04-05-2006 04:13 AM - edited 03-03-2019 02:40 AM
Connecting a Cat 2950 to a Cat 6509 using a cross over cable. This comes up as trunk but I dont want it to.
When it was first connected, it led to some spanning tree errors as the port vlan at both ends were different. On the C2950, I had vlan 1 and on the C6509, I had Vlan 211. I change the port vlan to 1 on the C6509 and then this was ok but now it is trunking.
I dont want to trunk on these port. What I want it to create a connection as a normal access port in say vlan 211.
How do I do this?
And then after doing the above, will routers connected to the switch be able to talk to each other via vlan 211?
I am running CatOS on the 6509 and IOS on the 2950.
Thanks
04-05-2006 04:26 AM
HI
configure the ports as access ports for the vlan which u want.create the vlan both on 6509 and 2950.
disable trunking on the ports.see that all u r routers are in vlan which u want ie 211.
Foe eg
on 6509
set vlan 211 2/2
and on 2950
switchport mode access
switchport access vlan 211
Thanks
Mahmood
04-05-2006 04:27 AM
Hi,
Do the following
On 2950
conf t
int fa x/y
switchport mode access
switchport access vlan
switchport nonegotiate
On Cat 6500
If trunk is there then,
set trunk x/y off
set vlan x (vlan#) y/z (port#)
for example
set trunk 2/23 off
set vlan 100 2/23
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_8_1/cmd_ref/setsy_tr.htm#wp1170006
HTH, Please rate if it does.
-amit singh
04-05-2006 06:19 AM
Thanks Amit
The C2950 is on a remote site. The remote site have said that they do not have any VTP configured as the C2950 is being used as just a hub, so thereby the will not be able to configure vlan 100 for example on the C2950.
This leaves me with why the link came up as a trunk when the links were connected even though on the C6509, it was never configured as a trunk. I feel as if their side forced the C6509 into trunking.
So if they cannot create any extra vlan on their C2950, how else can I configure this connection as an access port?
04-05-2006 06:27 AM
********Why the link came up as trunk ? *****
Answer is, 2950 and 6500's support DTP (dynamic trunking protocol ) which means that if either side sends a DTP packet the other side will be able to form a trunk. This is what has happened.
Do the following thing on 2950 switchport :
conf t
int x/y --> port connected to 6500
switchport nonegotiate ** Try this command only first, it should work,if not try other **
switchport mode access
HTH, Please rate if it does.
-amit singh
04-05-2006 06:59 AM
Thanks Amit.
So after doing this, can we still leave the VLAN as default VLAN 1 at both ends and it wil not trunk?.
04-05-2006 07:04 AM
yes, You are good to go after that.
HTH, Please rate if it does.
-amit singh
04-05-2006 07:18 AM
Thank you so very much Amit. I really appreciate your help. I have another question which I will open another message for.
Thanks again.
04-05-2006 07:05 AM
The 2950 has a default of dynamic desirable on its ports so unless trunking is specifically shutoff on the 6500 it will create a trunk . If the 6500 trunk port is "auto" (default) or desirable the trunk link will come up , just turn the trunk off on the 6500 and the link will not trunk . You can shut it off on the 2950 also by making it an access port also.
04-05-2006 07:30 AM
Thank you very much Glen.
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