3550 Trunking/Duplex, Speed issue

[outback]

We currently have two 3550G. 3550 A is our main production and 3550 B is our lab. On 3550 A we have the first four GBIC slots full and the last two 10/100/1000 slots full. The two are trunked together running in the
same VTP domain. 3550 A is a VTP server and 3550B is a VTP client. We have a 2950 trunking off 3550 B that we would like to move up and have it trunk off the 3550 A. Every time we move that trunk up to 3550 A we are unable to pass any data through the trunk. Were using the same encapsulation, trunking is turned on, and when you look at the trunk stat all vlans are allowed. The other odd thing is when you look at the interface status, the gbic put into any slot left on the 3550 A will not either negotiate duplex right of speed right.

Any ideas would be greatly appreciated

 

[baddos]

Please post the configs.

 

[jgercken]

A show cdp neigh will often indicate the problem. Is your management vlan the same?
-Jeff ----------------------------------------
Wasabi Pop Tarts! Write Kellogs today!

 

[outback]

Thanks for the responses. I have been working w/cisco's TAC and they to were questioning CDP as well. I had it turned off on the 3550 A the one in question. I did reenable cdp and still no further response. For some reason the last four GBIC slots will not negotiate proper duplex or speed. I can't say for sure this is the problem but I would have to thing it's defiantly not helping me.

I will keep you posted if I hear any more from TAC.

the following are the config

Current configuration : 4375 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3550 A
!
enable secret .
!
ip subnet-zero
ip routing
no ip finger
cluster enable Qmedtrix_PDX 0
cluster member 1 mac-address 0008.a360.cf00
cluster member 2 mac-address 0008.a360.d100
!
!
no spanning-tree vlan 3
!
--More--  !
!
interface GigabitEthernet0/1
description "Trunk to asw_xxx1-12"
switchport trunk encapsulation isl
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/2
description "Trunk to asw_xxx2-12"
switchport trunk encapsulation isl
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/3
description "Trunk to asw_xxx3-12"
switchport trunk encapsulation isl
switchport mode trunk
no ip address
--More--   snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/4
description "Trunk to asw_xxx4-12"
switchport trunk encapsulation isl
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/5
description "Trunk to asw_xxx5-4"
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/6
description "trunk to Basement"
switchport access vlan 192
switchport trunk encapsulation isl
--More--   switchport trunk allowed vlan 1,53-1005
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/7
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/8
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/9
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
--More--   snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/10
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/11
description "Trunk between DSW'S"
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
snmp trap link-status
no cdp enable
!
interface GigabitEthernet0/12
no ip address
snmp trap link-status
no cdp enable
!
interface Vlan1
ip address x.x.x.x x.x.x.x
--More--  !
interface Vlan2
ip address x.x.x.x x.x.x.x
!
interface Vlan3
no ip address
!
interface Vlan4
ip address x.x.x.x x.x.x.x
ip helper-address x.x.x.x
!
interface Vlan6
ip address x.x.x.x x.x.x.x
ip helper-address x.x.x.x
!
interface Vlan8
ip address x.x.x.x x.x.x.x
ip helper-address x.x.x.x
!
interface Vlan10
ip address x.x.x.x x.x.x.x
ip access-group Remote-Connection in
!
--More--  interface Vlan12
no ip address
!
interface Vlan50
no ip address
!
interface Vlan51
ip address x.x.x.x x.x.x.x
!
interface Vlan192
ip address x.x.x.x x.x.x.x
!
interface Vlan258
ip address x.x.x.x x.x.x.x
ip helper-address x.x.x.x
!
router eigrp 2
passive-interface Vlan2
passive-interface Vlan4
passive-interface Vlan6
passive-interface Vlan8
passive-interface Vlan51
network x.x.x.x
--More--   network x.x.x.x
network x.x.x.x
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
no ip forward-protocol udp netbios-ns
no ip forward-protocol udp netbios-dgm
ip route 0.0.0.0 0.0.0.0 x.x.x.x
no ip http server
!
!
logging trap warnings
logging x.x.x.x
access-list 3 permit x.x.x.x
--More--  access-list 3 permit 10.25.0.1
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
!
line con 0
transport input none
line vty 0 4
access-class 3 in
password
login
line vty 5 15
login
!
end
3550 A#sh cdp neigh
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater

Device ID Local Intrfce Holdtme Capability Platform Port ID
3550 A#


Config # 2 to compare other 3550

sh run
Building configuration...

Current configuration : 2525 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3550 B
!
enable secret
!
ip subnet-zero
ip routing
!
spanning-tree extend system-id
!
!
!
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-25,28-1005
--More--   switchport mode trunk
no ip address
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
!
interface GigabitEthernet0/3
no ip address
!
interface GigabitEthernet0/4
no ip address
!
interface GigabitEthernet0/5
no ip address
!
interface GigabitEthernet0/6
no ip address
!
interface GigabitEthernet0/7
no ip address
!
--More--  interface GigabitEthernet0/8
no ip address
!
interface GigabitEthernet0/9
no ip address
!
interface GigabitEthernet0/10
no ip address
!
interface GigabitEthernet0/11
description "Trunk between DSW'S"
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
!
interface GigabitEthernet0/12
switchport access vlan 50
no ip address
!
interface Vlan1
ip address x.x.x.x x.x.x.x
!
interface Vlan2
--More--   no ip address
!
interface Vlan4
no ip address
!
interface Vlan6
no ip address
!
interface Vlan8
no ip address
!
interface Vlan25
ip address x.x.x.x x.x.x.x
!
interface Vlan27
ip address x.x.x.x x.x.x.x
!
interface Vlan50
no ip address
shutdown
!
interface Vlan51
no ip address
--More--  !
interface Vlan258
ip address x.x.x.x x.x.x.x
ip helper-address x.x.x.x
!
router eigrp 2
passive-interface Vlan25
passive-interface Vlan27
passive-interface Vlan258
network x.x.x.x
network x.x.x.x
network x.x.x.x
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 x.x.x.x
no ip http server
!
logging x.x.x.x
access-list 3 permit x.x.x.x
--More--  access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
access-list 3 permit x.x.x.x
snmp-server engineID local 8000000903000009B79CB701
snmp-server community public RO
banner motd ^C
Property of Qmedtrix Systems Inc., Authorized personel ONLY!
^C
!
line con 0
line vty 0 4
access-class 3 in
password
login
line vty 5 15
login
!
end
--More--  
3550 B#sh cdp neigh
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater

Device ID Local Intrfce Holdtme Capability Platform Port ID
PDX_ASW_SRV Gig 0/2 160 S I WS-C2950G-Gig 0/1
3550 B#

 

[baddos]

It Switch B plugged into Switch A port 6?

interface GigabitEthernet0/6
description "trunk to Basement"
switchport access vlan 192
switchport trunk encapsulation isl
--More--   switchport trunk allowed vlan 1,53-1005

This interface is missing the switchport mode trunk.

 

[outback]

no, actually the 3550's are trunk together using g0/11 on both switches

 

[baddos]

On switch A do this:

interface GigabitEthernet0/11
cdp enable
exit
exit

show cdp neighbors