I am trying to add a new C2950-4 switch to ASA but some for reason the nearby 2950-2 will get shutdown due to spanning tree messages as soon as the interface is active.
ASA Port 1 is connected to a daisy-chain style C2950s and ASA port 2 is connected a brand new C2950-4 switch with nothing attached.
ASA
0/1-->C2950-2
interface Ethernet0/1
description SW1-0/23
switchport access vlan 100
0/2-->C2950-4
description SW4-0/47
switchport trunk allowed vlan 50,80,100,800
switchport mode trunk
shutdown
SW1
# sh run int fa 0/23
interface FastEthernet0/23
description uplink-rch01-0/1
switchport access vlan 100
switchport mode access
switchport nonegotiate
mls qos trust dscp
auto qos voip trust
macro description cisco-router
end
#sh spanning-tree summary
Switch is in pvst mode
Root bridge for: none
EtherChannel misconfig guard is enabled
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
UplinkFast is disabled
BackboneFast is disabled
Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0100 0 0 0 10 10
---------------------- -------- --------- -------- ---------- ----------
1 vlan 0 0 0 10 10
#sh cdp nei | in 2950
Fas 0/24 157 S I WS-C2950G-Fas 0/23
#sh run int fa 0/23
Building configuration...
Current configuration : 214 bytes
!
interface FastEthernet0/23
description uplink-rch01-0/1
switchport access vlan 100
switchport mode access
switchport nonegotiate
mls qos trust dscp
auto qos voip trust
macro description cisco-router
end
SW4
Interface FastEthernet0/47
description UPLINK-RCH01-0/2
switchport trunk allowed vlan 1,50,80,100,800
switchport mode trunk
Error Messages
Apr 25 17:55:31: %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthernet0/23 VLAN100.
Apr 25 17:55:31: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking FastEthernet0/23 on VLAN0100. Inconsistent port type.
