. I am not so familiar with the native VLAN concept but as far as I have read some documents I doubt if our problem is resulting from this native VLAN concept.
Any help will be appreciated.
Regards
SSS

 

[RookThis]

Interesting that it's quite obvious.... and that you are using the fiber ports since your original post indicated FastEthernet... I have a suggestion... try CCO.

 

[ADB100]

Do you use the VLAN #1 for anything on the Extreme switches? I have had an issue previously where the Native VLAN is not configured on the Extreme end and the untagged packets were not being processed by the Extreme switch. The best bet is to create a specific VLAN to be used only as the Native VLAN and isn't actually configured for anything.
You should also disable DTP on the Cisco end by turning off negotiation:

interface GigabitEthernet0/1
switchport access vlan 4000
switchport trunk native vlan 4000
switchport trunk allowed vlan 10,20,30
switchport mode trunk
switchport nonegotiate

Also on Gigabit Ethernet fibre interfaces (SX or LX) you can enable or disable autonegotiation (NOT speed & duplex). It may be the Extreme doesn't support link negotiation so try disabling it on the Cisco end:

interface GigabitEthernet0/1
no negotiation auto


HTH

Andy

 

[chieftan]

Please also note that any Trunking to non Cisco devices will require the port to be configured for 802.1q trunking.

 

[ADB100]

The command to set the encapsulation is:

switchport trunk encapsulation dot1q

This must be entered before the command 'switchport mode trunk'.


Andy

 

[selcuks2001]

Okay guys,
I am telling the problem again: (Another case but the same problem)
Well,
There is a black diamond (BD 6808) one of which port is connected to a Cisco switch (Cisco Catalyst 3750) with GigabitEthernet ports.
The VLAN on BD6808 is ABC with the ip address 192.168.1.1/30. The port 4:4 is assigned to this ABC VLAN. The VLAN ID of the ABC VLAN is 66.
On Cisco site: The link comes to port 25 on Cisco 3750 switch. (GigabitEthernet 0/25). And the host with the ip address 192.168.1.2/30 is connected to the port 1.
The host (192.168.1.1) cannot ping the VLAN on BD6808 (192.168.1.2).
I tried the configurations above but the didn't work.
Namely;

CISCO

interface GigabitEthernet 0/25
switchport mode trunk
switchport nonegotiate
switchport trunk encapsulation dot1q
!
interface FastEthernet 0/1
switchport mode access
switchport access vlan 66
!

Extreme Site:

Extreme Switch# sh vlan ABC
VLAN Interface[111-26e] with name "ABC" created by user
Tagging: 802.1Q Tag 66
Priority: 802.1P Priority 7
IP: 192.168.1.1/255.255.255.252
STPD: None
Protocol: Match all unfiltered protocols.
Loopback: Disable
RateShape: Disable
QosProfile:QP1
QosIngress:None
Ports: 1. (Number of active ports=1)
Flags: (*) Active, (!) Disabled
(B) BcastDisabled, (R) RateLimited, (L) Loopback
(g) Load Share Group, (c) Cross Module Trunk
Tagged: *4:4(XYZT_BD)

I am not sure if I could tell the problem enough clear. If there are any unclear points please ask me.
Any help will be appreciated.
Regards...
SSS

 

[chieftan]

You MUST make sure both ends of a .1q trunk are configured the same ..... (Speed, Duplex...etc). Sometimes it is better to maually set these.

There should be no issues between the two devices as I have configured the same (BD6808 and Cisco Catalysts) with no issues.

Also, on the links ensure that you allow your specified VLAN through.

 

[selcuks2001]

chieftan, you mean that the configuration is enough? can you send me your interface configuration and the interface parameters?
regards...
SSS

 

[chieftan]

description **** User Port ****
switchport trunk encapsulation dot1q
switchport trunk native vlan (What you want)
switchport trunk allowed vlan (VLANs required)
switchport mode trunk
spanning-tree portfast trunk

You can manually enter Duplex and speed options if required.