ylchang at seawind
Aug 25, 2006, 11:01 PM
Post #3 of 4
Hi Jonathan and all,
vlan trunk between summit 400 and cisco 3750
[In reply to]
Thanks for all your help. The VLAN trunk between Summit400
and Cisco3750 is now working. What I did are,
1. on cisco3750
switchport trunk encap dot1q
switchport mode trunk
switchport trunk allow vlan 100,200
2. on Summit400
config vlan v100 add port 1 tag
config vlan v200 add port 1 tag
3. go back to cisco3750
(wait few seconds)
Then, the VLAN trunking works as expect.
BUT!!! another problem follows!!!
PCs on C3750 can now communicate with PCs on S400
without problem. But other cisco and summit switches
on S400 are now isolated!!!
I read some interface error messages on other cisco
switches (most of them are 2950) said they received
unexpected vlan-trunking information on a
%SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU
on non trunk GigabitEthernet0/1 VLAN1.
%SPANTREE-7-BLOCK_PORT_TYPE: Blocking GigabitEthernet0/1
on VLAN0001. Inconsistent port type.
I don't know why S400 sends tunking information to those
Finally, I have no choice to move all switch links from
"untagged" to "tagged" and config those 2950s GE uplinks
to VLAN trunking.
Does anyone has similar experience on this?
thanks and regards,
Jonathan Ruano wrote:
> I'm still getting acquainted to the Extreme swiches, but I'd check a
> couple of things:
> a) Make sure ip forwarding is enabled on the summit (not sure if these
> switches have/need this.)
> enable ipforwarding vlan "v100"
> b) VLAN 100 should be created on the cisco (e.g, conf term, vlan 100,
> exit, exit)
> You may want to see if you can see the Mac addresses of both devices on
> the switches.