As an update to my earlier posting (thanks to all that replied), could somebody clarify this: 4908 as a hub, with 3548's at the spokes, single gig link from each 3548 to the 4908. Requirement is to disable STP. We are trying to prove that spanning tree isn't causing a particular problem. We are taking the config back to basics, and don't have any potential L2 loops (fingers crossed!), and we are trying to confirm that by having spanning-disabled on the gigabit interfaces, if one of these links went down, the BVI would not force a TCN (the 4908 is the root bridge) and possibly cause the 4908 to hang. The network is suffering, and we need to prove to the parent company that it is not spanning tree causing the problems, so need to ensure that there is nothing wrong with the BVI interface configuration. Basically, if I pull a link to one of the 3548's, is it possible that the 4908 could try running STP, and cause network degradation/packet loss? I don't think it should, as the 4908 is the root bridge, and shouldn't be sending BPDU's to the other switches as spanning-disabled has been configured on each sub-interface (see config below) Thanks in advance Regards Shaun ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname 4908-01 ! ip subnet-zero ipx routing 0002.0002.0002 bridge irb ! interface GigabitEthernet1 ip address 10.192.1.1 255.255.255.0 no ip directed-broadcast shutdown ! interface GigabitEthernet2 ip address 10.192.2.1 255.255.255.0 no ip directed-broadcast shutdown ! interface GigabitEthernet3 no ip address no ip directed-broadcast ! interface GigabitEthernet3.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 spanning-disabled ! interface GigabitEthernet3.2 encapsulation isl 2 no ip redirects no ip directed-broadcast bridge-group 2 spanning-disabled ! interface GigabitEthernet3.3 encapsulation isl 3 no ip redirects no ip directed-broadcast bridge-group 3 spanning-disabled ! interface GigabitEthernet4 no ip address no ip directed-broadcast ! interface GigabitEthernet4.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 spanning-disabled ! interface GigabitEthernet4.2 encapsulation isl 2 no ip redirects no ip directed-broadcast bridge-group 2 spanning-disabled ! interface GigabitEthernet4.3 encapsulation isl 3 no ip redirects no ip directed-broadcast bridge-group 3 spanning-disabled ! interface GigabitEthernet5 no ip address no ip directed-broadcast ! interface GigabitEthernet5.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 spanning-disabled ! interface GigabitEthernet5.2 encapsulation isl 2 no ip redirects no ip directed-broadcast bridge-group 2 spanning-disabled ! interface GigabitEthernet5.3 encapsulation isl 3 no ip redirects no ip directed-broadcast bridge-group 3 spanning-disabled ! interface GigabitEthernet6 no ip address no ip directed-broadcast ! interface GigabitEthernet6.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 spanning-disabled ! interface GigabitEthernet6.2 encapsulation isl 2 no ip redirects no ip directed-broadcast bridge-group 2 spanning-disabled ! interface GigabitEthernet6.3 encapsulation isl 3 no ip redirects no ip directed-broadcast bridge-group 3 spanning-disabled ! interface GigabitEthernet7 no ip address no ip directed-broadcast ! interface GigabitEthernet7.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 spanning-disabled ! interface GigabitEthernet7.2 encapsulation isl 2 no ip redirects no ip directed-broadcast bridge-group 2 spanning-disabled ! interface GigabitEthernet7.3 encapsulation isl 3 no ip redirects no ip directed-broadcast bridge-group 3 spanning-disabled ! interface GigabitEthernet8 no ip address no ip directed-broadcast ! interface GigabitEthernet8.1 encapsulation isl 1 no ip redirects no ip directed-broadcast bridge-group 1 spanning-disabled ! interface GigabitEthernet8.2 encapsulation isl 2 no ip redirects no ip directed-broadcast bridge-group 2 spanning-disabled ! interface GigabitEthernet8.3 encapsulation isl 3 no ip redirects no ip directed-broadcast bridge-group 3 spanning-disabled ! interface BVI1 ip address 10.1.1.1 255.255.0.0 no ip redirects no ip directed-broadcast no ip route-cache cef ! interface BVI2 ip address 10.2.1.1 255.255.255.0 no ip redirects no ip directed-broadcast no ip route-cache cef ! interface BVI3 ip address 10.3.1.1 255.255.0.0 no ip redirects ip directed-broadcast no ip route-cache cef ipx network C21193 encapsulation SAP ipx network C31193 encapsulation NOVELL-ETHER secondary ! router rip network 10.0.0.0 ! ip classless ! snmp-server community public RO snmp-server community private RW ! bridge 1 protocol ieee bridge 1 route ip bridge 2 protocol ieee bridge 2 route ip bridge 3 protocol ieee bridge 3 route ip bridge 3 route ipx ! line con 0 exec-timeout 0 0 transport input none line aux 0 line vty 0 4 session-timeout 60 exec-timeout 60 0 login ! end This e-mail and any attachments may contain privileged, confidential and/or copyright information and is for the sole use of the intended addressee. 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