I had a straight through long haul fiber connection from my 6509 to a 3750 provided by Charter.
That has changed now to a ATT OPT-E-MAN fiber connection using their Cisco ME3400 switches on both
ends with twist pair cable connections from them to my 6509 and to a 3560 on the remote end. The
new fiber connection comes into the remote building where we had a 3560 that has fiber connection to
the 3750 used for the Charter fiber connection. With the new fiber connection not all the devices on the
3750 are able to find the gateway IP address 10.4.1.254 that I have set on the 6509. All the devices on
the 3560 that is directly attached to the Cisco ME3400 work. I have reset the 3750 and 3560 and the
computers that are not working. When I switch back to the old Charter straight through fiber connection
everything works. The next time I disconnect the old Charter fiber connection from the 3750 and
connect the new fiber to the 3560 different computer are not working now and other computers that
were working are now working. I am not able to ping the gateway 10.4.1.254 that is on the 6509 from
the computers not working when on the new fiber connection.
Old Fiber connection
6509---long haul fiber------3750--- Multi Mode fiber ---3560
New Fiber connection
6509---TP cable---ME3400-----fiber------ME3400----TP cable----3560---fiber----3750
Old Charter Fiber Configuration working
6509 fiber connection to 3750
interface GigabitEthernet5/15
switchport
switchport access vlan 4
switchport trunk encapsulation isl
switchport trunk allowed vlan 1-4,7,9,11,15
switchport mode trunk
spanning-tree bpdufilter enable
spanning-tree bpduguard enable
interface Vlan4 on 6509 serves as the gateway for VLAN 4 computers
ip address 10.4.1.254 255.255.0.0
ip helper-address 10.3.1.8
ip helper-address 10.3.1.9
ip pim dense-mode
ip route-cache flow
3750 fiber connection to 6509
interface GigabitEthernet1/0/52
switchport trunk encapsulation isl
switchport mode trunk
interface Vlan1
ip address 10.11.2.1 255.255.0.0
no ip route-cache
!
interface Vlan4
no ip address
no ip route-cache
!
ip default-gateway 10.11.1.254
Ports 1-48 on 3750 configured the same
switchport access vlan 4
switchport mode access
spanning-tree portfast
New ATT fiber configuration not working
6509 CAT5 TP connection to ATT OPT-e-MAN ME3400 switch
interface GigabitEthernet7/38
no keepalive
speed 100
duplex full
switchport
switchport access vlan 4
switchport trunk allowed vlan 1-4,7,9,11
switchport mode trunk
3560 CAT5 TP connection to ATT OPT-e-MAN ME3400 switch
interface FastEthernet0/24
description Court House 6509
switchport access vlan 4
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
no keepalive
duplex full
speed 100
!
3560 fiber connection to 3750
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
rmon collection stats 11 owner monitor
!
interface Vlan1
ip address 10.11.4.1 255.255.0.0
!
interface Vlan4
no ip address
ip helper-address 10.3.1.8
ip helper-address 10.3.1.9
!
ip default-gateway 10.11.1.254
Ports 1-23 on 3560 configured the same
switchport access vlan 4
switchport mode access
spanning-tree portfast