So since this is a L3 integrated dell switch. Is it possible to hang this off a FEX or does the FEX only support end devices? I have bpduguard enabled on this port
this is the config on the port connected to the switch
lacp port-priority 32768
lacp rate normal
switchport mode access
no switchport dot1q ethertype
switchport access vlan 50
switchport trunk native vlan 1
switchport trunk allowed vlan 1-4094
spanning-tree port-priority 128
spanning-tree cost auto
spanning-tree link-type auto
spanning-tree port type edge
spanning-tree bpduguard enable
no spanning-tree bpdufilter
flowcontrol receive off
flowcontrol send on
link debounce time 100
snmp trap link-status
logging event port link-status default
logging event port trunk-status default
no ip dhcp snooping trust
no ip arp inspection trust
no ip verify source dhcp-snooping-vlan
Yes usually Fex are to be used only to connect the servers not to any third party switches.
One way to do it is configure the switch not to send BPDU, the HIF of the FEX will be able to connect to a switch. However, you can have a protential STP loop in your networ. Hense, this is not recommended.
************PLEASE RATE IF THIS INFO IS HELPFULL****************
Yes that enabled the port. But will it cause any loops? does enabling the bpdufilter on this port cause any problems?
I actually have 4 ports on this switch that I need to connect to the FEX. Would enabling bpdufilter on all 4 ports cause problems or do I need to setup some etherchannel?
ok I disabled STP on the L3 Dell and the interface came up.
on the fex I see this
sh spanning-tree interface ethernet 101/1/19 detail
Port 4196 (Ethernet101/1/19) of VLAN0050 is designated forwarding
Port path cost 4, Port priority 128, Port Identifier 128.4196
Designated root has priority 16434, address d867.d907.ffc1
Designated bridge has priority 16434, address d867.d907.ffc1
Designated port id is 128.4196, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
The port type is edge
Link type is point-to-point by default
Bpdu guard is enabled
Bpdu filter is enabled by default
BPDU: sent 11, received 0
BPDUs are being sent. Is that going to cause a loop?
if I added another link and disabled STP portfast on it, would that be a problem?
No it won't because STP will take the full 55-second cycle.
looks like this caused a problem. with 2 links on the switch attached to the fex and both enabled caused a loop. why would one be ok and 2 not?
stp was disabled only on the dell switch. not on the fex. i initially have only stp disabled on one of the dell switch ports and there was no loop. After i disbaled stp for the second link and did a shut and no shut on the cisco port side, everything came to a halt