Several of our remote offices purchased some Extreme Summit X150 switches to replace a bunch of old unmanaged switches so we could get more insight and control on the network. In order to prep for that, I'm playing with a Summit X250 that I borrowed from a vendor. The problem is I can't get trunking to work between the X250 and the C2950 I've got it connected to. The two switches can see each other's mac addresses, so I know they're communicating, I just can't pass traffic over the trunk. Here's what I have:
Crossover cable between Summit X250 port 25 and Cisco 2950 port 3:
Summit X250 Side:
create vlan "MGT"
configure vlan MGT tag 1
configure vlan MGT add ports 25-26 tagged
configure vlan MGT ipaddress 192.168.200.6 255.255.255.128
enable ipforwarding vlan MGT
configure ports 25 auto off speed 100 duplex full
Cisco 2950 Side:
(ip address 192.168.200.42)
switchport mode trunk
no ip address
switchport trunk allowed vlan all
Everything I've been able to find on the subject says that this should work, yet I can't ping between the two. Any suggestions would be appreciated.
Assuming that the 2950 and the Extreme switches ip addresses are in the same subnet (/25 mask). My suspicion is that the issue is native vlan mismatch. Native vlan in cisco is NOT taggged with vlanID, so it comes out raw and it expects untagged packets to be in vlan 1. Your extreme has "configure vlan MGT tag 1" I suspect this is tagging the vlan 1 traffic with Dot1Q vlan ID. In order not to complicate things explaining native vlan concept, I suggested the following on 2950:
"switchport trunk native vlan 999" under the interface your trunking to the Extreme. Vlan 999 is just a dummy vlan to change the Native vlan on 2950. Try that and tyr to ping between them, I am sure that will work.