11-03-2011 08:15 AM - edited 03-07-2019 03:11 AM
Hello,
I recently removed a catalyst 2950 switch code version: c2950-i6q4l2-mz.121-13.EA1
I had an ASA 5505 connected as a switchport access to the 2950 on port 44. We will call the VLAN that the ASA sits on: VLAN 404. The 2950 had a trunk to our catalyst 6509 distribution switch carrying that VLAN 404. We also have a another VLAN for computers that sits on: VLAN 129, this is a standard DHCP vlan and it accounted for the rest of the switchports. The 2950 also has this trunked to our 6509 distribution switch.
Everything was working fine with that setup.
After replacing the 2950 with a 3560 we started running into problems. The 3560 was configured the same exact way as the 2950. What was happening is that computers that sat on VLAN 129 started experiencing packet loss and were unable to work. It's as though the ASA was taking over the switch.
Is there a protocol that is enabled by defult on the 3560 that would do this?
Thanks, hope that makes sense
11-03-2011 08:51 AM
Hi,
Can you post 3560 config and explain exactly what is happening in this VLAN 129.
Regards.
Alain.
11-03-2011 09:00 AM
Hi, check both 3560 and 6509 trunk configurations, don't forget the encapsulation, because on 2950 when configuring the trunk, we don't specify the encapsulation,and on 3560, you need to specify it,
if you can only post the both switch trunk configurations
11-03-2011 09:25 AM
I have checked both sides, switch trunk encapsulation dot1q is setup.
Thanks
---------------------------------------------------------------------------------------------------------------------------------
Here is an output of the 2950: (WORKING)
cat2950a>en
Password:
cat2950a#sh run
Building configuration...
Current configuration : 9416 bytes
!
! Last configuration change at 10:07:30 CENTRAL Thu Nov 3 2011 by
!
version 12.1
no service pad
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname cat2950a
!
aaa new-model
aaa authentication login default line
aaa authentication login radius-logins group radius line
enable secret 5
!
clock timezone CENTRAL -6
clock summer-time CENTRAL_DST recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
ip subnet-zero
no ip domain-lookup
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
interface FastEthernet0/1
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/2
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/3
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/4
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/5
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/6
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/7
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/8
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/9
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/10
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/11
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/12
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/13
switchport access vlan 129
switchport mode access
no ip address
duplex half
speed 10
spanning-tree portfast
!
interface FastEthernet0/14
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/15
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/16
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/17
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/18
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/19
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/20
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/21
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/22
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/23
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/24
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/25
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/26
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/27
switchport access vlan 129
switchport mode access
no ip address
duplex full
speed 100
spanning-tree portfast
!
interface FastEthernet0/28
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/29
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/30
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/31
description video monitoring pharm
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/32
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/33
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/34
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/35
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/36
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/37
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/38
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/39
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/40
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/41
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/42
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/43
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/44
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/45
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/46
switchport access vlan 129
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/47
switchport access vlan 404
switchport mode access
no ip address
spanning-tree portfast
!
interface FastEthernet0/48
description Network UPS
switchport access vlan 500
switchport mode access
no ip address
duplex half
speed 10
spanning-tree portfast
!
interface GigabitEthernet0/1
switchport trunk native vlan 500
switchport trunk allowed vlan 129,404,500
switchport mode trunk
switchport nonegotiate
no ip address
!
interface GigabitEthernet0/2
switchport trunk native vlan 500
switchport trunk allowed vlan 129,404,500
switchport mode trunk
switchport nonegotiate
no ip address
!
interface Vlan1
no ip address
no ip route-cache
shutdown
!
interface Vlan500
ip address 172.18.77.18 255.255.255.0
no ip route-cache
!
ip default-gateway 172.18.77.1
no ip http server
---------------------------------------------------------------------------------------------------------------------------------
Here is the ouput of the 3560: (NOT WORKING)
c3560g#sh run
Building configuration...
Current configuration : 9275 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
service password-encryption
!
hostname c3560g
!
enable secret 5
!
aaa new-model
aaa authentication login default line
aaa authentication login radius-logins group radius line
!
aaa session-id common
clock timezone CST -6
clock summer-time CDT recurring
system mtu routing 1500
ip subnet-zero
no ip domain-lookup
!
!
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
interface GigabitEthernet0/1
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/2
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/3
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/4
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/5
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/6
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/7
switchport access vlan 129
switchport mode access
speed 100
duplex full
!
interface GigabitEthernet0/8
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/9
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/10
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/11
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/12
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/13
switchport access vlan 129
switchport mode access
speed 10
duplex half
spanning-tree portfast
!
interface GigabitEthernet0/14
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/15
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/16
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/17
switchport access vlan 129
switchport mode access
speed 100
duplex full
spanning-tree portfast
!
interface GigabitEthernet0/18
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/19
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/20
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/21
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/22
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/23
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/24
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/25
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/26
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/27
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/28
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/29
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/30
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/31
description special video monitoring pharmacy
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/32
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/33
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/34
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/35
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/36
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/37
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/38
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/39
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/40
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/41
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/42
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/43
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/44
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/45
switchport access vlan 129
switchport mode access
shutdown
spanning-tree portfast
!
interface GigabitEthernet0/46
description ap-craniofacial
switchport access vlan 701
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/47
description privprac-WHC
switchport access vlan 404
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/48
switchport access vlan 129
switchport mode access
spanning-tree portfast
!
interface GigabitEthernet0/49
description dista
switchport trunk encapsulation dot1q
switchport trunk native vlan 500
switchport trunk allowed vlan 129,404,500
switchport mode trunk
switchport nonegotiate
!
interface GigabitEthernet0/50
description cat2950b
switchport trunk encapsulation dot1q
switchport trunk native vlan 500
switchport trunk allowed vlan 129,404,500
switchport mode trunk
switchport nonegotiate
!
interface GigabitEthernet0/51
!
interface GigabitEthernet0/52
!
interface Vlan1
no ip address
shutdown
!
interface Vlan500
ip address 172.18.77.18 255.255.255.0
no ip route-cache
!
ip default-gateway 172.18.77.1
ip classless
no ip http server
!
l
11-03-2011 09:42 AM
Hi,
can you try clearing the arp cach on the ASA.
Alain.
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